diff --git a/ape/ape-m1.c b/ape/ape-m1.c
index ba07d178d..6db098e53 100644
--- a/ape/ape-m1.c
+++ b/ape/ape-m1.c
@@ -68,6 +68,16 @@ struct Syslib {
   int (*pthread_attr_destroy)(pthread_attr_t *);
   int (*pthread_attr_setstacksize)(pthread_attr_t *, size_t);
   int (*pthread_attr_setguardsize)(pthread_attr_t *, size_t);
+  /* v4 (2023-09-19) */
+  void (*exit)(int);
+  long (*close)(int);
+  long (*munmap)(void *, size_t);
+  long (*openat)(int, const char *, int, int);
+  long (*write)(int, const void *, size_t);
+  long (*read)(int, void *, size_t);
+  long (*sigaction)(int, const struct sigaction *, struct sigaction *);
+  long (*pselect)(int, fd_set *, fd_set *, fd_set *, const struct timespec *, const sigset_t *);
+  long (*mprotect)(void *, size_t, int);
 };
 
 #define ELFCLASS32  1
@@ -792,14 +802,38 @@ static long sys_fork(void) {
   return sysret(fork());
 }
 
+static long sys_close(int fd) {
+  return sysret(close(fd));
+}
+
 static long sys_pipe(int pfds[2]) {
   return sysret(pipe(pfds));
 }
 
+static long sys_munmap(void *addr, size_t size) {
+  return sysret(munmap(addr, size));
+}
+
+static long sys_read(int fd, void *data, size_t size) {
+  return sysret(read(fd, data, size));
+}
+
+static long sys_mprotect(void *data, size_t size, int prot) {
+  return sysret(mprotect(data, size, prot));
+}
+
+static long sys_write(int fd, const void *data, size_t size) {
+  return sysret(write(fd, data, size));
+}
+
 static long sys_clock_gettime(int clock, struct timespec *ts) {
   return sysret(clock_gettime((clockid_t)clock, ts));
 }
 
+static long sys_openat(int fd, const char *path, int flags, int mode) {
+  return sysret(openat(fd, path, flags, mode));
+}
+
 static long sys_nanosleep(const struct timespec *req, struct timespec *rem) {
   return sysret(nanosleep(req, rem));
 }
@@ -809,6 +843,15 @@ static long sys_mmap(void *addr, size_t size, int prot, int flags, int fd,
   return sysret((long)mmap(addr, size, prot, flags, fd, off));
 }
 
+static long sys_sigaction(int sig, const struct sigaction *act, struct sigaction *oact) {
+  return sysret(sigaction(sig, act, oact));
+}
+
+static long sys_pselect(int nfds, fd_set *readfds, fd_set *writefds, fd_set *errorfds,
+                        const struct timespec *timeout, const sigset_t *sigmask) {
+  return sysret(pselect(nfds, readfds, writefds, errorfds, timeout, sigmask));
+}
+
 int main(int argc, char **argv, char **envp) {
   unsigned i;
   int c, n, fd, rc;
@@ -852,6 +895,15 @@ int main(int argc, char **argv, char **envp) {
   M->lib.pthread_attr_destroy = pthread_attr_destroy;
   M->lib.pthread_attr_setstacksize = pthread_attr_setstacksize;
   M->lib.pthread_attr_setguardsize = pthread_attr_setguardsize;
+  M->lib.exit = exit;
+  M->lib.close = sys_close;
+  M->lib.munmap = sys_munmap;
+  M->lib.openat = sys_openat;
+  M->lib.write = sys_write;
+  M->lib.read = sys_read;
+  M->lib.sigaction = sys_sigaction;
+  M->lib.pselect = sys_pselect;
+  M->lib.mprotect = sys_mprotect;
 
   /* getenv("_") is close enough to at_execfn */
   execfn = argc > 0 ? argv[0] : 0;
diff --git a/build/definitions.mk b/build/definitions.mk
index 450e98dd0..21552bc23 100644
--- a/build/definitions.mk
+++ b/build/definitions.mk
@@ -86,7 +86,7 @@ IGNORE := $(shell $(MKDIR) $(TMPDIR))
 
 ifneq ($(findstring aarch64,$(MODE)),)
 ARCH = aarch64
-HOSTS ?= pi silicon-wifi
+HOSTS ?= pi silicon
 else
 ARCH = x86_64
 HOSTS ?= freebsd rhel7 rhel5 xnu win10 openbsd netbsd
diff --git a/build/online.mk b/build/online.mk
index ffe5d6b86..ce84893b9 100644
--- a/build/online.mk
+++ b/build/online.mk
@@ -28,7 +28,7 @@ o/$(MODE)/%.com.ok:				\
 		o/$(MODE)/tool/build/runit.com	\
 		o/$(MODE)/tool/build/runitd.com	\
 		o/$(MODE)/%.com
-	$(COMPILE) -wATEST -tT$@ $^ $(HOSTS)
+	@$(COMPILE) -wATEST -tT$@ $^ $(HOSTS)
 
 .PHONY:
 o/tiny/tool/build/runit.com:
diff --git a/examples/ttyinfo.c b/examples/ttyinfo.c
index 50b7c77e6..8672aecdb 100644
--- a/examples/ttyinfo.c
+++ b/examples/ttyinfo.c
@@ -8,14 +8,17 @@
 ╚─────────────────────────────────────────────────────────────────*/
 #endif
 #include "dsp/tty/tty.h"
+#include "libc/assert.h"
 #include "libc/calls/calls.h"
+#include "libc/calls/internal.h"
 #include "libc/calls/struct/sigaction.h"
+#include "libc/calls/struct/sigset.h"
 #include "libc/calls/termios.h"
 #include "libc/errno.h"
 #include "libc/fmt/fmt.h"
+#include "libc/intrin/kprintf.h"
 #include "libc/log/check.h"
 #include "libc/log/log.h"
-#include "libc/nt/runtime.h"
 #include "libc/runtime/runtime.h"
 #include "libc/sock/select.h"
 #include "libc/stdio/dprintf.h"
@@ -36,29 +39,30 @@
 #define PROBE_DISPLAY_SIZE     "\e7\e[9979;9979H\e[6n\e8"
 
 char code[512];
+int infd, outfd;
 struct winsize wsize;
 struct termios oldterm;
 volatile bool resized, killed;
 
-void onresize(void) {
+void OnResize(int sig) {
   resized = true;
 }
 
-void onkilled(int sig) {
+void OnKilled(int sig) {
   killed = true;
 }
 
-void restoretty(void) {
-  WRITE(1, DISABLE_MOUSE_TRACKING);
-  tcsetattr(1, TCSANOW, &oldterm);
+void RestoreTty(void) {
+  WRITE(outfd, DISABLE_MOUSE_TRACKING);
+  tcsetattr(outfd, TCSANOW, &oldterm);
 }
 
-int rawmode(void) {
+int EnableRawMode(void) {
   static bool once;
   struct termios t;
   if (!once) {
-    if (!tcgetattr(1, &oldterm)) {
-      atexit(restoretty);
+    if (!tcgetattr(outfd, &oldterm)) {
+      atexit(RestoreTty);
     } else {
       perror("tcgetattr");
     }
@@ -78,26 +82,26 @@ int rawmode(void) {
 
   t.c_iflag &= ~(INPCK | ISTRIP | PARMRK | INLCR | IGNCR | ICRNL | IXON |
                  IGNBRK | BRKINT);
-  t.c_lflag &= ~(IEXTEN | ICANON | ECHO | ECHONL | ISIG);
+  t.c_lflag &= ~(IEXTEN | ICANON | ECHO | ECHONL /* | ISIG */);
   t.c_cflag &= ~(CSIZE | PARENB);
   t.c_oflag |= OPOST | ONLCR;
   t.c_cflag |= CS8;
   t.c_iflag |= IUTF8;
 
-  if (tcsetattr(1, TCSANOW, &t)) {
+  if (tcsetattr(outfd, TCSANOW, &t)) {
     perror("tcsetattr");
   }
 
-  /* WRITE(1, ENABLE_SAFE_PASTE); */
-  /* WRITE(1, ENABLE_MOUSE_TRACKING); */
-  /* WRITE(1, PROBE_DISPLAY_SIZE); */
+  WRITE(outfd, ENABLE_MOUSE_TRACKING);
+  /* WRITE(outfd, ENABLE_SAFE_PASTE); */
+  /* WRITE(outfd, PROBE_DISPLAY_SIZE); */
   return 0;
 }
 
-void getsize(void) {
-  if (tcgetwinsize(1, &wsize) != -1) {
-    printf("termios says terminal size is %hu×%hu\r\n", wsize.ws_col,
-           wsize.ws_row);
+void GetTtySize(void) {
+  if (tcgetwinsize(outfd, &wsize) != -1) {
+    dprintf(outfd, "termios says terminal size is %hu×%hu\r\n", wsize.ws_col,
+            wsize.ws_row);
   } else {
     perror("tcgetwinsize");
   }
@@ -144,50 +148,63 @@ const char *describemouseevent(int e) {
 // change the code above to enable ISIG if you want to trigger this
 // then press ctrl-c or ctrl-\ in your pseudoteletypewriter console
 void OnSignalThatWontEintrRead(int sig) {
-  dprintf(1, "got %s (read()ing will SA_RESTART)\n", strsignal(sig));
+  dprintf(outfd, "got %s (read()ing will SA_RESTART; try CTRL-D to exit)\n",
+          strsignal(sig));
+}
+
+void OnSignalThatWillEintrRead(int sig) {
+  dprintf(outfd, "got %s (read() operation will be aborted)\n", strsignal(sig));
 }
 
 int main(int argc, char *argv[]) {
   int e, c, y, x, n, yn, xn;
+  infd = 0;
+  outfd = 1;
+  /* infd = outfd = open("/dev/tty", O_RDWR); */
+  signal(SIGTERM, OnKilled);
+  signal(SIGCONT, OnResize);
+  signal(SIGWINCH, OnResize);
   signal(SIGINT, OnSignalThatWontEintrRead);
-  signal(SIGQUIT, OnSignalThatWontEintrRead);
-  xsigaction(SIGTERM, onkilled, 0, 0, NULL);
-  xsigaction(SIGWINCH, onresize, 0, 0, NULL);
-  xsigaction(SIGCONT, onresize, 0, 0, NULL);
-  rawmode();
-  getsize();
+  sigaction(SIGQUIT,
+            &(struct sigaction){.sa_handler = OnSignalThatWillEintrRead}, 0);
+  EnableRawMode();
+  GetTtySize();
   while (!killed) {
     if (resized) {
-      printf("SIGWINCH ");
-      getsize();
+      dprintf(outfd, "SIGWINCH ");
+      GetTtySize();
       resized = false;
     }
     bzero(code, sizeof(code));
-    if ((n = readansi(0, code, sizeof(code))) == -1) {
-      if (errno == EINTR) continue;
+    if ((n = read(infd, code, sizeof(code))) == -1) {
+      if (errno == EINTR) {
+        dprintf(outfd, "read() was interrupted\n");
+        continue;
+      }
       perror("read");
       exit(1);
     }
     if (!n) {
-      printf("got stdin eof\n");
+      dprintf(outfd, "got stdin eof\n");
       exit(0);
     }
-    printf("%`'.*s (got %d) ", n, code, n);
+    dprintf(outfd, "%`'.*s (got %d) ", n, code, n);
     if (iscntrl(code[0]) && !code[1]) {
-      printf("is CTRL-%c a.k.a. ^%c\r\n", CTRL(code[0]), CTRL(code[0]));
+      dprintf(outfd, "is CTRL-%c a.k.a. ^%c\r\n", CTRL(code[0]), CTRL(code[0]));
       if (code[0] == CTRL('C') || code[0] == CTRL('D')) break;
     } else if (startswith(code, "\e[") && endswith(code, "R")) {
       yn = 1, xn = 1;
       sscanf(code, "\e[%d;%dR", &yn, &xn);
-      printf("inband signalling says terminal size is %d×%d\r\n", xn, yn);
+      dprintf(outfd, "inband signalling says terminal size is %d×%d\r\n", xn,
+              yn);
     } else if (startswith(code, "\e[<") &&
                (endswith(code, "m") || endswith(code, "M"))) {
       e = 0, y = 1, x = 1;
       sscanf(code, "\e[<%d;%d;%d%c", &e, &y, &x, &c);
-      printf("mouse %s at %d×%d\r\n", describemouseevent(e | (c == 'm') << 2),
-             x, y);
+      dprintf(outfd, "mouse %s at %d×%d\r\n",
+              describemouseevent(e | (c == 'm') << 2), x, y);
     } else {
-      printf("\r\n");
+      dprintf(outfd, "\r\n");
     }
   }
   return 0;
diff --git a/libc/calls/console.internal.h b/libc/calls/console.internal.h
deleted file mode 100644
index f4344682f..000000000
--- a/libc/calls/console.internal.h
+++ /dev/null
@@ -1,14 +0,0 @@
-#ifndef COSMOPOLITAN_LIBC_CALLS_CONSOLE_INTERNAL_H_
-#define COSMOPOLITAN_LIBC_CALLS_CONSOLE_INTERNAL_H_
-#include "libc/calls/struct/fd.internal.h"
-#include "libc/nt/struct/inputrecord.h"
-#if !(__ASSEMBLER__ + __LINKER__ + 0)
-COSMOPOLITAN_C_START_
-
-int CountConsoleInputBytes(int64_t);
-int ConvertConsoleInputToAnsi(const struct NtInputRecord *, char[hasatleast 32],
-                              uint16_t *, struct Fd *);
-
-COSMOPOLITAN_C_END_
-#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
-#endif /* COSMOPOLITAN_LIBC_CALLS_CONSOLE_INTERNAL_H_ */
diff --git a/libc/calls/fstatfs.c b/libc/calls/fstatfs.c
index f29def020..a9cfcb7b2 100644
--- a/libc/calls/fstatfs.c
+++ b/libc/calls/fstatfs.c
@@ -59,3 +59,5 @@ int fstatfs(int fd, struct statfs *sf) {
   STRACE("fstatfs(%d, [%s]) → %d% m", fd, DescribeStatfs(rc, sf));
   return rc;
 }
+
+__weak_reference(fstatfs, fstatfs64);
diff --git a/libc/calls/getrlimit.c b/libc/calls/getrlimit.c
index 54f66935c..de1c84668 100644
--- a/libc/calls/getrlimit.c
+++ b/libc/calls/getrlimit.c
@@ -57,3 +57,5 @@ int getrlimit(int resource, struct rlimit *rlim) {
          DescribeRlimit(rc, rlim), rc);
   return rc;
 }
+
+__weak_reference(getrlimit, getrlimit64);
diff --git a/libc/calls/internal.h b/libc/calls/internal.h
index 5d9651c46..38f2b7e00 100644
--- a/libc/calls/internal.h
+++ b/libc/calls/internal.h
@@ -25,6 +25,9 @@ int __ensurefds(int);
 int __ensurefds_unlocked(int);
 void __printfds(void);
 uint32_t sys_getuid_nt(void);
+int __pause_thread(uint32_t);
+int CountConsoleInputBytes(int64_t);
+int FlushConsoleInputBytes(int64_t);
 
 forceinline int64_t __getfdhandleactual(int fd) {
   return g_fds.p[fd].handle;
diff --git a/libc/calls/interrupts-nt.c b/libc/calls/interrupts-nt.c
index ae89b7123..618f7dcee 100644
--- a/libc/calls/interrupts-nt.c
+++ b/libc/calls/interrupts-nt.c
@@ -19,6 +19,7 @@
 #include "libc/calls/internal.h"
 #include "libc/calls/sig.internal.h"
 #include "libc/errno.h"
+#include "libc/intrin/strace.internal.h"
 #include "libc/intrin/weaken.h"
 #include "libc/sysv/errfuns.h"
 #include "libc/thread/posixthread.internal.h"
@@ -33,7 +34,9 @@ textwindows int _check_interrupts(int sigops) {
     goto Interrupted;
   }
   if (_weaken(__sig_check) && (status = _weaken(__sig_check)())) {
+    STRACE("syscall interrupted (status=%d, sigops=%d)", status, sigops);
     if (status == 2 && (sigops & kSigOpRestartable)) {
+      STRACE("restarting system call");
       return 0;
     }
     err = EINTR;
diff --git a/libc/calls/ioctl.c b/libc/calls/ioctl.c
index cb67b658a..d2dab5cfa 100644
--- a/libc/calls/ioctl.c
+++ b/libc/calls/ioctl.c
@@ -17,7 +17,6 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/assert.h"
-#include "libc/calls/console.internal.h"
 #include "libc/calls/internal.h"
 #include "libc/calls/struct/fd.internal.h"
 #include "libc/calls/syscall-sysv.internal.h"
@@ -91,10 +90,9 @@ static int ioctl_default(int fd, unsigned long request, void *arg) {
 }
 
 static int ioctl_fionread(int fd, uint32_t *arg) {
+  int rc;
   uint32_t cm;
   int64_t handle;
-  uint32_t avail;
-  int rc, e = errno;
   if (!IsWindows()) {
     return sys_ioctl(fd, FIONREAD, arg);
   } else if (__isfdopen(fd)) {
@@ -106,19 +104,18 @@ static int ioctl_fionread(int fd, uint32_t *arg) {
         return _weaken(__winsockerr)();
       }
     } else if (GetFileType(handle) == kNtFileTypePipe) {
+      uint32_t avail;
       if (PeekNamedPipe(handle, 0, 0, 0, &avail, 0)) {
         *arg = avail;
         return 0;
+      } else if (GetLastError() == kNtErrorBrokenPipe) {
+        return 0;
       } else {
         return __winerr();
       }
     } else if (GetConsoleMode(handle, &cm)) {
-      avail = CountConsoleInputBytes(handle);
-      if (avail == -1u && errno == ENODATA) {
-        errno = e;
-        avail = 0;
-      }
-      return avail;
+      int bytes = CountConsoleInputBytes(handle);
+      return MAX(0, bytes);
     } else {
       return eopnotsupp();
     }
diff --git a/libc/calls/open-nt.c b/libc/calls/open-nt.c
index 40ed5551c..612a04f10 100644
--- a/libc/calls/open-nt.c
+++ b/libc/calls/open-nt.c
@@ -144,33 +144,13 @@ static textwindows int sys_open_nt_console(int dirfd,
                                            const struct NtMagicPaths *mp,
                                            uint32_t flags, int32_t mode,
                                            size_t fd) {
-  uint32_t cm;
-  int input, output;
-  if ((__isfdopen((input = STDIN_FILENO)) &&
-       GetConsoleMode(g_fds.p[input].handle, &cm)) &&
-      ((__isfdopen((output = STDOUT_FILENO)) &&
-        GetConsoleMode(g_fds.p[output].handle, &cm)) ||
-       (__isfdopen((output = STDERR_FILENO)) &&
-        GetConsoleMode(g_fds.p[output].handle, &cm)))) {
-    // this is an ugly hack that works for observed usage patterns
-    g_fds.p[fd].handle = g_fds.p[input].handle;
-    g_fds.p[fd].extra = g_fds.p[output].handle;
-    g_fds.p[fd].dontclose = true;
-    g_fds.p[input].dontclose = true;
-    g_fds.p[output].dontclose = true;
-  } else if ((g_fds.p[fd].handle = sys_open_nt_impl(
-                  dirfd, mp->conin, (flags & ~O_ACCMODE) | O_RDONLY, mode,
-                  kNtFileFlagOverlapped)) != -1) {
-    g_fds.p[fd].extra =
-        sys_open_nt_impl(dirfd, mp->conout, (flags & ~O_ACCMODE) | O_WRONLY,
-                         mode, kNtFileFlagOverlapped);
-    npassert(g_fds.p[fd].extra != -1);
-  } else {
-    return -1;
-  }
   g_fds.p[fd].kind = kFdConsole;
   g_fds.p[fd].flags = flags;
   g_fds.p[fd].mode = mode;
+  g_fds.p[fd].handle = CreateFile(u"CONIN$", kNtGenericRead | kNtGenericWrite,
+                                  kNtFileShareRead, 0, kNtOpenExisting, 0, 0);
+  g_fds.p[fd].extra = CreateFile(u"CONOUT$", kNtGenericRead | kNtGenericWrite,
+                                 kNtFileShareWrite, 0, kNtOpenExisting, 0, 0);
   return fd;
 }
 
diff --git a/libc/calls/overlap.h b/libc/calls/overlap.h
new file mode 100755
index 000000000..e69de29bb
diff --git a/libc/calls/overlapped.c b/libc/calls/overlapped.c
new file mode 100644
index 000000000..be311a243
--- /dev/null
+++ b/libc/calls/overlapped.c
@@ -0,0 +1,31 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2023 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/calls/overlap.h"
+#include "libc/calls/overlapped.internal.h"
+#include "libc/nt/files.h"
+#include "libc/nt/runtime.h"
+#include "libc/nt/thread.h"
+
+void overlapped_cleanup_callback(void *arg) {
+  uint32_t got;
+  struct OverlappedCleanup *cleanup = arg;
+  CancelIoEx(cleanup->handle, cleanup->overlap);
+  GetOverlappedResult(cleanup->handle, cleanup->overlap, &got, true);
+  CloseHandle(cleanup->overlap->hEvent);
+}
diff --git a/libc/calls/overlapped.internal.h b/libc/calls/overlapped.internal.h
new file mode 100644
index 000000000..a07ca7e48
--- /dev/null
+++ b/libc/calls/overlapped.internal.h
@@ -0,0 +1,25 @@
+#ifndef COSMOPOLITAN_LIBC_CALLS_OVERLAPPED_INTERNAL_H_
+#define COSMOPOLITAN_LIBC_CALLS_OVERLAPPED_INTERNAL_H_
+#include "libc/nt/struct/overlapped.h"
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+COSMOPOLITAN_C_START_
+
+#define overlapped_cleanup_push(handle, overlap)                     \
+  {                                                                  \
+    struct OverlappedCleanup overlapped_cleanup = {handle, overlap}; \
+    pthread_cleanup_push(overlapped_cleanup_callback, &overlapped_cleanup);
+
+#define overlapped_cleanup_pop() \
+  pthread_cleanup_pop(false);    \
+  }
+
+struct OverlappedCleanup {
+  int64_t handle;
+  struct NtOverlapped *overlap;
+};
+
+void overlapped_cleanup_callback(void *);
+
+COSMOPOLITAN_C_END_
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
+#endif /* COSMOPOLITAN_LIBC_CALLS_OVERLAPPED_INTERNAL_H_ */
diff --git a/libc/calls/pause-nt.c b/libc/calls/pause-nt.c
index 6db3a9292..5467c81d1 100644
--- a/libc/calls/pause-nt.c
+++ b/libc/calls/pause-nt.c
@@ -19,22 +19,11 @@
 #include "libc/calls/internal.h"
 #include "libc/calls/sig.internal.h"
 #include "libc/calls/syscall_support-nt.internal.h"
-#include "libc/errno.h"
-#include "libc/nt/synchronization.h"
-#include "libc/thread/posixthread.internal.h"
-#include "libc/thread/tls.h"
 
 textwindows int sys_pause_nt(void) {
   int rc;
   while (!(rc = _check_interrupts(0))) {
-    struct PosixThread *pt = _pthread_self();
-    pt->abort_errno = 0;
-    pt->pt_flags |= PT_INSEMAPHORE;
-    WaitForSingleObject(pt->semaphore, __SIG_SIG_INTERVAL_MS);
-    pt->pt_flags &= ~PT_INSEMAPHORE;
-    if (pt->abort_errno) {
-      errno = pt->abort_errno;
-      rc = -1;
+    if ((rc = __pause_thread(__SIG_SIG_INTERVAL_MS))) {
       break;
     }
   }
diff --git a/libc/calls/pause.c b/libc/calls/pause.c
index 406299537..597c4a49f 100644
--- a/libc/calls/pause.c
+++ b/libc/calls/pause.c
@@ -37,7 +37,9 @@
  *
  * However this has a tinier footprint and better logging.
  *
- * @return -1 w/ errno set to EINTR
+ * @return -1 w/ errno
+ * @raise ECANCELED if this thread was canceled in masked mode
+ * @raise EINTR if interrupted by a signal
  * @cancellationpoint
  * @see sigsuspend()
  * @norestart
diff --git a/libc/calls/fionread-nt.c b/libc/calls/pausethread.c
similarity index 68%
rename from libc/calls/fionread-nt.c
rename to libc/calls/pausethread.c
index 01bb33e62..673a37118 100644
--- a/libc/calls/fionread-nt.c
+++ b/libc/calls/pausethread.c
@@ -16,41 +16,21 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/assert.h"
 #include "libc/calls/calls.h"
-#include "libc/calls/console.internal.h"
-#include "libc/calls/struct/fd.internal.h"
-#include "libc/calls/syscall_support-nt.internal.h"
 #include "libc/errno.h"
-#include "libc/macros.internal.h"
-#include "libc/nt/console.h"
-#include "libc/nt/struct/inputrecord.h"
-#ifdef __x86_64__
+#include "libc/nt/synchronization.h"
+#include "libc/thread/posixthread.internal.h"
 
-int CountConsoleInputBytes(int64_t handle) {
-  char buf[32];
-  int rc, e = errno;
-  uint16_t utf16hs = 0;
-  uint32_t i, n, count;
-  struct NtInputRecord records[64];
-  if (PeekConsoleInput(handle, records, ARRAYLEN(records), &n)) {
-    for (rc = i = 0; i < n; ++i) {
-      count = ConvertConsoleInputToAnsi(records + i, buf, &utf16hs, 0);
-      if (count == -1) {
-        unassert(errno == ENODATA);
-        if (!rc) {
-          rc = -1;
-        } else {
-          errno = e;
-        }
-        break;
-      }
-      rc += count;
-    }
-  } else {
-    rc = __winerr();
+textwindows int __pause_thread(uint32_t ms) {
+  uint32_t status;
+  struct PosixThread *pt = _pthread_self();
+  pt->pt_flags |= PT_INSEMAPHORE;
+  status = WaitForSingleObject(pt->semaphore, ms);
+  if (status == -1u) notpossible;
+  if (!(pt->pt_flags & PT_INSEMAPHORE)) {
+    errno = pt->abort_errno;
+    return -1;
   }
-  return rc;
+  pt->pt_flags &= ~PT_INSEMAPHORE;
+  return 0;
 }
-
-#endif /* __x86_64__ */
diff --git a/libc/calls/pledge.c b/libc/calls/pledge.c
index f5a19f927..bcfd10f8f 100644
--- a/libc/calls/pledge.c
+++ b/libc/calls/pledge.c
@@ -35,7 +35,7 @@
  * Permits system operations, e.g.
  *
  *     __pledge_mode = PLEDGE_PENALTY_KILL_PROCESS | PLEDGE_STDERR_LOGGING;
- *     if (pledge("stdio rfile tty", 0)) {
+ *     if (pledge("stdio rpath tty", 0)) {
  *       perror("pledge");
  *       exit(1);
  *     }
diff --git a/libc/calls/poll-nt.c b/libc/calls/poll-nt.c
index 2e70adc07..563dcc36b 100644
--- a/libc/calls/poll-nt.c
+++ b/libc/calls/poll-nt.c
@@ -16,13 +16,16 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/assert.h"
 #include "libc/calls/calls.h"
-#include "libc/calls/console.internal.h"
 #include "libc/calls/internal.h"
 #include "libc/calls/sig.internal.h"
 #include "libc/calls/state.internal.h"
 #include "libc/calls/struct/sigaction.h"
+#include "libc/calls/struct/timespec.h"
+#include "libc/dce.h"
 #include "libc/errno.h"
+#include "libc/intrin/atomic.h"
 #include "libc/intrin/bits.h"
 #include "libc/intrin/strace.internal.h"
 #include "libc/macros.internal.h"
@@ -46,38 +49,37 @@
 #include "libc/sysv/consts/sig.h"
 #include "libc/sysv/errfuns.h"
 #include "libc/thread/posixthread.internal.h"
+#include "libc/thread/tls.h"
 
 #ifdef __x86_64__
 
-/*
- * Polls on the New Technology.
- *
- * This function is used to implement poll() and select(). You may poll
- * on both sockets and files at the same time. We also poll for signals
- * while poll is polling.
- */
-textwindows int sys_poll_nt(struct pollfd *fds, uint64_t nfds, uint64_t *ms,
+// Polls on the New Technology.
+//
+// This function is used to implement poll() and select(). You may poll
+// on both sockets and files at the same time. We also poll for signals
+// while poll is polling.
+textwindows int sys_poll_nt(struct pollfd *fds, uint64_t nfds, uint32_t *ms,
                             const sigset_t *sigmask) {
   bool ok;
+  uint64_t m;
+  bool interrupted;
   sigset_t oldmask;
-  uint32_t avail, cm;
+  uint32_t cm, avail, waitfor;
   struct sys_pollfd_nt pipefds[8];
   struct sys_pollfd_nt sockfds[64];
   int pipeindices[ARRAYLEN(pipefds)];
   int sockindices[ARRAYLEN(sockfds)];
-  int i, rc, sn, pn, gotinvals, gotpipes, gotsocks, waitfor;
+  int i, rc, sn, pn, gotinvals, gotpipes, gotsocks;
 
-  // check for interrupts early before doing work
-  if (sigmask) {
-    __sig_mask(SIG_SETMASK, sigmask, &oldmask);
-  }
-  if ((rc = _check_interrupts(0))) {
-    goto ReturnPath;
-  }
+#if IsModeDbg()
+  struct timespec noearlier =
+      timespec_add(timespec_real(), timespec_frommillis(ms ? *ms : -1u));
+#endif
 
   // do the planning
   // we need to read static variables
   // we might need to spawn threads and open pipes
+  m = atomic_exchange(&__get_tls()->tib_sigmask, -1);
   __fds_lock();
   for (gotinvals = rc = sn = pn = i = 0; i < nfds; ++i) {
     if (fds[i].fd < 0) continue;
@@ -125,9 +127,10 @@ textwindows int sys_poll_nt(struct pollfd *fds, uint64_t nfds, uint64_t *ms,
     }
   }
   __fds_unlock();
+  atomic_store_explicit(&__get_tls()->tib_sigmask, m, memory_order_release);
   if (rc) {
     // failed to create a polling solution
-    goto ReturnPath;
+    goto Finished;
   }
 
   // perform the i/o and sleeping and looping
@@ -152,17 +155,8 @@ textwindows int sys_poll_nt(struct pollfd *fds, uint64_t nfds, uint64_t *ms,
             pipefds[i].revents |= POLLERR;
           }
         } else if (GetConsoleMode(pipefds[i].handle, &cm)) {
-          int e = errno;
-          avail = CountConsoleInputBytes(pipefds[i].handle);
-          if (avail > 0) {
+          if (CountConsoleInputBytes(pipefds[i].handle)) {
             pipefds[i].revents |= POLLIN;
-          } else if (avail == -1u) {
-            if (errno == ENODATA) {
-              pipefds[i].revents |= POLLIN;
-            } else {
-              pipefds[i].revents |= POLLERR;
-            }
-            errno = e;
           }
         } else {
           // we have no way of polling if a non-socket is readable yet
@@ -176,42 +170,35 @@ textwindows int sys_poll_nt(struct pollfd *fds, uint64_t nfds, uint64_t *ms,
     }
     // if we haven't found any good results yet then here we
     // compute a small time slice we don't mind sleeping for
-    waitfor = gotinvals || gotpipes ? 0 : MIN(__SIG_POLL_INTERVAL_MS, *ms);
     if (sn) {
-#if _NTTRACE
-      POLLTRACE("WSAPoll(%p, %u, %'d) out of %'lu", sockfds, sn, waitfor, *ms);
-#endif
       if ((gotsocks = WSAPoll(sockfds, sn, 0)) == -1) {
-        rc = __winsockerr();
-        goto ReturnPath;
+        return __winsockerr();
       }
     } else {
       gotsocks = 0;
     }
+    waitfor = MIN(__SIG_POLL_INTERVAL_MS, *ms);
     if (!gotinvals && !gotsocks && !gotpipes && waitfor) {
-      POLLTRACE("sleeping for %'d out of %'lu ms", waitfor, *ms);
+      POLLTRACE("poll() sleeping for %'d out of %'u ms", waitfor, *ms);
       struct PosixThread *pt = _pthread_self();
       pt->abort_errno = 0;
-      pt->pt_flags |= PT_INSEMAPHORE;
-      WaitForSingleObject(pt->semaphore, waitfor);
-      pt->pt_flags &= ~PT_INSEMAPHORE;
-      if (pt->abort_errno) {
-        errno = pt->abort_errno;
-        rc = -1;
-        goto ReturnPath;
+      if (sigmask) __sig_mask(SIG_SETMASK, sigmask, &oldmask);
+      interrupted = _check_interrupts(0) || __pause_thread(waitfor);
+      if (sigmask) __sig_mask(SIG_SETMASK, &oldmask, 0);
+      if (interrupted) return -1;
+      if (*ms != -1u) {
+        if (waitfor < *ms) {
+          *ms -= waitfor;
+        } else {
+          *ms = 0;
+        }
       }
-      *ms -= waitfor;  // todo: make more resilient
     }
     // we gave all the sockets and all the named pipes a shot
     // if we found anything at all then it's time to end work
-    if (gotinvals || gotpipes || gotsocks || *ms <= 0) {
+    if (gotinvals || gotpipes || gotsocks || !*ms) {
       break;
     }
-    // otherwise loop limitlessly for timeout to elapse while
-    // checking for signal delivery interrupts, along the way
-    if ((rc = _check_interrupts(0))) {
-      goto ReturnPath;
-    }
   }
 
   // the system call is going to succeed
@@ -233,10 +220,16 @@ textwindows int sys_poll_nt(struct pollfd *fds, uint64_t nfds, uint64_t *ms,
   // and finally return
   rc = gotinvals + gotpipes + gotsocks;
 
-ReturnPath:
-  if (sigmask) {
-    __sig_mask(SIG_SETMASK, &oldmask, 0);
+Finished:
+
+#if IsModeDbg()
+  struct timespec ended = timespec_real();
+  if (!rc && timespec_cmp(ended, noearlier) < 0) {
+    STRACE("poll() ended %'ld ns too soon!",
+           timespec_tonanos(timespec_sub(noearlier, ended)));
   }
+#endif
+
   return rc;
 }
 
diff --git a/libc/calls/poll.c b/libc/calls/poll.c
index 8007533b4..c84a40aea 100644
--- a/libc/calls/poll.c
+++ b/libc/calls/poll.c
@@ -68,7 +68,6 @@
 int poll(struct pollfd *fds, size_t nfds, int timeout_ms) {
   int rc;
   size_t n;
-  uint64_t millis;
   BEGIN_CANCELLATION_POINT;
 
   if (IsAsan() &&
@@ -81,9 +80,9 @@ int poll(struct pollfd *fds, size_t nfds, int timeout_ms) {
       rc = sys_poll_metal(fds, nfds, timeout_ms);
     }
   } else {
-    millis = timeout_ms;
     BEGIN_BLOCKING_OPERATION;
-    rc = sys_poll_nt(fds, nfds, &millis, 0);
+    uint32_t ms = timeout_ms >= 0 ? timeout_ms : -1u;
+    rc = sys_poll_nt(fds, nfds, &ms, 0);
     END_BLOCKING_OPERATION;
   }
 
diff --git a/libc/calls/ppoll.c b/libc/calls/ppoll.c
index cd0f93f94..b5cebed28 100644
--- a/libc/calls/ppoll.c
+++ b/libc/calls/ppoll.c
@@ -64,7 +64,6 @@ int ppoll(struct pollfd *fds, size_t nfds, const struct timespec *timeout,
           const sigset_t *sigmask) {
   size_t n;
   int e, rc;
-  uint64_t millis;
   sigset_t oldmask;
   struct timespec ts, *tsp;
   BEGIN_CANCELLATION_POINT;
@@ -84,22 +83,24 @@ int ppoll(struct pollfd *fds, size_t nfds, const struct timespec *timeout,
     }
     rc = sys_ppoll(fds, nfds, tsp, sigmask, 8);
     if (rc == -1 && errno == ENOSYS) {
+      int ms;
       errno = e;
-      if (!timeout ||
-          ckd_add(&millis, timeout->tv_sec, timeout->tv_nsec / 1000000)) {
-        millis = -1;
+      if (!timeout || ckd_add(&ms, timeout->tv_sec,
+                              (timeout->tv_nsec + 999999) / 1000000)) {
+        ms = -1;
       }
       if (sigmask) sys_sigprocmask(SIG_SETMASK, sigmask, &oldmask);
-      rc = poll(fds, nfds, millis);
+      rc = poll(fds, nfds, ms);
       if (sigmask) sys_sigprocmask(SIG_SETMASK, &oldmask, 0);
     }
   } else {
+    uint32_t ms;
     if (!timeout ||
-        ckd_add(&millis, timeout->tv_sec, timeout->tv_nsec / 1000000)) {
-      millis = -1;
+        ckd_add(&ms, timeout->tv_sec, (timeout->tv_nsec + 999999) / 1000000)) {
+      ms = -1u;
     }
     BEGIN_BLOCKING_OPERATION;
-    rc = sys_poll_nt(fds, nfds, &millis, sigmask);
+    rc = sys_poll_nt(fds, nfds, &ms, sigmask);
     END_BLOCKING_OPERATION;
   }
 
diff --git a/libc/calls/read-nt.c b/libc/calls/read-nt.c
index 622d1132c..2efc7fb00 100644
--- a/libc/calls/read-nt.c
+++ b/libc/calls/read-nt.c
@@ -16,20 +16,18 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/calls/calls.h"
-#include "libc/calls/console.internal.h"
 #include "libc/calls/internal.h"
 #include "libc/calls/sig.internal.h"
-#include "libc/calls/state.internal.h"
 #include "libc/calls/struct/fd.internal.h"
 #include "libc/calls/struct/iovec.h"
-#include "libc/calls/struct/iovec.internal.h"
-#include "libc/calls/struct/timespec.h"
 #include "libc/calls/syscall_support-nt.internal.h"
-#include "libc/calls/wincrash.internal.h"
+#include "libc/calls/ttydefaults.h"
 #include "libc/errno.h"
 #include "libc/fmt/itoa.h"
+#include "libc/intrin/atomic.h"
+#include "libc/intrin/dll.h"
 #include "libc/intrin/nomultics.internal.h"
+#include "libc/intrin/strace.internal.h"
 #include "libc/intrin/weaken.h"
 #include "libc/macros.internal.h"
 #include "libc/nt/console.h"
@@ -39,95 +37,95 @@
 #include "libc/nt/errors.h"
 #include "libc/nt/events.h"
 #include "libc/nt/files.h"
-#include "libc/nt/ipc.h"
 #include "libc/nt/runtime.h"
 #include "libc/nt/struct/inputrecord.h"
-#include "libc/nt/struct/overlapped.h"
 #include "libc/nt/synchronization.h"
 #include "libc/nt/thread.h"
 #include "libc/nt/thunk/msabi.h"
 #include "libc/str/str.h"
 #include "libc/str/utf16.h"
 #include "libc/sysv/consts/o.h"
-#include "libc/sysv/consts/sa.h"
-#include "libc/sysv/consts/sicode.h"
 #include "libc/sysv/consts/sig.h"
 #include "libc/sysv/consts/termios.h"
 #include "libc/sysv/errfuns.h"
-#include "libc/thread/posixthread.internal.h"
+#include "libc/thread/thread.h"
 #include "libc/thread/tls.h"
-
 #ifdef __x86_64__
 
 __msabi extern typeof(CloseHandle) *const __imp_CloseHandle;
 
 static const struct {
-  uint16_t vk;
-  uint32_t normal_str;
-  uint32_t shift_str;
-  uint32_t ctrl_str;
-  uint32_t shift_ctrl_str;
+  int vk;
+  int normal_str;
+  int shift_str;
+  int ctrl_str;
+  int shift_ctrl_str;
 } kVirtualKey[] = {
-#define SW(s) W4(s "\0\0")
-#define W4(s) (s[3] + 0u) << 24 | s[2] << 16 | s[1] << 8 | s[0]
-#define VK(vk, normal_str, shift_str, ctrl_str, shift_ctrl_str) \
-  { vk, SW(normal_str), SW(shift_str), SW(ctrl_str), SW(shift_ctrl_str) }
-    VK(kNtVkInsert, "2~", "2;2~", "2;5~", "2;6~"),
-    VK(kNtVkEnd, "4~", "4;2~", "4;5~", "4;6~"),
-    VK(kNtVkDown, "B", "1;2B", "1;5B", "1;6B"),
-    VK(kNtVkNext, "6~", "6;2~", "6;5~", "6;6~"),
-    VK(kNtVkLeft, "D", "1;2D", "1;5D", "1;6D"),
-    VK(kNtVkClear, "G", "1;2G", "1;5G", "1;6G"),
-    VK(kNtVkRight, "C", "1;2C", "1;5C", "1;6C"),
-    VK(kNtVkUp, "A", "1;2A", "1;5A", "1;6A"),
-    VK(kNtVkHome, "1~", "1;2~", "1;5~", "1;6~"),
-    VK(kNtVkPrior, "5~", "5;2~", "5;5~", "5;6~"),
-    VK(kNtVkDelete, "3~", "3;2~", "3;5~", "3;6~"),
-    VK(kNtVkNumpad0, "2~", "2;2~", "2;5~", "2;6~"),
-    VK(kNtVkNumpad1, "4~", "4;2~", "4;5~", "4;6~"),
-    VK(kNtVkNumpad2, "B", "1;2B", "1;5B", "1;6B"),
-    VK(kNtVkNumpad3, "6~", "6;2~", "6;5~", "6;6~"),
-    VK(kNtVkNumpad4, "D", "1;2D", "1;5D", "1;6D"),
-    VK(kNtVkNumpad5, "G", "1;2G", "1;5G", "1;6G"),
-    VK(kNtVkNumpad6, "C", "1;2C", "1;5C", "1;6C"),
-    VK(kNtVkNumpad7, "A", "1;2A", "1;5A", "1;6A"),
-    VK(kNtVkNumpad8, "1~", "1;2~", "1;5~", "1;6~"),
-    VK(kNtVkNumpad9, "5~", "5;2~", "5;5~", "5;6~"),
-    VK(kNtVkDecimal, "3~", "3;2~", "3;5~", "3;6~"),
-    VK(kNtVkF1, "[A", "23~", "11^", "23^"),
-    VK(kNtVkF2, "[B", "24~", "12^", "24^"),
-    VK(kNtVkF3, "[C", "25~", "13^", "25^"),
-    VK(kNtVkF4, "[D", "26~", "14^", "26^"),
-    VK(kNtVkF5, "[E", "28~", "15^", "28^"),
-    VK(kNtVkF6, "17~", "29~", "17^", "29^"),
-    VK(kNtVkF7, "18~", "31~", "18^", "31^"),
-    VK(kNtVkF8, "19~", "32~", "19^", "32^"),
-    VK(kNtVkF9, "20~", "33~", "20^", "33^"),
-    VK(kNtVkF10, "21~", "34~", "21^", "34^"),
-    VK(kNtVkF11, "23~", "23$", "23^", "23@"),
-    VK(kNtVkF12, "24~", "24$", "24^", "24@"),
-#undef VK
-#undef W4
-#undef SW
+#define S(s) W(s "\0\0")
+#define W(s) (s[3] << 24 | s[2] << 16 | s[1] << 8 | s[0])
+    {kNtVkUp, S("A"), S("1;2A"), S("1;5A"), S("1;6A")},
+    {kNtVkDown, S("B"), S("1;2B"), S("1;5B"), S("1;6B")},
+    {kNtVkLeft, S("D"), S("1;2D"), S("1;5D"), S("1;6D")},
+    {kNtVkRight, S("C"), S("1;2C"), S("1;5C"), S("1;6C")},
+    {kNtVkInsert, S("2~"), S("2;2~"), S("2;5~"), S("2;6~")},
+    {kNtVkDelete, S("3~"), S("3;2~"), S("3;5~"), S("3;6~")},
+    {kNtVkHome, S("H"), S("1;2H"), S("1;5H"), S("1;6H")},
+    {kNtVkEnd, S("F"), S("1;2F"), S("1;5F"), S("1;6F")},
+    {kNtVkPrior, S("5~"), S("5;2~"), S("5;5~"), S("5;6~")},
+    {kNtVkNext, S("6~"), S("6;2~"), S("6;5~"), S("6;6~")},
+    {kNtVkF1, -S("OP"), S("1;2P"), S("11^"), S("1;6P")},
+    {kNtVkF2, -S("OQ"), S("1;2Q"), S("12^"), S("1;6Q")},
+    {kNtVkF3, -S("OR"), S("1;2R"), S("13^"), S("1;6R")},
+    {kNtVkF4, -S("OS"), S("1;2S"), S("14^"), S("1;6S")},
+    {kNtVkF5, S("15~"), S("28~"), S("15^"), S("28^")},
+    {kNtVkF6, S("17~"), S("29~"), S("17^"), S("29^")},
+    {kNtVkF7, S("18~"), S("31~"), S("18^"), S("31^")},
+    {kNtVkF8, S("19~"), S("32~"), S("19^"), S("32^")},
+    {kNtVkF9, S("20~"), S("33~"), S("20^"), S("33^")},
+    {kNtVkF10, S("21~"), S("34~"), S("21^"), S("34^")},
+    {kNtVkF11, S("23~"), S("23$"), S("23^"), S("23@")},
+    {kNtVkF12, S("24~"), S("24$"), S("24^"), S("24@")},
+#undef W
+#undef S
 };
 
-static textwindows int ProcessSignal(int sig, struct Fd *f) {
-  if (f) {
-    if (_weaken(__sig_raise)) {
-      pthread_mutex_unlock(&f->lock);
-      _weaken(__sig_raise)(sig, SI_KERNEL);
-      pthread_mutex_lock(&f->lock);
-      if (!(__sighandflags[sig] & SA_RESTART)) {
-        return eintr();
-      }
-    } else if (sig != SIGWINCH) {
-      TerminateThisProcess(sig);
-    }
-  }
-  return 0;
+#define KEYSTROKE_CONTAINER(e) DLL_CONTAINER(struct Keystroke, elem, e)
+
+struct Keystroke {
+  char buf[32];
+  unsigned buflen;
+  struct Dll elem;
+};
+
+struct Keystrokes {
+  struct Dll *list;
+  struct Dll *free;
+  bool end_of_file;
+  uint16_t utf16hs;
+  unsigned allocated;
+  pthread_mutex_t lock;
+  struct Keystroke pool[32];
+};
+
+static struct Keystrokes __keystroke;
+
+static textwindows void LockKeystrokes(void) {
+  pthread_mutex_lock(&__keystroke.lock);
 }
 
-static textwindows uint32_t GetVirtualKey(uint16_t vk, bool shift, bool ctrl) {
+static textwindows void UnlockKeystrokes(void) {
+  pthread_mutex_unlock(&__keystroke.lock);
+}
+
+static textwindows uint64_t BlockSignals(void) {
+  return atomic_exchange(&__get_tls()->tib_sigmask, -1);
+}
+
+static textwindows void UnblockSignals(uint64_t mask) {
+  atomic_store_explicit(&__get_tls()->tib_sigmask, mask, memory_order_release);
+}
+
+static textwindows int GetVirtualKey(uint16_t vk, bool shift, bool ctrl) {
   for (int i = 0; i < ARRAYLEN(kVirtualKey); ++i) {
     if (kVirtualKey[i].vk == vk) {
       if (shift && ctrl) {
@@ -144,33 +142,7 @@ static textwindows uint32_t GetVirtualKey(uint16_t vk, bool shift, bool ctrl) {
   return 0;
 }
 
-// Manual CMD.EXE echoing for when !ICANON && ECHO is the case.
-static textwindows void EchoTerminalInput(struct Fd *f, char *p, size_t n) {
-  int64_t hOutput;
-  if (f->kind == kFdConsole) {
-    hOutput = f->extra;
-  } else {
-    hOutput = g_fds.p[1].handle;
-  }
-  if (__ttymagic & kFdTtyEchoRaw) {
-    WriteFile(hOutput, p, n, 0, 0);
-  } else {
-    size_t i;
-    for (i = 0; i < n; ++i) {
-      if (isascii(p[i]) && iscntrl(p[i]) && p[i] != '\n' && p[i] != '\t') {
-        char ctl[2];
-        ctl[0] = '^';
-        ctl[1] = p[i] ^ 0100;
-        WriteFile(hOutput, ctl, 2, 0, 0);
-      } else {
-        WriteFile(hOutput, p + i, 1, 0, 0);
-      }
-    }
-  }
-}
-
-static textwindows int ProcessKeyEvent(const struct NtInputRecord *r, char *p,
-                                       uint16_t *utf16hs, struct Fd *f) {
+static textwindows int ProcessKeyEvent(const struct NtInputRecord *r, char *p) {
 
   uint16_t c = r->Event.KeyEvent.uChar.UnicodeChar;
   uint16_t vk = r->Event.KeyEvent.wVirtualKeyCode;
@@ -181,23 +153,10 @@ static textwindows int ProcessKeyEvent(const struct NtInputRecord *r, char *p,
     return 0;
   }
 
-  // ignore numpad being used to compose a character
-  if ((cks & kNtLeftAltPressed) && !(cks & kNtEnhancedKey) &&
-      (vk == kNtVkInsert || vk == kNtVkEnd || vk == kNtVkDown ||
-       vk == kNtVkNext || vk == kNtVkLeft || vk == kNtVkClear ||
-       vk == kNtVkRight || vk == kNtVkHome || vk == kNtVkUp ||
-       vk == kNtVkPrior || vk == kNtVkNumpad0 || vk == kNtVkNumpad1 ||
-       vk == kNtVkNumpad2 || vk == kNtVkNumpad3 || vk == kNtVkNumpad4 ||
-       vk == kNtVkNumpad5 || vk == kNtVkNumpad6 || vk == kNtVkNumpad7 ||
-       vk == kNtVkNumpad8 || vk == kNtVkNumpad9)) {
-    return 0;
-  }
-
-  int n = 0;
-
   // process virtual keys
+  int n = 0;
   if (!c) {
-    uint32_t w;
+    int w;
     w = GetVirtualKey(vk, !!(cks & kNtShiftPressed),
                       !!(cks & (kNtLeftCtrlPressed | kNtRightCtrlPressed)));
     if (!w) return 0;
@@ -205,7 +164,11 @@ static textwindows int ProcessKeyEvent(const struct NtInputRecord *r, char *p,
     if (cks & (kNtLeftAltPressed | kNtRightAltPressed)) {
       p[n++] = 033;
     }
-    p[n++] = '[';
+    if (w > 0) {
+      p[n++] = '[';
+    } else {
+      w = -w;
+    }
     do p[n++] = w;
     while ((w >>= 8));
     return n;
@@ -213,11 +176,11 @@ static textwindows int ProcessKeyEvent(const struct NtInputRecord *r, char *p,
 
   // translate utf-16 into utf-32
   if (IsHighSurrogate(c)) {
-    *utf16hs = c;
+    __keystroke.utf16hs = c;
     return 0;
   }
   if (IsLowSurrogate(c)) {
-    c = MergeUtf16(*utf16hs, c);
+    c = MergeUtf16(__keystroke.utf16hs, c);
   }
 
   // enter sends \r in a raw terminals
@@ -240,15 +203,21 @@ static textwindows int ProcessKeyEvent(const struct NtInputRecord *r, char *p,
   // handle ctrl-c and ctrl-\, which tcsetattr() is able to remap
   if (!(__ttymagic & kFdTtyNoIsigs)) {
     if (c == __vintr && __vintr != _POSIX_VDISABLE) {
-      return ProcessSignal(SIGINT, f);
+      STRACE("encountered CTRL(%#c) c_cc[VINTR] will raise SIGINT", CTRL(c));
+      __get_tls()->tib_sigpending |= 1ull << (SIGINT - 1);
+      return 0;
     } else if (c == __vquit && __vquit != _POSIX_VDISABLE) {
-      return ProcessSignal(SIGQUIT, f);
+      STRACE("encountered CTRL(%#c) c_cc[VQUITR] will raise SIGQUIT", CTRL(c));
+      __get_tls()->tib_sigpending |= 1ull << (SIGQUIT - 1);
+      return 0;
     }
   }
 
   // handle ctrl-d the end of file keystroke
   if (c == __veof && __veof != _POSIX_VDISABLE) {
-    return enodata();
+    STRACE("encountered CTRL(%#c) c_cc[VEOF] closing console input", CTRL(c));
+    __keystroke.end_of_file = true;
+    return 0;
   }
 
   // insert esc prefix when alt is held
@@ -269,11 +238,11 @@ static textwindows int ProcessKeyEvent(const struct NtInputRecord *r, char *p,
 //   - write(1, "\e[?1000;1002;1015;1006h") to enable
 //   - write(1, "\e[?1000;1002;1015;1006l") to disable
 // See o//examples/ttyinfo.com and o//tool/viz/life.com
-static textwindows int ProcessMouseEvent(const struct NtInputRecord *r, char *b,
-                                         struct Fd *f) {
+static textwindows int ProcessMouseEvent(const struct NtInputRecord *r,
+                                         char *b) {
   int e = 0;
   char *p = b;
-  uint32_t currentbs = f ? f->mousebuttons : 0;
+  uint32_t currentbs = __mousebuttons;
   uint32_t ev = r->Event.MouseEvent.dwEventFlags;
   uint32_t bs = r->Event.MouseEvent.dwButtonState;
   ev &= kNtMouseMoved | kNtMouseWheeled;
@@ -320,98 +289,195 @@ static textwindows int ProcessMouseEvent(const struct NtInputRecord *r, char *b,
     } else {
       *p++ = 'M';  // down
     }
-    if (f) {
-      f->mousebuttons = bs;
-    }
+    __mousebuttons = bs;
   }
   return p - b;
 }
 
-textwindows int ConvertConsoleInputToAnsi(const struct NtInputRecord *r,
-                                          char p[hasatleast 32],
-                                          uint16_t *utf16hs, struct Fd *f) {
+static textwindows int ConvertConsoleInputToAnsi(const struct NtInputRecord *r,
+                                                 char p[hasatleast 32]) {
   switch (r->EventType) {
     case kNtKeyEvent:
-      return ProcessKeyEvent(r, p, utf16hs, f);
+      return ProcessKeyEvent(r, p);
     case kNtMouseEvent:
-      return ProcessMouseEvent(r, p, f);
+      return ProcessMouseEvent(r, p);
     case kNtWindowBufferSizeEvent:
-      return ProcessSignal(SIGWINCH, f);
+      STRACE("detected console resize will raise SIGWINCH");
+      __get_tls()->tib_sigpending |= 1ull << (SIGWINCH - 1);
+      return 0;
     default:
       return 0;
   }
 }
 
-static textwindows ssize_t ReadFromWindowsConsole(struct Fd *f, void *data,
-                                                  size_t size) {
-  ssize_t rc;
-  int e = errno;
-  uint16_t utf16hs = 0;
-  pthread_mutex_lock(&f->lock);
-  for (;;) {
-    if (f->eoftty) {
-      rc = 0;
-      break;
-    }
-    uint32_t got = MIN(size, f->buflen);
-    uint32_t remain = f->buflen - got;
-    if (got) memcpy(data, f->buf, got);
-    if (remain) memmove(f->buf, f->buf + got, remain);
-    f->buflen = remain;
-    if (got) {
-      rc = got;
-      break;
-    }
-    uint32_t events_available;
-    if (!GetNumberOfConsoleInputEvents(f->handle, &events_available)) {
-      rc = __winerr();
-      break;
-    }
-    if (events_available) {
-      uint32_t n;
-      struct NtInputRecord r;
-      if (!ReadConsoleInput(f->handle, &r, 1, &n)) {
-        rc = __winerr();
-        break;
-      }
-      rc = ConvertConsoleInputToAnsi(&r, f->buf, &utf16hs, f);
-      if (rc == -1) {
-        if (errno == ENODATA) {
-          f->eoftty = true;
-          errno = e;
-          rc = 0;
-        }
-        break;
-      }
-      f->buflen = rc;
+static textwindows struct Keystroke *NewKeystroke(void) {
+  struct Dll *e;
+  struct Keystroke *k = 0;
+  int i, n = ARRAYLEN(__keystroke.pool);
+  if (atomic_load_explicit(&__keystroke.allocated, memory_order_acquire) < n &&
+      (i = atomic_fetch_add(&__keystroke.allocated, 1)) < n) {
+    k = __keystroke.pool + i;
+  } else if ((e = dll_first(__keystroke.free))) {
+    k = KEYSTROKE_CONTAINER(e);
+    dll_remove(&__keystroke.free, &k->elem);
+  } else {
+    return 0;
+  }
+  bzero(k, sizeof(*k));
+  dll_init(&k->elem);
+  return k;
+}
+
+static textwindows void IngestConsoleInputRecord(struct NtInputRecord *r) {
+  int len;
+  struct Keystroke *k;
+  char buf[sizeof(k->buf)];
+  if ((len = ConvertConsoleInputToAnsi(r, buf))) {
+    if ((k = NewKeystroke())) {
+      memcpy(k->buf, buf, sizeof(k->buf));
+      k->buflen = len;
+      dll_make_last(&__keystroke.list, &k->elem);
     } else {
-      if (f->flags & O_NONBLOCK) {
-        rc = 0;
-        break;
-      }
-      uint32_t ms = __SIG_POLL_INTERVAL_MS;
-      if (__ttymagic & kFdTtyNoBlock) {
-        if (!__vtime) {
-          rc = 0;
-          break;
-        } else {
-          ms = __vtime * 100;
+      STRACE("ran out of memory to hold keystroke %#.*s", len, buf);
+    }
+  }
+}
+
+static textwindows void IngestConsoleInput(int64_t handle) {
+  uint32_t i, n;
+  struct NtInputRecord records[16];
+  if (!__keystroke.end_of_file) {
+    do {
+      if (GetNumberOfConsoleInputEvents(handle, &n)) {
+        if (n) {
+          n = MIN(ARRAYLEN(records), n);
+          if (ReadConsoleInput(handle, records, n, &n)) {
+            for (i = 0; i < n && !__keystroke.end_of_file; ++i) {
+              IngestConsoleInputRecord(records + i);
+            }
+          } else {
+            STRACE("ReadConsoleInput failed w/ %d", GetLastError());
+            __keystroke.end_of_file = true;
+            break;
+          }
         }
-      }
-      if ((rc = _check_interrupts(kSigOpRestartable))) {
+      } else {
+        STRACE("GetNumberOfConsoleInputRecords failed w/ %d", GetLastError());
+        __keystroke.end_of_file = true;
         break;
       }
-      struct PosixThread *pt = _pthread_self();
-      pt->pt_flags |= PT_INSEMAPHORE;
-      WaitForSingleObject(pt->semaphore, ms);
-      pt->pt_flags &= ~PT_INSEMAPHORE;
-      if (pt->abort_errno == ECANCELED) {
-        rc = ecanceled();
-        break;
+    } while (n == ARRAYLEN(records));
+  }
+}
+
+textwindows int FlushConsoleInputBytes(int64_t handle) {
+  int rc;
+  uint64_t m;
+  m = BlockSignals();
+  LockKeystrokes();
+  if (FlushConsoleInputBuffer(handle)) {
+    dll_make_first(&__keystroke.free, __keystroke.list);
+    __keystroke.list = 0;
+    rc = 0;
+  } else {
+    rc = __winerr();
+  }
+  UnlockKeystrokes();
+  UnblockSignals(m);
+  return rc;
+}
+
+textwindows int CountConsoleInputBytes(int64_t handle) {
+  int count = 0;
+  struct Dll *e;
+  uint64_t m = BlockSignals();
+  LockKeystrokes();
+  IngestConsoleInput(handle);
+  for (e = dll_first(__keystroke.list); e; e = dll_next(__keystroke.list, e)) {
+    count += KEYSTROKE_CONTAINER(e)->buflen;
+  }
+  if (!count && __keystroke.end_of_file) {
+    count = -1;
+  }
+  UnlockKeystrokes();
+  UnblockSignals(m);
+  return count;
+}
+
+static textwindows bool DigestConsoleInput(void *data, size_t size, int *rc) {
+  struct Dll *e;
+  if ((e = dll_first(__keystroke.list))) {
+    struct Keystroke *k = KEYSTROKE_CONTAINER(e);
+    uint32_t got = MIN(size, k->buflen);
+    uint32_t remain = k->buflen - got;
+    if (got) memcpy(data, k->buf, got);
+    if (remain) memmove(k->buf, k->buf + got, remain);
+    if (!remain) {
+      dll_remove(&__keystroke.list, e);
+      dll_make_first(&__keystroke.free, e);
+    }
+    k->buflen = remain;
+    if (got) {
+      *rc = got;
+      return true;
+    }
+  } else if (__keystroke.end_of_file) {
+    *rc = 0;
+    return true;
+  }
+  return false;
+}
+
+// Manual CMD.EXE echoing for when !ICANON && ECHO is the case.
+static textwindows void EchoTerminalInput(struct Fd *f, char *p, size_t n) {
+  int64_t hOutput;
+  if (f->kind == kFdConsole) {
+    hOutput = f->extra;
+  } else {
+    hOutput = g_fds.p[1].handle;
+  }
+  if (__ttymagic & kFdTtyEchoRaw) {
+    WriteFile(hOutput, p, n, 0, 0);
+  } else {
+    size_t i;
+    for (i = 0; i < n; ++i) {
+      if (isascii(p[i]) && iscntrl(p[i]) && p[i] != '\n' && p[i] != '\t') {
+        char ctl[2];
+        ctl[0] = '^';
+        ctl[1] = p[i] ^ 0100;
+        WriteFile(hOutput, ctl, 2, 0, 0);
+      } else {
+        WriteFile(hOutput, p + i, 1, 0, 0);
       }
     }
   }
-  pthread_mutex_unlock(&f->lock);
+}
+
+static textwindows ssize_t ReadFromWindowsConsole(struct Fd *f, void *data,
+                                                  size_t size) {
+  int rc = -1;
+  for (;;) {
+    bool done = false;
+    uint64_t m;
+    m = BlockSignals();
+    LockKeystrokes();
+    IngestConsoleInput(f->handle);
+    done = DigestConsoleInput(data, size, &rc);
+    UnlockKeystrokes();
+    UnblockSignals(m);
+    if (done) break;
+    if (f->flags & O_NONBLOCK) return eagain();
+    uint32_t ms = __SIG_POLL_INTERVAL_MS;
+    if (__ttymagic & kFdTtyNoBlock) {
+      if (!__vtime) {
+        return 0;
+      } else {
+        ms = __vtime * 100;
+      }
+    }
+    if (_check_interrupts(kSigOpRestartable)) return -1;
+    if (__pause_thread(ms)) return -1;
+  }
   if (rc > 0 && (__ttymagic & kFdTtyEchoing)) {
     EchoTerminalInput(f, data, size);
   }
@@ -510,6 +576,12 @@ textwindows ssize_t sys_read_nt_impl(int fd, void *data, size_t size,
     return got;
   }
 
+  errno_t err;
+  if (_weaken(pthread_testcancel_np) &&
+      (err = _weaken(pthread_testcancel_np)())) {
+    return ecanceled();
+  }
+
   switch (GetLastError()) {
     case kNtErrorBrokenPipe:    // broken pipe
     case kNtErrorNoData:        // closing named pipe
diff --git a/libc/calls/setrlimit.c b/libc/calls/setrlimit.c
index e43e05cb9..91886c7f3 100644
--- a/libc/calls/setrlimit.c
+++ b/libc/calls/setrlimit.c
@@ -97,3 +97,5 @@ int setrlimit(int resource, const struct rlimit *rlim) {
          DescribeRlimit(0, rlim), rc);
   return rc;
 }
+
+__weak_reference(setrlimit, setrlimit64);
diff --git a/libc/calls/sig.c b/libc/calls/sig.c
index 48ddf6efc..c4daee116 100644
--- a/libc/calls/sig.c
+++ b/libc/calls/sig.c
@@ -26,6 +26,7 @@
 #include "libc/calls/state.internal.h"
 #include "libc/calls/struct/sigaction.h"
 #include "libc/calls/struct/siginfo.h"
+#include "libc/calls/struct/sigset.internal.h"
 #include "libc/calls/struct/ucontext.internal.h"
 #include "libc/calls/ucontext.h"
 #include "libc/dce.h"
@@ -49,6 +50,7 @@
 #include "libc/nt/struct/ntexceptionpointers.h"
 #include "libc/nt/synchronization.h"
 #include "libc/nt/thread.h"
+#include "libc/runtime/runtime.h"
 #include "libc/str/str.h"
 #include "libc/sysv/consts/sa.h"
 #include "libc/sysv/consts/sicode.h"
@@ -124,19 +126,21 @@ static textwindows bool __sig_start(struct PosixThread *pt, int sig,
   return true;
 }
 
+static textwindows sigaction_f __sig_handler(unsigned rva) {
+  return (sigaction_f)(__executable_start + rva);
+}
+
 static textwindows void __sig_call(int sig, siginfo_t *si, ucontext_t *ctx,
                                    unsigned rva, unsigned flags,
                                    struct CosmoTib *tib) {
-  sigaction_f handler;
-  handler = (sigaction_f)(__executable_start + rva);
   ++__sig.count;
   if (__sig_should_use_altstack(flags, tib)) {
     tib->tib_sigstack_flags |= SS_ONSTACK;
-    __stack_call(sig, si, ctx, 0, handler,
+    __stack_call(sig, si, ctx, 0, __sig_handler(rva),
                  tib->tib_sigstack_addr + tib->tib_sigstack_size);
     tib->tib_sigstack_flags &= ~SS_ONSTACK;
   } else {
-    handler(sig, si, ctx);
+    __sig_handler(rva)(sig, si, ctx);
   }
 }
 
@@ -151,21 +155,29 @@ textwindows int __sig_raise(int sig, int sic) {
   nc.ContextFlags = kNtContextAll;
   GetThreadContext(GetCurrentThread(), &nc);
   _ntcontext2linux(&ctx, &nc);
-  STRACE("raising %G", sig);
   if (!(flags & SA_NODEFER)) {
     tib->tib_sigmask |= 1ull << (sig - 1);
   }
+  STRACE("entering raise(%G) signal handler %t with mask %s → %s", sig,
+         __sig_handler(rva), DescribeSigset(0, &ctx.uc_sigmask),
+         DescribeSigset(0, &(sigset_t){{pt->tib->tib_sigmask}}));
   __sig_call(sig, &si, &ctx, rva, flags, tib);
+  STRACE("leaving raise(%G) signal handler %t with mask %s → %s", sig,
+         __sig_handler(rva),
+         DescribeSigset(0, &(sigset_t){{pt->tib->tib_sigmask}}),
+         DescribeSigset(0, &ctx.uc_sigmask));
   tib->tib_sigmask = ctx.uc_sigmask.__bits[0];
   return (flags & SA_RESTART) ? 2 : 1;
 }
 
-textwindows void __sig_cancel(struct PosixThread *pt) {
+textwindows void __sig_cancel(struct PosixThread *pt, unsigned flags) {
   atomic_int *futex;
   if (_weaken(WakeByAddressSingle) &&
       (futex = atomic_load_explicit(&pt->pt_futex, memory_order_acquire))) {
+    STRACE("canceling futex");
     _weaken(WakeByAddressSingle)(futex);
-  } else if (pt->iohandle > 0) {
+  } else if (!(flags & SA_RESTART) && pt->iohandle > 0) {
+    STRACE("canceling i/o operation");
     if (!CancelIoEx(pt->iohandle, pt->ioverlap)) {
       int err = GetLastError();
       if (err != kNtErrorNotFound) {
@@ -173,9 +185,13 @@ textwindows void __sig_cancel(struct PosixThread *pt) {
       }
     }
   } else if (pt->pt_flags & PT_INSEMAPHORE) {
+    STRACE("canceling semaphore");
+    pt->pt_flags &= ~PT_INSEMAPHORE;
     if (!ReleaseSemaphore(pt->semaphore, 1, 0)) {
       STRACE("ReleaseSemaphore() failed w/ %d", GetLastError());
     }
+  } else {
+    STRACE("canceling asynchronously");
   }
 }
 
@@ -194,16 +210,25 @@ static textwindows wontreturn void __sig_panic(const char *msg) {
 
 static textwindows wontreturn void __sig_tramp(struct SignalFrame *sf) {
   ucontext_t ctx = {0};
-  sigaction_f handler = (sigaction_f)(__executable_start + sf->rva);
-  STRACE("__sig_tramp(%G, %t)", sf->si.si_signo, handler);
+  int sig = sf->si.si_signo;
   _ntcontext2linux(&ctx, sf->nc);
-  ctx.uc_sigmask.__bits[0] = sf->pt->tib->tib_sigmask;
+  ctx.uc_sigmask.__bits[0] =
+      atomic_load_explicit(&sf->pt->tib->tib_sigmask, memory_order_acquire);
   if (!(sf->flags & SA_NODEFER)) {
-    sf->pt->tib->tib_sigmask |= 1ull << (sf->si.si_signo - 1);
+    sf->pt->tib->tib_sigmask |= 1ull << (sig - 1);
   }
   ++__sig.count;
-  handler(sf->si.si_signo, &sf->si, &ctx);
-  sf->pt->tib->tib_sigmask = ctx.uc_sigmask.__bits[0];
+  STRACE("entering __sig_tramp(%G, %t) with mask %s → %s", sig,
+         __sig_handler(sf->rva), DescribeSigset(0, &ctx.uc_sigmask),
+         DescribeSigset(0, &(sigset_t){{sf->pt->tib->tib_sigmask}}));
+  __sig_handler(sf->rva)(sig, &sf->si, &ctx);
+  STRACE("leaving __sig_tramp(%G, %t) with mask %s → %s", sig,
+         __sig_handler(sf->rva),
+         DescribeSigset(0, &(sigset_t){{sf->pt->tib->tib_sigmask}}),
+         DescribeSigset(0, &ctx.uc_sigmask));
+  atomic_store_explicit(&sf->pt->tib->tib_sigmask, ctx.uc_sigmask.__bits[0],
+                        memory_order_release);
+  // TDOO(jart): Do we need to do a __sig_check() here?
   _ntlinux2context(sf->nc, &ctx);
   SetThreadContext(GetCurrentThread(), sf->nc);
   __sig_panic("SetThreadContext(GetCurrentThread)");
@@ -259,7 +284,7 @@ static textwindows int __sig_killer(struct PosixThread *pt, int sig, int sic) {
   }
   ResumeThread(th);  // doesn't actually resume if doing blocking i/o
   pt->abort_errno = EINTR;
-  __sig_cancel(pt);  // we can wake it up immediately by canceling it
+  __sig_cancel(pt, flags);  // we can wake it up immediately by canceling it
   return 0;
 }
 
@@ -431,7 +456,7 @@ __msabi textwindows dontinstrument bool32 __sig_console(uint32_t dwCtrlType) {
 
 static textwindows int __sig_checkem(atomic_ulong *sigs, struct CosmoTib *tib,
                                      const char *thing, int id) {
-  bool handler_was_called = false;
+  int handler_was_called = 0;
   uint64_t pending, masked, deliverable;
   pending = atomic_load_explicit(sigs, memory_order_acquire);
   masked = atomic_load_explicit(&tib->tib_sigmask, memory_order_acquire);
@@ -454,12 +479,12 @@ static textwindows int __sig_checkem(atomic_ulong *sigs, struct CosmoTib *tib,
 // didn't have the SA_RESTART flag, and `2`, which means SA_RESTART
 // handlers were called (or `3` if both were the case).
 textwindows int __sig_check(void) {
-  bool handler_was_called = false;
+  int handler_was_called = false;
   struct CosmoTib *tib = __get_tls();
   handler_was_called |=
       __sig_checkem(&tib->tib_sigpending, tib, "tid", tib->tib_tid);
   handler_was_called |= __sig_checkem(&__sig.pending, tib, "pid", getpid());
-  POLLTRACE("__sig_check() → %hhhd", handler_was_called);
+  POLLTRACE("__sig_check() → %d", handler_was_called);
   return handler_was_called;
 }
 
diff --git a/libc/calls/sig.internal.h b/libc/calls/sig.internal.h
index 8b0d8685c..083b4c20d 100644
--- a/libc/calls/sig.internal.h
+++ b/libc/calls/sig.internal.h
@@ -26,7 +26,7 @@ int __sig_check(void);
 int __sig_kill(struct PosixThread *, int, int);
 int __sig_mask(int, const sigset_t *, sigset_t *);
 int __sig_raise(int, int);
-void __sig_cancel(struct PosixThread *);
+void __sig_cancel(struct PosixThread *, unsigned);
 void __sig_generate(int, int);
 void __sig_init(void);
 
diff --git a/libc/calls/sigsuspend.c b/libc/calls/sigsuspend.c
index a3a1e5e69..45f08d7cf 100644
--- a/libc/calls/sigsuspend.c
+++ b/libc/calls/sigsuspend.c
@@ -70,17 +70,7 @@ int sigsuspend(const sigset_t *ignore) {
     } else {
       __sig_mask(SIG_SETMASK, arg, &save);
       while (!(rc = _check_interrupts(0))) {
-        struct PosixThread *pt;
-        pt = _pthread_self();
-        pt->abort_errno = 0;
-        pt->pt_flags |= PT_INSEMAPHORE;
-        WaitForSingleObject(pt->semaphore, __SIG_SIG_INTERVAL_MS);
-        pt->pt_flags &= ~PT_INSEMAPHORE;
-        if (pt->abort_errno) {
-          errno = pt->abort_errno;
-          rc = -1;
-          break;
-        }
+        if ((rc = __pause_thread(__SIG_SIG_INTERVAL_MS))) break;
       }
       __sig_mask(SIG_SETMASK, &save, 0);
     }
diff --git a/libc/calls/statfs.c b/libc/calls/statfs.c
index bd563ee6a..ed6407a43 100644
--- a/libc/calls/statfs.c
+++ b/libc/calls/statfs.c
@@ -66,3 +66,5 @@ int statfs(const char *path, struct statfs *sf) {
   STRACE("statfs(%#s, [%s]) → %d% m", path, DescribeStatfs(rc, sf));
   return rc;
 }
+
+__weak_reference(statfs, statfs64);
diff --git a/libc/calls/struct/fd.internal.h b/libc/calls/struct/fd.internal.h
index 27c4ec293..c1a0b3d50 100644
--- a/libc/calls/struct/fd.internal.h
+++ b/libc/calls/struct/fd.internal.h
@@ -31,15 +31,12 @@ struct Fd {
   char kind;
   bool eoftty;
   bool dontclose;
-  unsigned char buflen;
   unsigned flags;
   unsigned mode;
   int64_t handle;
   int64_t extra;
   int64_t pointer;
   pthread_mutex_t lock;
-  unsigned char mousebuttons;
-  char buf[32];
 };
 
 struct StdinRelay {
diff --git a/libc/calls/tcflush.c b/libc/calls/tcflush.c
index 2cea37d70..3111b2eb3 100644
--- a/libc/calls/tcflush.c
+++ b/libc/calls/tcflush.c
@@ -67,30 +67,7 @@ static dontinline textwindows int sys_tcflush_nt(int fd, int queue) {
   if (queue == TCOFLUSH) {
     return 0;  // windows console output is never buffered
   }
-  FlushConsoleInputBuffer(hConin);
-  int rc = 0;
-  int e = errno;
-  int oldflags = g_fds.p[fd].flags;
-  g_fds.p[fd].flags |= O_NONBLOCK;
-  for (;;) {
-    char buf[512];
-    ssize_t got = sys_read_nt_impl(fd, buf, 512, -1);
-    if (!got) {
-      break;
-    } else if (got == -1) {
-      if (errno == EAGAIN) {
-        errno = e;
-      } else if (errno == EINTR) {
-        errno = e;
-        continue;
-      } else {
-        rc = -1;
-      }
-      break;
-    }
-  }
-  g_fds.p[fd].flags = oldflags;
-  return rc;
+  return FlushConsoleInputBytes(hConin);
 }
 
 /**
diff --git a/libc/calls/tcgetattr-nt.c b/libc/calls/tcgetattr-nt.c
index 80234e1f7..fe815e563 100644
--- a/libc/calls/tcgetattr-nt.c
+++ b/libc/calls/tcgetattr-nt.c
@@ -25,6 +25,7 @@
 #include "libc/macros.internal.h"
 #include "libc/nt/console.h"
 #include "libc/nt/enum/consolemodeflags.h"
+#include "libc/nt/runtime.h"
 #include "libc/nt/struct/consolescreenbufferinfoex.h"
 #include "libc/str/str.h"
 #include "libc/sysv/consts/baud.internal.h"
diff --git a/libc/calls/weirdtypes.h b/libc/calls/weirdtypes.h
index edcbb701e..072735dcb 100644
--- a/libc/calls/weirdtypes.h
+++ b/libc/calls/weirdtypes.h
@@ -50,11 +50,40 @@ typedef uint32_t nlink_t; /* uint16_t on xnu */
 #define TIME_T_MIN (-TIME_T_MAX - 1)
 
 #if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
-#define blkcnt64_t   blkcnt_t
-#define fsblkcnt64_t fsblkcnt_t
-#define fsfilcnt64_t fsfilcnt_t
-#define ino64_t      ino_t
-#define off64_t      off_t
+#define F_GETLK64         F_GETLK
+#define F_SETLK64         F_SETLK
+#define F_SETLKW64        F_SETLKW
+#define RLIM64_INFINITY   RLIM_INFINITY
+#define RLIM64_SAVED_CUR  RLIM_SAVED_CUR
+#define RLIM64_SAVED_MAX  RLIM_SAVED_MAX
+#define alphasort64       alphasort
+#define blkcnt64_t        blkcnt_t
+#define dirent64          dirent
+#define flock64           flock
+#define fsfilcnt64_t      fsfilcnt_t
+#define fstat64           fstat
+#define fstatat64         fstatat
+#define fstatfs64         fstatfs
+#define getrlimit64       getrlimit
+#define ino64_t           ino_t
+#define lockf64           lockf
+#define lstat64           lstat
+#define mmap64            mmap
+#define off64_t           off_t
+#define open64            open
+#define openat64          openat
+#define posix_fadvise64   posix_fadvise
+#define posix_fallocate64 posix_fallocate
+#define readdir64         readdir
+#define readdir64_r       readdir_r
+#define rlim64_t          rlim_t
+#define rlimit64          rlimit
+#define scandir64         scandir
+#define sendfile64        sendfile
+#define setrlimit64       setrlimit
+#define stat64            stat
+#define statfs64          statfs
+#define versionsort64     versionsort
 #endif
 
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
diff --git a/libc/calls/write-nt.c b/libc/calls/write-nt.c
index 033281a93..83ac291eb 100644
--- a/libc/calls/write-nt.c
+++ b/libc/calls/write-nt.c
@@ -86,10 +86,6 @@ static textwindows ssize_t sys_write_nt_impl(int fd, void *data, size_t size,
   if (!pwriting) {
     offset = 0;
   }
-  if (seekable && !pwriting) {
-    pthread_mutex_lock(&f->lock);
-    offset = f->pointer;
-  }
 
   // To use the tty mouse events feature:
   //   - write(1, "\e[?1000;1002;1015;1006h") to enable
@@ -161,6 +157,11 @@ static textwindows ssize_t sys_write_nt_impl(int fd, void *data, size_t size,
     }
   }
 
+  if (seekable && !pwriting) {
+    pthread_mutex_lock(&f->lock);
+    offset = f->pointer;
+  }
+
   struct NtOverlapped overlap = {.hEvent = CreateEvent(0, 0, 0, 0),
                                  .Pointer = offset};
   ok = WriteFile(handle, data, size, 0, &overlap);
@@ -212,6 +213,12 @@ static textwindows ssize_t sys_write_nt_impl(int fd, void *data, size_t size,
     return sent;
   }
 
+  errno_t err;
+  if (_weaken(pthread_testcancel_np) &&
+      (err = _weaken(pthread_testcancel_np)())) {
+    return ecanceled();
+  }
+
   switch (GetLastError()) {
     // case kNtErrorInvalidHandle:
     //   return ebadf(); /* handled by consts.sh */
diff --git a/libc/intrin/describefdset.c b/libc/intrin/describefdset.c
new file mode 100644
index 000000000..165c7e760
--- /dev/null
+++ b/libc/intrin/describefdset.c
@@ -0,0 +1,61 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2021 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/dce.h"
+#include "libc/intrin/asan.internal.h"
+#include "libc/intrin/bsr.h"
+#include "libc/intrin/kprintf.h"
+#include "libc/sock/select.h"
+#include "libc/sock/select.internal.h"
+
+#define N 100
+
+#define append(...) o += ksnprintf(buf + o, N - o, __VA_ARGS__)
+
+const char *(DescribeFdSet)(char buf[N], ssize_t rc, int nfds, fd_set *fds) {
+  int o = 0;
+
+  if (!fds) return "NULL";
+  if ((!IsAsan() && kisdangerous(fds)) ||
+      (IsAsan() && !__asan_is_valid(fds, sizeof(*fds) * nfds))) {
+    ksnprintf(buf, N, "%p", fds);
+    return buf;
+  }
+
+  append("{");
+
+  bool gotsome = false;
+  for (int fd = 0; fd < nfds; fd += 64) {
+    uint64_t w = fds->fds_bits[fd >> 6];
+    while (w) {
+      unsigned o = _bsr(w);
+      w &= ~((uint64_t)1 << o);
+      if (fd + o < nfds) {
+        if (!gotsome) {
+          gotsome = true;
+          append(", ");
+          append("%d", fd);
+        }
+      }
+    }
+  }
+
+  append("}");
+
+  return buf;
+}
diff --git a/libc/intrin/g_fds.c b/libc/intrin/g_fds.c
index e6d09efbe..2d26d3104 100644
--- a/libc/intrin/g_fds.c
+++ b/libc/intrin/g_fds.c
@@ -19,6 +19,7 @@
 #include "libc/calls/state.internal.h"
 #include "libc/calls/struct/fd.internal.h"
 #include "libc/calls/ttydefaults.h"
+#include "libc/dce.h"
 #include "libc/intrin/atomic.h"
 #include "libc/intrin/extend.internal.h"
 #include "libc/intrin/getenv.internal.h"
@@ -26,6 +27,12 @@
 #include "libc/intrin/nomultics.internal.h"
 #include "libc/intrin/pushpop.internal.h"
 #include "libc/intrin/weaken.h"
+#include "libc/nt/console.h"
+#include "libc/nt/createfile.h"
+#include "libc/nt/enum/accessmask.h"
+#include "libc/nt/enum/creationdisposition.h"
+#include "libc/nt/enum/fileflagandattributes.h"
+#include "libc/nt/enum/filesharemode.h"
 #include "libc/nt/runtime.h"
 #include "libc/runtime/memtrack.internal.h"
 #include "libc/runtime/runtime.h"
@@ -116,10 +123,10 @@ textstartup void __init_fds(int argc, char **argv, char **envp) {
     SetupWinStd(fds, 0, kNtStdInputHandle, sockset);
     SetupWinStd(fds, 1, kNtStdOutputHandle, sockset);
     SetupWinStd(fds, 2, kNtStdErrorHandle, sockset);
+    __veof = CTRL('D');
+    __vintr = CTRL('C');
+    __vquit = CTRL('\\');
   }
   fds->p[1].flags = O_WRONLY | O_APPEND;
   fds->p[2].flags = O_WRONLY | O_APPEND;
-  __veof = CTRL('D');
-  __vintr = CTRL('C');
-  __vquit = CTRL('\\');
 }
diff --git a/libc/intrin/nomultics.c b/libc/intrin/nomultics.c
index b66eae797..55e497bf9 100644
--- a/libc/intrin/nomultics.c
+++ b/libc/intrin/nomultics.c
@@ -25,3 +25,4 @@ unsigned char __veof;
 unsigned char __vintr;
 unsigned char __vquit;
 unsigned char __vtime;
+unsigned char __mousebuttons;
diff --git a/libc/intrin/nomultics.internal.h b/libc/intrin/nomultics.internal.h
index 7f3caec3f..248cd3d45 100644
--- a/libc/intrin/nomultics.internal.h
+++ b/libc/intrin/nomultics.internal.h
@@ -11,6 +11,7 @@ extern unsigned char __veof;
 extern unsigned char __vintr;
 extern unsigned char __vquit;
 extern unsigned char __vtime;
+extern unsigned char __mousebuttons;
 
 COSMOPOLITAN_C_END_
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
diff --git a/libc/intrin/strace.internal.h b/libc/intrin/strace.internal.h
index e3c27ce65..1dce6394d 100644
--- a/libc/intrin/strace.internal.h
+++ b/libc/intrin/strace.internal.h
@@ -16,13 +16,12 @@
 COSMOPOLITAN_C_START_
 
 #ifdef SYSDEBUG
-#define STRACE(FMT, ...)                                   \
-  do {                                                     \
-    if (UNLIKELY(__strace > 0) && strace_enabled(0) > 0) { \
-      ftrace_enabled(-1);                                  \
-      __stracef(STRACE_PROLOGUE FMT "\n", ##__VA_ARGS__);  \
-      ftrace_enabled(+1);                                  \
-    }                                                      \
+#define STRACE(FMT, ...)                                  \
+  do {                                                    \
+    if (UNLIKELY(strace_enter())) {                       \
+      __stracef(STRACE_PROLOGUE FMT "\n", ##__VA_ARGS__); \
+      ftrace_enabled(+1);                                 \
+    }                                                     \
   } while (0)
 #else
 #define STRACE(FMT, ...) (void)0
diff --git a/libc/intrin/strace_enter.c b/libc/intrin/strace_enter.c
new file mode 100644
index 000000000..64e4c9e59
--- /dev/null
+++ b/libc/intrin/strace_enter.c
@@ -0,0 +1,31 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2023 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/runtime/runtime.h"
+#ifdef SYSDEBUG
+
+dontinstrument bool strace_enter(void) {
+  if (strace_enabled(0) > 0) {
+    ftrace_enabled(-1);
+    return true;
+  } else {
+    return false;
+  }
+}
+
+#endif /* SYSDEBUG */
diff --git a/libc/limits.h b/libc/limits.h
index 636f0ceaf..34d863152 100644
--- a/libc/limits.h
+++ b/libc/limits.h
@@ -29,7 +29,7 @@
 #define INT16_MAX     __INT16_MAX__
 #define INT32_MAX     __INT32_MAX__
 #define INT64_MAX     __INT64_MAX__
-#define WINT_MAX      __WCHAR_MAX__
+#define WINT_MAX      __WINT_MAX__
 #define WCHAR_MAX     __WCHAR_MAX__
 #define INTPTR_MAX    __INTPTR_MAX__
 #define PTRDIFF_MAX   __PTRDIFF_MAX__
@@ -55,7 +55,7 @@
 #define INT64_MIN     (-INT64_MAX - 1)
 #define INTMAX_MIN    (-INTMAX_MAX - 1)
 #define INTPTR_MIN    (-INTPTR_MAX - 1)
-#define WINT_MIN      (-WINT_MAX - 1)
+#define WINT_MIN      __WINT_MIN__
 #define WCHAR_MIN     (-WCHAR_MAX - 1)
 #define PTRDIFF_MIN   (-PTRDIFF_MAX - 1)
 
diff --git a/libc/log/checkfail.c b/libc/log/checkfail.c
index e7b030dcc..29be8f882 100644
--- a/libc/log/checkfail.c
+++ b/libc/log/checkfail.c
@@ -30,6 +30,7 @@
 #include "libc/runtime/memtrack.internal.h"
 #include "libc/runtime/runtime.h"
 #include "libc/stdio/stdio.h"
+#include "libc/str/str.h"
 
 __static_yoink("strerror_wr");
 
@@ -69,11 +70,10 @@ relegated void __check_fail(const char *suffix,   //
     va_end(va);
     kprintf("\n");
   }
-  kprintf("\t%m\n\t%s%s", SUBTLE, program_invocation_name);
+  kprintf("\t%s\n\t%s%s", strerror(errno), SUBTLE, program_invocation_name);
   for (i = 1; i < __argc; ++i) {
     kprintf(" %s", __argv[i]);
   }
   kprintf("%s\n", RESET);
   __die();
-  __builtin_unreachable();
 }
diff --git a/libc/log/die.c b/libc/log/die.c
index e59e2072a..a39b427a9 100644
--- a/libc/log/die.c
+++ b/libc/log/die.c
@@ -47,7 +47,7 @@ relegated wontreturn void __die(void) {
   strcpy(host, "unknown");
   gethostname(host, sizeof(host));
   kprintf("%serror: %s on %s pid %d tid %d has perished%s\n"
-          "       cosmoaddr2line %s%s %s\n",
+          "cosmoaddr2line %s%s %s\n",
           __nocolor ? "" : "\e[1;31m", program_invocation_short_name, host,
           getpid(), gettid(), __nocolor ? "" : "\e[0m", __argv[0],
           endswith(__argv[0], ".com") ? ".dbg" : "",
diff --git a/libc/mem/internal.h b/libc/mem/internal.h
index 076649f54..9309c5c52 100644
--- a/libc/mem/internal.h
+++ b/libc/mem/internal.h
@@ -9,7 +9,7 @@ struct CritbitNode {
   unsigned otherbits;
 };
 
-int PutEnvImpl(char *, bool);
+int __putenv(char *, bool);
 
 COSMOPOLITAN_C_END_
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
diff --git a/libc/intrin/putenv.c b/libc/mem/putenv.c
similarity index 85%
rename from libc/intrin/putenv.c
rename to libc/mem/putenv.c
index fb9655676..e8c22414c 100644
--- a/libc/intrin/putenv.c
+++ b/libc/mem/putenv.c
@@ -19,31 +19,28 @@
 #include "libc/intrin/getenv.internal.h"
 #include "libc/intrin/leaky.internal.h"
 #include "libc/intrin/strace.internal.h"
-#include "libc/intrin/weaken.h"
 #include "libc/macros.internal.h"
 #include "libc/mem/internal.h"
 #include "libc/mem/mem.h"
 #include "libc/runtime/runtime.h"
 #include "libc/sysv/errfuns.h"
 
-#define ToUpper(c) ((c) >= 'a' && (c) <= 'z' ? (c) - 'a' + 'A' : (c))
-
 static char **expected;
 static size_t capacity;
 
-static size_t GetEnvironLen(char **env) {
+static size_t __lenenv(char **env) {
   char **p = env;
   while (*p) ++p;
   return p - env;
 }
 
-static char **GrowEnviron(char **a) {
+static char **__growenv(char **a) {
   size_t n, c;
   char **b, **p;
   if (!a) a = environ;
-  n = a ? GetEnvironLen(a) : 0;
-  c = MAX(16ul, n) << 1;
-  if (_weaken(malloc) && (b = _weaken(malloc)(c * sizeof(char *)))) {
+  n = a ? __lenenv(a) : 0;
+  c = MAX(8ul, n) << 1;
+  if ((b = malloc(c * sizeof(char *)))) {
     if (a) {
       for (p = b; *a;) {
         *p++ = *a++;
@@ -56,18 +53,17 @@ static char **GrowEnviron(char **a) {
     capacity = c;
     return b;
   } else {
-    enomem();
     return 0;
   }
 }
 
-IGNORE_LEAKS(GrowEnviron)
+IGNORE_LEAKS(__growenv)
 
-int PutEnvImpl(char *s, bool overwrite) {
+int __putenv(char *s, bool overwrite) {
   char **p;
   struct Env e;
   if (!(p = environ)) {
-    if (!(p = GrowEnviron(0))) {
+    if (!(p = __growenv(0))) {
       return -1;
     }
   }
@@ -83,7 +79,7 @@ int PutEnvImpl(char *s, bool overwrite) {
     capacity = e.i;
   }
   if (e.i + 1 >= capacity) {
-    if (!(p = GrowEnviron(p))) {
+    if (!(p = __growenv(p))) {
       return -1;
     }
   }
@@ -99,13 +95,13 @@ int PutEnvImpl(char *s, bool overwrite) {
  *     become part of the environment; changes to its memory will change
  *     the environment too
  * @return 0 on success, or non-zero w/ errno on error
- * @raise ENOMEM if we require more vespene gas
+ * @raise ENOMEM if out of memory
  * @see setenv(), getenv()
  * @threadunsafe
  */
 int putenv(char *s) {
   int rc;
-  rc = PutEnvImpl(s, true);
+  rc = __putenv(s, true);
   STRACE("putenv(%#s) → %d% m", s, rc);
   return rc;
 }
diff --git a/libc/intrin/setenv.c b/libc/mem/setenv.c
similarity index 82%
rename from libc/intrin/setenv.c
rename to libc/mem/setenv.c
index 19e91c195..6f723995b 100644
--- a/libc/intrin/setenv.c
+++ b/libc/mem/setenv.c
@@ -18,7 +18,6 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/intrin/leaky.internal.h"
 #include "libc/intrin/strace.internal.h"
-#include "libc/intrin/weaken.h"
 #include "libc/mem/internal.h"
 #include "libc/mem/mem.h"
 #include "libc/runtime/runtime.h"
@@ -29,8 +28,8 @@
  * Copies variable to environment.
  *
  * @return 0 on success, or -1 w/ errno and environment is unchanged
- * @raise ENOMEM if out of memory or malloc() wasn't linked
  * @raise EINVAL if `name` is empty or contains `'='`
+ * @raise ENOMEM if out of memory
  * @see putenv(), getenv()
  * @threadunsafe
  */
@@ -38,19 +37,14 @@ int setenv(const char *name, const char *value, int overwrite) {
   int rc;
   char *s;
   size_t n, m;
-  const char *t;
-  if (!name || !*name || !value) return einval();
-  for (t = name; *t; ++t) {
-    if (*t == '=') return einval();
+  if (!name || !*name || !value || strchr(name, '=')) return einval();
+  if ((s = malloc((n = strlen(name)) + 1 + (m = strlen(value)) + 1))) {
+    memcpy(mempcpy(mempcpy(s, name, n), "=", 1), value, m + 1);
+    rc = __putenv(s, overwrite);
+  } else {
+    rc = -1;
   }
-  n = strlen(name);
-  m = strlen(value);
-  if (!_weaken(malloc) || !(s = _weaken(malloc)(n + 1 + m + 1))) {
-    return enomem();
-  }
-  memcpy(mempcpy(mempcpy(s, name, n), "=", 1), value, m + 1);
-  rc = PutEnvImpl(s, overwrite);
-  STRACE("setenv(%#s, %#s, %d) → %d% m", name, value, overwrite, rc);
+  STRACE("setenv(%#s, %#s, %hhhd) → %d% m", name, value, overwrite, rc);
   return rc;
 }
 
diff --git a/libc/mem/wcsdup.c b/libc/mem/wcsdup.c
index a2c3c3dad..b7170cdd4 100644
--- a/libc/mem/wcsdup.c
+++ b/libc/mem/wcsdup.c
@@ -25,6 +25,6 @@
  */
 wchar_t *wcsdup(const wchar_t *s) {
   size_t len = wcslen(s);
-  char *s2 = malloc((len + 1) * sizeof(wchar_t));
-  return s2 ? memcpy(s2, s, (len + 1) * sizeof(wchar_t)) : NULL;
+  wchar_t *s2 = malloc((len + 1) * sizeof(wchar_t));
+  return s2 ? wmemcpy(s2, s, len + 1) : NULL;
 }
diff --git a/libc/nt/enum/vk.h b/libc/nt/enum/vk.h
index b52355785..3861eac20 100644
--- a/libc/nt/enum/vk.h
+++ b/libc/nt/enum/vk.h
@@ -28,8 +28,8 @@
 #define kNtVkAccept                       0x1E
 #define kNtVkModechange                   0x1F
 #define kNtVkSpace                        0x20
-#define kNtVkPrior                        0x21
-#define kNtVkNext                         0x22
+#define kNtVkPrior                        0x21 /* page up */
+#define kNtVkNext                         0x22 /* page down */
 #define kNtVkEnd                          0x23
 #define kNtVkHome                         0x24
 #define kNtVkLeft                         0x25
diff --git a/libc/proc/execve-nt.greg.c b/libc/proc/execve-nt.greg.c
index b5ca7b231..5b7837685 100644
--- a/libc/proc/execve-nt.greg.c
+++ b/libc/proc/execve-nt.greg.c
@@ -180,9 +180,6 @@ static keywords void sys_execve_nt_relay(intptr_t h, long b, long c, long d) {
 
   // close more handles
   __imp_SetConsoleCtrlHandler((void *)sys_execve_nt_event, 1);
-  PurgeThread(g_fds.stdin.thread);
-  PurgeHandle(g_fds.stdin.reader);
-  PurgeHandle(g_fds.stdin.writer);
   for (i = 0; i < g_fds.n; ++i) {
     if (g_fds.p[i].kind != kFdEmpty) {
       PurgeHandle(g_fds.p[i].handle);
diff --git a/libc/proc/execve-sysv.c b/libc/proc/execve-sysv.c
index 6120edec8..3bfdcda2d 100644
--- a/libc/proc/execve-sysv.c
+++ b/libc/proc/execve-sysv.c
@@ -58,8 +58,7 @@ static bool IsApeFile(const char *path) {
     return true;
   } else {
     bool res = false;
-    BLOCK_CANCELLATIONS;
-    BEGIN_CANCELLATION_POINT;
+    BLOCK_SIGNALS;
     int fd;
     char buf[8];
     int flags = O_RDONLY | O_NOCTTY | O_NONBLOCK | O_CLOEXEC;
@@ -67,8 +66,7 @@ static bool IsApeFile(const char *path) {
       res = sys_pread(fd, buf, 8, 0, 0) == 8 && IsApeLoadable(buf);
       sys_close(fd);
     }
-    END_CANCELLATION_POINT;
-    ALLOW_CANCELLATIONS;
+    ALLOW_SIGNALS;
     return res;
   }
 }
diff --git a/libc/calls/fexecve.c b/libc/proc/fexecve.c
similarity index 100%
rename from libc/calls/fexecve.c
rename to libc/proc/fexecve.c
diff --git a/libc/proc/fork-nt.c b/libc/proc/fork-nt.c
index 4d51c4a8b..afb77dc39 100644
--- a/libc/proc/fork-nt.c
+++ b/libc/proc/fork-nt.c
@@ -199,10 +199,7 @@ textwindows void WinMainForked(void) {
   char16_t fvar[21 + 1 + 21 + 1];
   uint32_t i, varlen, oldprot, savepid;
   long mapcount, mapcapacity, specialz;
-
-  struct StdinRelay stdin;
   struct Fds *fds = __veil("r", &g_fds);
-  stdin = fds->stdin;
 
   // check to see if the process was actually forked
   // this variable should have the pipe handle numba
@@ -282,7 +279,6 @@ textwindows void WinMainForked(void) {
 
   // rewrap the stdin named pipe hack
   // since the handles closed on fork
-  fds->stdin = stdin;
   fds->p[0].handle = GetStdHandle(kNtStdInputHandle);
   fds->p[1].handle = GetStdHandle(kNtStdOutputHandle);
   fds->p[2].handle = GetStdHandle(kNtStdErrorHandle);
diff --git a/libc/proc/kill-nt.c b/libc/proc/kill-nt.c
index df9d73e84..d99ab28ba 100644
--- a/libc/proc/kill-nt.c
+++ b/libc/proc/kill-nt.c
@@ -18,11 +18,14 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/calls.h"
 #include "libc/errno.h"
+#include "libc/intrin/atomic.h"
 #include "libc/intrin/dll.h"
 #include "libc/nt/errors.h"
 #include "libc/nt/runtime.h"
 #include "libc/proc/proc.internal.h"
 #include "libc/sysv/errfuns.h"
+#include "libc/thread/thread.h"
+#include "libc/thread/tls.h"
 #ifdef __x86_64__
 
 static textwindows int sys_kill_nt_impl(int pid, int sig) {
@@ -50,7 +53,6 @@ static textwindows int sys_kill_nt_impl(int pid, int sig) {
 }
 
 textwindows int sys_kill_nt(int pid, int sig) {
-  int rc;
   if (!(0 <= sig && sig <= 64)) return einval();
 
   // XXX: NT doesn't really have process groups. For instance the
@@ -66,9 +68,14 @@ textwindows int sys_kill_nt(int pid, int sig) {
     return raise(sig);
   }
 
+  int rc;
+  uint64_t m;
+  m = atomic_exchange(&__get_tls()->tib_sigmask, -1);
   __proc_lock();
+  pthread_cleanup_push((void *)__proc_unlock, 0);
   rc = sys_kill_nt_impl(pid, sig);
-  __proc_unlock();
+  pthread_cleanup_pop(true);
+  atomic_store_explicit(&__get_tls()->tib_sigmask, m, memory_order_release);
 
   return rc;
 }
diff --git a/libc/calls/mkntcmdline.c b/libc/proc/mkntcmdline.c
similarity index 100%
rename from libc/calls/mkntcmdline.c
rename to libc/proc/mkntcmdline.c
diff --git a/libc/calls/mkntenvblock.c b/libc/proc/mkntenvblock.c
similarity index 100%
rename from libc/calls/mkntenvblock.c
rename to libc/proc/mkntenvblock.c
diff --git a/libc/proc/proc.c b/libc/proc/proc.c
index 4565e8b90..9a4308297 100644
--- a/libc/proc/proc.c
+++ b/libc/proc/proc.c
@@ -144,7 +144,7 @@ textwindows struct Proc *__proc_new(void) {
   struct Dll *e;
   struct Proc *proc = 0;
   int i, n = ARRAYLEN(__proc.pool);
-  if (atomic_load_explicit(&__proc.allocated, memory_order_relaxed) < n &&
+  if (atomic_load_explicit(&__proc.allocated, memory_order_acquire) < n &&
       (i = atomic_fetch_add(&__proc.allocated, 1)) < n) {
     proc = __proc.pool + i;
   } else {
diff --git a/libc/proc/wait4-nt.c b/libc/proc/wait4-nt.c
index 47a7e688b..6a738f734 100644
--- a/libc/proc/wait4-nt.c
+++ b/libc/proc/wait4-nt.c
@@ -26,6 +26,7 @@
 #include "libc/cosmo.h"
 #include "libc/errno.h"
 #include "libc/fmt/conv.h"
+#include "libc/intrin/atomic.h"
 #include "libc/intrin/dll.h"
 #include "libc/intrin/strace.internal.h"
 #include "libc/macros.internal.h"
@@ -38,6 +39,7 @@
 #include "libc/str/str.h"
 #include "libc/sysv/consts/w.h"
 #include "libc/sysv/errfuns.h"
+#include "libc/thread/thread.h"
 #include "libc/thread/tls.h"
 
 #ifdef __x86_64__
@@ -98,7 +100,7 @@ static textwindows int CheckZombies(int pid, int *wstatus,
 }
 
 static textwindows int WaitForProcess(int pid, int *wstatus, int options,
-                                      struct rusage *opt_out_rusage) {
+                                      struct rusage *rusage, uint64_t *m) {
   int rc, *wv;
   nsync_cv *cv;
   struct Dll *e;
@@ -106,7 +108,7 @@ static textwindows int WaitForProcess(int pid, int *wstatus, int options,
   struct timespec deadline = timespec_zero;
 
   // check list of processes that've already exited
-  if ((rc = CheckZombies(pid, wstatus, opt_out_rusage))) {
+  if ((rc = CheckZombies(pid, wstatus, rusage))) {
     return rc;
   }
 
@@ -139,16 +141,16 @@ CheckForInterrupt:
   if (_check_interrupts(kSigOpRestartable) == -1) return -1;
   deadline = GetNextDeadline(deadline);
 SpuriousWakeup:
-  BEGIN_BLOCKING_OPERATION;
   ++*wv;
+  atomic_store_explicit(&__get_tls()->tib_sigmask, *m, memory_order_release);
   rc = nsync_cv_wait_with_deadline(cv, &__proc.lock, deadline, 0);
+  *m = atomic_exchange(&__get_tls()->tib_sigmask, -1);
   --*wv;
-  END_BLOCKING_OPERATION;
   if (rc == ECANCELED) return ecanceled();
-  if (pr && pr->iszombie) return ReapZombie(pr, wstatus, opt_out_rusage);
+  if (pr && pr->iszombie) return ReapZombie(pr, wstatus, rusage);
   if (rc == ETIMEDOUT) goto CheckForInterrupt;
   unassert(!rc);
-  if (!pr && (rc = CheckZombies(pid, wstatus, opt_out_rusage))) return rc;
+  if (!pr && (rc = CheckZombies(pid, wstatus, rusage))) return rc;
   goto SpuriousWakeup;
 }
 
@@ -163,9 +165,12 @@ textwindows int sys_wait4_nt(int pid, int *opt_out_wstatus, int options,
   //      just does an "ignore ctrl-c" internally.
   if (pid == 0) pid = -1;
   if (pid < -1) pid = -pid;
+  uint64_t m = atomic_exchange(&__get_tls()->tib_sigmask, -1);
   __proc_lock();
-  rc = WaitForProcess(pid, opt_out_wstatus, options, opt_out_rusage);
-  __proc_unlock();
+  pthread_cleanup_push((void *)__proc_unlock, 0);
+  rc = WaitForProcess(pid, opt_out_wstatus, options, opt_out_rusage, &m);
+  pthread_cleanup_pop(true);
+  atomic_store_explicit(&__get_tls()->tib_sigmask, m, memory_order_release);
   return rc;
 }
 
diff --git a/libc/runtime/enable_tls.c b/libc/runtime/enable_tls.c
index a82569643..77f1bef2f 100644
--- a/libc/runtime/enable_tls.c
+++ b/libc/runtime/enable_tls.c
@@ -17,7 +17,6 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "ape/sections.internal.h"
-#include "libc/assert.h"
 #include "libc/calls/syscall-sysv.internal.h"
 #include "libc/dce.h"
 #include "libc/errno.h"
@@ -120,8 +119,8 @@ textstartup void __enable_tls(void) {
   //     _tbss_start + _tbss_size:
   //     _tdata_start + _tls_size:
   //
-  unassert(_tbss_start == _tdata_start + I(_tbss_offset));
-  unassert(_tbss_start + I(_tbss_size) == _tdata_start + I(_tls_size));
+  // unassert(_tbss_start == _tdata_start + I(_tbss_offset));
+  // unassert(_tbss_start + I(_tbss_size) == _tdata_start + I(_tls_size));
 
 #ifdef __x86_64__
 
@@ -136,10 +135,7 @@ textstartup void __enable_tls(void) {
     // malloc() being linked, which links _mapanon().  otherwise
     // if you exceed this, you need to __static_yoink("_mapanon").
     // please note that it's probably too early to call calloc()
-    npassert(_weaken(_mapanon));
-    siz = ROUNDUP(siz, FRAMESIZE);
     mem = _weaken(_mapanon)(siz);
-    npassert(mem);
   }
 
   if (IsAsan()) {
@@ -158,10 +154,7 @@ textstartup void __enable_tls(void) {
   if (siz <= sizeof(__static_tls)) {
     mem = __static_tls;
   } else {
-    npassert(_weaken(_mapanon));
-    siz = ROUNDUP(siz, FRAMESIZE);
     mem = _weaken(_mapanon)(siz);
-    npassert(mem);
   }
 
   if (IsAsan()) {
@@ -221,7 +214,9 @@ textstartup void __enable_tls(void) {
   _pthread_list = &_pthread_static.list;
   atomic_store_explicit(&_pthread_static.ptid, tid, memory_order_relaxed);
   if (IsWindows()) {
-    npassert((_pthread_static.semaphore = CreateSemaphore(0, 0, 1, 0)));
+    if (!(_pthread_static.semaphore = CreateSemaphore(0, 0, 1, 0))) {
+      notpossible;
+    }
   }
 
   // copy in initialized data section
diff --git a/libc/runtime/ftraceinit.greg.c b/libc/runtime/ftraceinit.greg.c
index 74717a415..96c9e33bc 100644
--- a/libc/runtime/ftraceinit.greg.c
+++ b/libc/runtime/ftraceinit.greg.c
@@ -18,6 +18,7 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/runtime/internal.h"
 #include "libc/runtime/runtime.h"
+#include "libc/runtime/symbols.internal.h"
 #include "libc/str/str.h"
 #include "libc/thread/tls.h"
 
@@ -36,6 +37,9 @@ __static_yoink("zipos");
  * @see libc/runtime/_init.S for documentation
  */
 textstartup int ftrace_init(void) {
+  if (strace_enabled(0) > 0) {
+    GetSymbolTable();
+  }
   if (__intercept_flag(&__argc, __argv, "--ftrace")) {
     ftrace_install();
     ftrace_enabled(+1);
diff --git a/libc/runtime/getdosargv.c b/libc/runtime/getdosargv.c
index 97f58911e..7f1313cf8 100644
--- a/libc/runtime/getdosargv.c
+++ b/libc/runtime/getdosargv.c
@@ -87,8 +87,8 @@ static textwindows int Count(int c, struct DosArgv *st) {
 // @see test/libc/dosarg_test.c
 // @see libc/runtime/ntspawn.c
 // @note kudos to Simon Tatham for figuring out quoting behavior
-textwindows int GetDosArgv(const char16_t *cmdline, char *buf,
-                                    size_t size, char **argv, size_t max) {
+textwindows int GetDosArgv(const char16_t *cmdline, char *buf, size_t size,
+                           char **argv, size_t max) {
   bool inquote;
   int i, argc, slashes, quotes, ignore;
   static struct DosArgv st_;
@@ -107,32 +107,6 @@ textwindows int GetDosArgv(const char16_t *cmdline, char *buf,
     if (!st->wc) break;
     if (++argc < max) {
       argv[argc - 1] = st->p < st->pe ? st->p : NULL;
-      if (argc == 1) {
-        // windows lets you run "foo.com" without saying "./foo.com"
-        // which caused emacs to crash after searching for itself :(
-        char16_t cmd[256];
-        uint32_t i, j, attr;
-        i = j = 0;
-        cmd[j++] = st->wc;
-        for (; st->s[i]; ++i) {
-          if (i == 255 || st->s[i] == '/' || st->s[i] == '\\') {
-            goto GiveUpAddingDotSlash;
-          }
-          if (st->s[i] == ' ' || st->s[i] == '\t') {
-            break;
-          }
-          cmd[j++] = st->s[i];
-        }
-        cmd[j] = 0;
-        if (IsWindows() &&                                    //
-            (attr = __imp_GetFileAttributesW(cmd)) != -1u &&  //
-            !(attr & kNtFileAttributeDirectory)) {
-          AppendDosArgv('.', st);
-          AppendDosArgv('\\', st);
-        }
-      GiveUpAddingDotSlash:
-        donothing;
-      }
     }
     inquote = false;
     while (st->wc) {
diff --git a/libc/runtime/mmap.c b/libc/runtime/mmap.c
index e7afe843c..ea026ef25 100644
--- a/libc/runtime/mmap.c
+++ b/libc/runtime/mmap.c
@@ -157,9 +157,9 @@ static bool __auto_map(int count, int align, int *res) {
          *res + count <= FRAME(kAutomapStart + (kAutomapSize - 1));
 }
 
-static void *__finish_memory(void *addr, size_t size, int prot,
-                                      int flags, int fd, int64_t off, int f,
-                                      int x, int n, struct DirectMap dm) {
+static void *__finish_memory(void *addr, size_t size, int prot, int flags,
+                             int fd, int64_t off, int f, int x, int n,
+                             struct DirectMap dm) {
   if (!IsWindows() && (flags & MAP_FIXED)) {
     if (__untrack_memories(addr, size)) {
       __mmap_die("FIXED UNTRACK FAILED");
@@ -178,8 +178,8 @@ static void *__finish_memory(void *addr, size_t size, int prot,
   return addr;
 }
 
-static void *__map_memory(void *addr, size_t size, int prot, int flags,
-                                   int fd, int64_t off, int f, int x, int n) {
+static void *__map_memory(void *addr, size_t size, int prot, int flags, int fd,
+                          int64_t off, int f, int x, int n) {
   struct DirectMap dm;
   dm = sys_mmap(addr, size, prot, f, fd, off);
   if (VERY_UNLIKELY(dm.addr == MAP_FAILED)) {
@@ -200,9 +200,10 @@ static void *__map_memory(void *addr, size_t size, int prot, int flags,
  * This is useful on Windows since it allows us to partially unmap or
  * punch holes into existing mappings.
  */
-static textwindows dontinline void *__map_memories(
-    char *addr, size_t size, int prot, int flags, int fd, int64_t off, int f,
-    int x, int n) {
+static textwindows dontinline void *__map_memories(char *addr, size_t size,
+                                                   int prot, int flags, int fd,
+                                                   int64_t off, int f, int x,
+                                                   int n) {
   size_t i, m;
   int64_t oi, sz;
   struct DirectMap dm;
@@ -238,8 +239,8 @@ static textwindows dontinline void *__map_memories(
   return addr;
 }
 
-inline void *__mmap_unlocked(void *addr, size_t size, int prot,
-                                      int flags, int fd, int64_t off) {
+inline void *__mmap_unlocked(void *addr, size_t size, int prot, int flags,
+                             int fd, int64_t off) {
   char *p = addr;
   struct DirectMap dm;
   size_t requested_size;
@@ -480,3 +481,5 @@ void *mmap(void *addr, size_t size, int prot, int flags, int fd, int64_t off) {
          toto);
   return res;
 }
+
+__strong_reference(mmap, mmap64);
diff --git a/libc/runtime/runtime.h b/libc/runtime/runtime.h
index edfb47eb9..963b2a89b 100644
--- a/libc/runtime/runtime.h
+++ b/libc/runtime/runtime.h
@@ -93,6 +93,7 @@ void __printargs(const char *);
 int ftrace_install(void);
 int ftrace_enabled(int);
 int strace_enabled(int);
+bool strace_enter(void);
 void _bt(const char *, ...);
 void __print_maps(void);
 long _GetMaxFd(void);
@@ -141,6 +142,15 @@ long __get_minsigstksz(void) pureconst;
 void __get_main_stack(void **, size_t *, int *);
 long __get_safe_size(long, long);
 char *__get_tmpdir(void);
+__funline int __trace_disabled(int x) {
+  return 0;
+}
+#ifndef FTRACE
+#define ftrace_enabled __trace_disabled
+#endif
+#ifndef SYSDEBUG
+#define strace_enabled __trace_disabled
+#endif
 #endif /* _COSMO_SOURCE */
 
 COSMOPOLITAN_C_END_
diff --git a/libc/runtime/set_tls.c b/libc/runtime/set_tls.c
index 3cabed830..9faebba57 100644
--- a/libc/runtime/set_tls.c
+++ b/libc/runtime/set_tls.c
@@ -20,7 +20,6 @@
 #include "libc/calls/calls.h"
 #include "libc/calls/syscall-sysv.internal.h"
 #include "libc/dce.h"
-#include "libc/errno.h"
 #include "libc/nexgen32e/msr.internal.h"
 #include "libc/nt/thread.h"
 #include "libc/sysv/consts/arch.h"
@@ -49,9 +48,7 @@ textstartup void __set_tls(struct CosmoTib *tib) {
     sys_set_tls(tib);
   } else if (IsXnu()) {
     // thread_fast_set_cthread_self has a weird ABI
-    int e = errno;
     sys_set_tls((intptr_t)tib - 0x30);
-    errno = e;
   } else {
     uint64_t val = (uint64_t)tib;
     asm volatile("wrmsr"
diff --git a/libc/runtime/syslib.internal.h b/libc/runtime/syslib.internal.h
index 7942ad6ce..de3cc8a4e 100644
--- a/libc/runtime/syslib.internal.h
+++ b/libc/runtime/syslib.internal.h
@@ -12,7 +12,7 @@ COSMOPOLITAN_C_START_
  */
 
 #define SYSLIB_MAGIC   ('s' | 'l' << 8 | 'i' << 16 | 'b' << 24)
-#define SYSLIB_VERSION 3
+#define SYSLIB_VERSION 4
 
 typedef uint64_t dispatch_time_t;
 typedef uint64_t dispatch_semaphore_t;
@@ -49,6 +49,16 @@ struct Syslib {
   int (*__pthread_attr_destroy)(void *);
   int (*__pthread_attr_setstacksize)(void *, size_t);
   int (*__pthread_attr_setguardsize)(void *, size_t);
+  /* v4 (2023-09-19) */
+  void (*__exit)(int);
+  long (*__close)(int);
+  long (*__munmap)(void *, size_t);
+  long (*__openat)(int, const void *, int, int);
+  long (*__write)(int, const void *, size_t);
+  long (*__read)(int, void *, size_t);
+  long (*__sigaction)(int, const void *, void *);
+  long (*__pselect)(int, void *, void *, void *, const void *, const void *);
+  long (*__mprotect)(void *, size_t, int);
 };
 
 extern struct Syslib *__syslib;
diff --git a/libc/runtime/winargs.internal.h b/libc/runtime/winargs.internal.h
index 065d04bc8..b854fba61 100644
--- a/libc/runtime/winargs.internal.h
+++ b/libc/runtime/winargs.internal.h
@@ -6,10 +6,11 @@ COSMOPOLITAN_C_START_
 
 struct WinArgs {
   char *argv[4096];
-  char *envp[4092];
+  char *envp[4060];
   intptr_t auxv[2][2];
   char argblock[ARG_MAX / 2];
   char envblock[ARG_MAX / 2];
+  char argv0buf[256];
 };
 
 COSMOPOLITAN_C_END_
diff --git a/libc/runtime/winmain.greg.c b/libc/runtime/winmain.greg.c
index c33199965..e06a6f000 100644
--- a/libc/runtime/winmain.greg.c
+++ b/libc/runtime/winmain.greg.c
@@ -19,6 +19,7 @@
 #include "libc/assert.h"
 #include "libc/calls/internal.h"
 #include "libc/calls/syscall_support-nt.internal.h"
+#include "libc/intrin/bits.h"
 #include "libc/intrin/weaken.h"
 #include "libc/limits.h"
 #include "libc/log/libfatal.internal.h"
@@ -145,6 +146,12 @@ static abi wontreturn void WinInit(const char16_t *cmdline) {
     }
   }
 
+  // avoid programs like emacs nagging the user to define this
+  char16_t var[8];
+  if (!__imp_GetEnvironmentVariableW(u"TERM", var, 8)) {
+    __imp_SetEnvironmentVariableW(u"TERM", u"xterm-256color");
+  }
+
   // allocate memory for stack and argument block
   _Static_assert(sizeof(struct WinArgs) % FRAMESIZE == 0, "");
   _mmi.p = _mmi.s;
@@ -173,6 +180,21 @@ static abi wontreturn void WinInit(const char16_t *cmdline) {
   int count = GetDosArgv(cmdline, wa->argblock, ARRAYLEN(wa->argblock),
                          wa->argv, ARRAYLEN(wa->argv));
 
+  // normalize executable path
+  if (wa->argv[0] && !WinFileExists(wa->argv[0])) {
+    unsigned i, n = 0;
+    while (wa->argv[0][n]) ++n;
+    if (n + 4 < sizeof(wa->argv0buf)) {
+      for (i = 0; i < n; ++i) {
+        wa->argv0buf[i] = wa->argv[0][i];
+      }
+      WRITE32LE(wa->argv0buf + i, READ32LE(".com"));
+      if (WinFileExists(wa->argv0buf)) {
+        wa->argv[0] = wa->argv0buf;
+      }
+    }
+  }
+
   // munge argv so dos paths become cosmo paths
   for (int i = 0; wa->argv[i]; ++i) {
     if (wa->argv[i][0] == '\\' &&  //
diff --git a/libc/sock/pselect.c b/libc/sock/pselect.c
index 538a3ddc7..2f04ca9d1 100644
--- a/libc/sock/pselect.c
+++ b/libc/sock/pselect.c
@@ -28,6 +28,7 @@
 #include "libc/intrin/strace.internal.h"
 #include "libc/sock/internal.h"
 #include "libc/sock/select.h"
+#include "libc/sock/select.internal.h"
 #include "libc/sysv/consts/nrlinux.h"
 #include "libc/sysv/errfuns.h"
 
@@ -68,6 +69,15 @@ int pselect(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
   } ss;
   BEGIN_CANCELLATION_POINT;
 
+#ifdef SYSDEBUG
+  fd_set old_readfds;
+  fd_set *old_readfds_ptr = 0;
+  fd_set old_writefds;
+  fd_set *old_writefds_ptr = 0;
+  fd_set old_exceptfds;
+  fd_set *old_exceptfds_ptr = 0;
+#endif
+
   if (nfds < 0) {
     rc = einval();
   } else if (IsAsan() &&
@@ -77,33 +87,55 @@ int pselect(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
               (timeout && !__asan_is_valid(timeout, sizeof(*timeout))) ||
               (sigmask && !__asan_is_valid(sigmask, sizeof(*sigmask))))) {
     rc = efault();
-  } else if (IsLinux()) {
-    if (timeout) {
-      ts = *timeout;
-      tsp = &ts;
-    } else {
-      tsp = 0;
-    }
-    ss.s = sigmask;
-    ss.n = 8;
-    rc = sys_pselect(nfds, readfds, writefds, exceptfds, tsp, &ss);
-  } else if (!IsWindows()) {
-    rc = sys_pselect(nfds, readfds, writefds, exceptfds,
-                     (struct timespec *)timeout, sigmask);
   } else {
-    if (timeout) {
-      tv.tv_sec = timeout->tv_sec;
-      tv.tv_usec = timeout->tv_nsec / 1000;
-      tvp = &tv;
-    } else {
-      tvp = 0;
+#ifdef SYSDEBUG
+    if (readfds) {
+      old_readfds = *readfds;
+      old_readfds_ptr = &old_readfds;
+    }
+    if (writefds) {
+      old_writefds = *writefds;
+      old_writefds_ptr = &old_writefds;
+    }
+    if (exceptfds) {
+      old_exceptfds = *exceptfds;
+      old_exceptfds_ptr = &old_exceptfds;
+    }
+#endif
+    if (IsLinux()) {
+      if (timeout) {
+        ts = *timeout;
+        tsp = &ts;
+      } else {
+        tsp = 0;
+      }
+      ss.s = sigmask;
+      ss.n = 8;
+      rc = sys_pselect(nfds, readfds, writefds, exceptfds, tsp, &ss);
+    } else if (!IsWindows()) {
+      rc = sys_pselect(nfds, readfds, writefds, exceptfds,
+                       (struct timespec *)timeout, sigmask);
+    } else {
+      if (timeout) {
+        tv.tv_sec = timeout->tv_sec;
+        tv.tv_usec = timeout->tv_nsec / 1000;
+        tvp = &tv;
+      } else {
+        tvp = 0;
+      }
+      rc = sys_select_nt(nfds, readfds, writefds, exceptfds, tvp, sigmask);
     }
-    rc = sys_select_nt(nfds, readfds, writefds, exceptfds, tvp, sigmask);
   }
 
   END_CANCELLATION_POINT;
-  POLLTRACE("pselect(%d, %p, %p, %p, %s, %s) → %d% m", nfds, readfds, writefds,
-            exceptfds, DescribeTimespec(0, timeout), DescribeSigset(0, sigmask),
-            rc);
+  STRACE("pselect(%d, %s → [%s], %s → [%s], %s → [%s], %s, %s) → %d% m", nfds,
+         DescribeFdSet(rc, nfds, old_readfds_ptr),
+         DescribeFdSet(rc, nfds, readfds),
+         DescribeFdSet(rc, nfds, old_writefds_ptr),
+         DescribeFdSet(rc, nfds, writefds),
+         DescribeFdSet(rc, nfds, old_exceptfds_ptr),
+         DescribeFdSet(rc, nfds, exceptfds),  //
+         DescribeTimespec(0, timeout),        //
+         DescribeSigset(0, sigmask), rc);
   return rc;
 }
diff --git a/libc/sock/select-nt.c b/libc/sock/select-nt.c
index 72bf4f100..276dfb646 100644
--- a/libc/sock/select-nt.c
+++ b/libc/sock/select-nt.c
@@ -16,10 +16,12 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/assert.h"
 #include "libc/calls/bo.internal.h"
 #include "libc/calls/internal.h"
 #include "libc/calls/state.internal.h"
 #include "libc/calls/struct/timeval.h"
+#include "libc/limits.h"
 #include "libc/macros.internal.h"
 #include "libc/sock/select.h"
 #include "libc/sock/sock.h"
@@ -34,11 +36,10 @@
 int sys_select_nt(int nfds, fd_set *readfds, fd_set *writefds,
                   fd_set *exceptfds, struct timeval *timeout,
                   const sigset_t *sigmask) {
-  uint64_t millis;
   int i, pfds, events, fdcount;
-  struct pollfd fds[64];
 
   // convert bitsets to pollfd
+  struct pollfd fds[64];
   for (pfds = i = 0; i < nfds; ++i) {
     events = 0;
     if (readfds && FD_ISSET(i, readfds)) events |= POLLIN;
@@ -57,26 +58,49 @@ int sys_select_nt(int nfds, fd_set *readfds, fd_set *writefds,
   }
 
   // convert the wait time to a word
+  uint32_t millis;
   if (!timeout) {
     millis = -1;
   } else {
-    millis = timeval_tomillis(*timeout);
+    int64_t ms = timeval_tomillis(*timeout);
+    if (ms < 0 || ms > UINT32_MAX) {
+      millis = -1u;
+    } else {
+      millis = ms;
+    }
   }
 
   // call our nt poll implementation
   BEGIN_BLOCKING_OPERATION;
   fdcount = sys_poll_nt(fds, pfds, &millis, sigmask);
+  unassert(fdcount < 64);
   END_BLOCKING_OPERATION;
-  if (fdcount == -1) return -1;
+  if (fdcount < 0) return -1;
 
   // convert pollfd back to bitsets
   if (readfds) FD_ZERO(readfds);
   if (writefds) FD_ZERO(writefds);
   if (exceptfds) FD_ZERO(exceptfds);
-  for (i = 0; i < fdcount; ++i) {
-    if (fds[i].revents & POLLIN) FD_SET(fds[i].fd, readfds);
-    if (fds[i].revents & POLLOUT) FD_SET(fds[i].fd, writefds);
-    if (fds[i].revents & (POLLERR | POLLNVAL)) FD_SET(fds[i].fd, exceptfds);
+  int bits = 0;
+  for (i = 0; i < pfds; ++i) {
+    if (fds[i].revents & POLLIN) {
+      if (readfds) {
+        FD_SET(fds[i].fd, readfds);
+        ++bits;
+      }
+    }
+    if (fds[i].revents & POLLOUT) {
+      if (writefds) {
+        FD_SET(fds[i].fd, writefds);
+        ++bits;
+      }
+    }
+    if (fds[i].revents & (POLLERR | POLLNVAL)) {
+      if (exceptfds) {
+        FD_SET(fds[i].fd, exceptfds);
+        ++bits;
+      }
+    }
   }
 
   // store remaining time back in caller's timeval
@@ -84,7 +108,7 @@ int sys_select_nt(int nfds, fd_set *readfds, fd_set *writefds,
     *timeout = timeval_frommillis(millis);
   }
 
-  return fdcount;
+  return bits;
 }
 
 #endif /* __x86_64__ */
diff --git a/libc/sock/select.c b/libc/sock/select.c
index fab5f6b89..6c2ba0f0d 100644
--- a/libc/sock/select.c
+++ b/libc/sock/select.c
@@ -27,6 +27,8 @@
 #include "libc/intrin/describeflags.internal.h"
 #include "libc/intrin/strace.internal.h"
 #include "libc/sock/internal.h"
+#include "libc/sock/select.h"
+#include "libc/sock/select.internal.h"
 #include "libc/sysv/errfuns.h"
 
 /**
@@ -88,7 +90,8 @@ int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
   }
   END_CANCELLATION_POINT;
 
-  POLLTRACE("select(%d, %p, %p, %p, [%s]) → %d% m", nfds, readfds, writefds,
-            exceptfds, DescribeTimeval(rc, tvp), rc);
+  STRACE("select(%d, [%s], [%s], [%s], [%s]) → %d% m", nfds,
+         DescribeFdSet(rc, nfds, readfds), DescribeFdSet(rc, nfds, writefds),
+         DescribeFdSet(rc, nfds, exceptfds), DescribeTimeval(rc, tvp), rc);
   return rc;
 }
diff --git a/libc/sock/select.internal.h b/libc/sock/select.internal.h
new file mode 100644
index 000000000..a1d767372
--- /dev/null
+++ b/libc/sock/select.internal.h
@@ -0,0 +1,13 @@
+#ifndef COSMOPOLITAN_LIBC_SOCK_SELECT_INTERNAL_H_
+#define COSMOPOLITAN_LIBC_SOCK_SELECT_INTERNAL_H_
+#include "libc/mem/alloca.h"
+#include "libc/sock/select.h"
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+COSMOPOLITAN_C_START_
+
+const char *DescribeFdSet(char[100], ssize_t, int, fd_set *);
+#define DescribeFdSet(x, y, z) DescribeFdSet(alloca(100), x, y, z)
+
+COSMOPOLITAN_C_END_
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
+#endif /* COSMOPOLITAN_LIBC_SOCK_SELECT_INTERNAL_H_ */
diff --git a/libc/sock/sendfile.c b/libc/sock/sendfile.c
index 06ea84ec4..0991ece9c 100644
--- a/libc/sock/sendfile.c
+++ b/libc/sock/sendfile.c
@@ -219,3 +219,5 @@ ssize_t sendfile(int outfd, int infd, int64_t *opt_in_out_inoffset,
          DescribeInOutInt64(rc, opt_in_out_inoffset), uptobytes, rc);
   return rc;
 }
+
+__weak_reference(sendfile, sendfile64);
diff --git a/libc/sock/struct/pollfd.internal.h b/libc/sock/struct/pollfd.internal.h
index 673a3a7a4..adaec48cb 100644
--- a/libc/sock/struct/pollfd.internal.h
+++ b/libc/sock/struct/pollfd.internal.h
@@ -12,7 +12,7 @@ int32_t __sys_poll(struct pollfd *, uint64_t, signed);
 int sys_ppoll(struct pollfd *, size_t, const struct timespec *,
               const sigset_t *, size_t);
 int sys_poll_metal(struct pollfd *, size_t, unsigned);
-int sys_poll_nt(struct pollfd *, uint64_t, uint64_t *, const sigset_t *);
+int sys_poll_nt(struct pollfd *, uint64_t, uint32_t *, const sigset_t *);
 
 const char *DescribePollFds(char[300], ssize_t, struct pollfd *, size_t);
 #define DescribePollFds(x, y, z) DescribePollFds(alloca(300), x, y, z)
diff --git a/libc/sock/wsablock.c b/libc/sock/wsablock.c
index 361eb7369..24b9831ed 100644
--- a/libc/sock/wsablock.c
+++ b/libc/sock/wsablock.c
@@ -22,6 +22,7 @@
 #include "libc/calls/sig.internal.h"
 #include "libc/calls/struct/timespec.h"
 #include "libc/errno.h"
+#include "libc/intrin/weaken.h"
 #include "libc/nt/enum/wait.h"
 #include "libc/nt/enum/wsa.h"
 #include "libc/nt/errors.h"
@@ -113,6 +114,10 @@ BlockingOperation:
   if (WSAGetOverlappedResult(f->handle, overlapped, &got, nonblock, flags)) {
     rc = got;
   } else {
+    if (_weaken(pthread_testcancel_np) &&
+        (err = _weaken(pthread_testcancel_np)())) {
+      return ecanceled();
+    }
     rc = -1;
     err = WSAGetLastError();
     if (err == kNtErrorOperationAborted) {
diff --git a/libc/stdio/dirstream.c b/libc/stdio/dirstream.c
index c696481c3..bead6c70e 100644
--- a/libc/stdio/dirstream.c
+++ b/libc/stdio/dirstream.c
@@ -677,3 +677,4 @@ void seekdir(DIR *dir, long tell) {
 }
 
 __weak_reference(readdir, readdir64);
+__weak_reference(readdir_r, readdir_r64);
diff --git a/libc/sysv/consts.sh b/libc/sysv/consts.sh
index 342071111..cb66ccd64 100755
--- a/libc/sysv/consts.sh
+++ b/libc/sysv/consts.sh
@@ -396,9 +396,6 @@ syscon	fcntl	F_OFD_GETLK				36			36			-1			-1			-1			-1			-1			-1			# listed in
 syscon	fcntl	F_RDLCK					0			0			1			1			1			1			1			0			# polyfilled nt; bsd consensus
 syscon	fcntl	F_WRLCK					1			1			3			3			3			3			3			1			# polyfilled nt; bsd consensus
 syscon	fcntl	F_UNLCK					2			2			2			2			2			2			2			2			# polyfilled nt; unix consensus
-syscon	compat	F_SETLK64				6			6			8			8			12			8			8			6			# polyfilled nt
-syscon	compat	F_SETLKW64				7			7			9			9			13			9			9			7
-syscon	compat	F_GETLK64				5			5			7			7			11			7			7			5			# polyfilled nt
 
 syscon	fcntl	F_SETSIG				10			10			-1			-1			-1			-1			-1			-1
 syscon	fcntl	F_GETSIG				11			11			-1			-1			-1			-1			-1			-1
diff --git a/libc/sysv/consts/F_GETLK64.S b/libc/sysv/consts/F_GETLK64.S
deleted file mode 100644
index 05f78ee95..000000000
--- a/libc/sysv/consts/F_GETLK64.S
+++ /dev/null
@@ -1,2 +0,0 @@
-#include "libc/sysv/consts/syscon.internal.h"
-.syscon compat,F_GETLK64,5,5,7,7,11,7,7,5
diff --git a/libc/sysv/consts/F_SETLK64.S b/libc/sysv/consts/F_SETLK64.S
deleted file mode 100644
index 8ac643e3d..000000000
--- a/libc/sysv/consts/F_SETLK64.S
+++ /dev/null
@@ -1,2 +0,0 @@
-#include "libc/sysv/consts/syscon.internal.h"
-.syscon compat,F_SETLK64,6,6,8,8,12,8,8,6
diff --git a/libc/sysv/consts/F_SETLKW64.S b/libc/sysv/consts/F_SETLKW64.S
deleted file mode 100644
index 3981eba5d..000000000
--- a/libc/sysv/consts/F_SETLKW64.S
+++ /dev/null
@@ -1,2 +0,0 @@
-#include "libc/sysv/consts/syscon.internal.h"
-.syscon compat,F_SETLKW64,7,7,9,9,13,9,9,7
diff --git a/libc/sysv/consts/f.h b/libc/sysv/consts/f.h
index 7a466096b..8bf1d1b7f 100644
--- a/libc/sysv/consts/f.h
+++ b/libc/sysv/consts/f.h
@@ -15,14 +15,12 @@ extern const int F_FULLFSYNC;
 extern const int F_GETFD;
 extern const int F_GETFL;
 extern const int F_GETLEASE;
-extern const int F_GETLK64;
 extern const int F_GETLK;
 extern const int F_GETNOSIGPIPE;
 extern const int F_GETOWN;
 extern const int F_GETPATH;
 extern const int F_GETPIPE_SZ;
 extern const int F_GETSIG;
-extern const int F_LOCK;
 extern const int F_MAXFD;
 extern const int F_NOCACHE;
 extern const int F_NOTIFY;
@@ -33,9 +31,7 @@ extern const int F_RDLCK;
 extern const int F_SETFD;
 extern const int F_SETFL;
 extern const int F_SETLEASE;
-extern const int F_SETLK64;
 extern const int F_SETLK;
-extern const int F_SETLKW64;
 extern const int F_SETLKW;
 extern const int F_SETNOSIGPIPE;
 extern const int F_SETOWN;
@@ -61,14 +57,11 @@ COSMOPOLITAN_C_END_
  * posix advisory locks
  * polyfilled poorly on windows
  */
-#define F_SETLK    F_SETLK
-#define F_SETLK64  F_SETLK64
-#define F_SETLKW   F_SETLKW
-#define F_SETLKW64 F_SETLKW64
-#define F_GETLK    F_GETLK
-#define F_GETLK64  F_GETLK64
-#define F_RDLCK    F_RDLCK
-#define F_UNLCK    F_UNLCK
-#define F_WRLCK    F_WRLCK
+#define F_SETLK  F_SETLK
+#define F_SETLKW F_SETLKW
+#define F_GETLK  F_GETLK
+#define F_RDLCK  F_RDLCK
+#define F_UNLCK  F_UNLCK
+#define F_WRLCK  F_WRLCK
 
 #endif /* COSMOPOLITAN_LIBC_SYSV_CONSTS_F_H_ */
diff --git a/libc/thread/pthread_cancel.c b/libc/thread/pthread_cancel.c
index 14c54d8a0..66ab9c7d7 100644
--- a/libc/thread/pthread_cancel.c
+++ b/libc/thread/pthread_cancel.c
@@ -92,11 +92,7 @@ static void _pthread_cancel_sig(int sig, siginfo_t *si, void *arg) {
 
   // punts cancellation to start of next cancellation point
   // we ensure sigthr is a pending signal in case unblocked
-  if (IsXnuSilicon()) {
-    __syslib->__pthread_kill(_pthread_syshand(pt), sig);
-  } else {
-    sys_tkill(_pthread_tid(pt), sig, __get_tls());
-  }
+  raise(sig);
 }
 
 static void _pthread_cancel_listen(void) {
@@ -111,10 +107,7 @@ static void _pthread_cancel_listen(void) {
 
 static void pthread_cancel_nt(struct PosixThread *pt, intptr_t hThread) {
   uint32_t old_suspend_count;
-  if (!(pt->pt_flags & PT_NOCANCEL) &&
-      (pt->pt_flags & (PT_ASYNC | PT_MASKED))) {
-    pt->pt_flags |= PT_NOCANCEL;
-    pt->abort_errno = ECANCELED;
+  if (!(pt->pt_flags & PT_NOCANCEL)) {
     if ((pt->pt_flags & PT_ASYNC) &&
         (old_suspend_count = SuspendThread(hThread)) != -1u) {
       if (!old_suspend_count) {
@@ -125,13 +118,13 @@ static void pthread_cancel_nt(struct PosixThread *pt, intptr_t hThread) {
           cpu.Rdi = (uintptr_t)PTHREAD_CANCELED;
           cpu.Rsp &= -16;
           *(uintptr_t *)(cpu.Rsp -= sizeof(uintptr_t)) = cpu.Rip;
-          pt->abort_errno = ECANCELED;
           unassert(SetThreadContext(hThread, &cpu));
         }
       }
       ResumeThread(hThread);
     }
-    __sig_cancel(pt);
+    pt->abort_errno = ECANCELED;
+    __sig_cancel(pt, 0);
   }
 }
 
diff --git a/libc/thread/pthread_create.c b/libc/thread/pthread_create.c
index 2efd84fc7..275dfa5e8 100644
--- a/libc/thread/pthread_create.c
+++ b/libc/thread/pthread_create.c
@@ -39,6 +39,7 @@
 #include "libc/mem/mem.h"
 #include "libc/nexgen32e/crc32.h"
 #include "libc/nt/runtime.h"
+#include "libc/nt/synchronization.h"
 #include "libc/runtime/runtime.h"
 #include "libc/runtime/stack.h"
 #include "libc/runtime/syslib.internal.h"
@@ -149,6 +150,11 @@ static errno_t pthread_create_impl(pthread_t *thread,
   }
   pt->start = start_routine;
   pt->arg = arg;
+  if (IsWindows()) {
+    if (!(pt->semaphore = CreateSemaphore(0, 0, 1, 0))) {
+      notpossible;
+    }
+  }
 
   // create thread local storage memory
   if (!(pt->tls = _mktls(&pt->tib))) {
diff --git a/test/libc/calls/read_test.c b/test/libc/calls/read_test.c
index e0f67d551..a23255263 100644
--- a/test/libc/calls/read_test.c
+++ b/test/libc/calls/read_test.c
@@ -17,6 +17,7 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/assert.h"
+#include "libc/atomic.h"
 #include "libc/calls/calls.h"
 #include "libc/calls/cp.internal.h"
 #include "libc/calls/internal.h"
@@ -26,12 +27,14 @@
 #include "libc/calls/syscall-sysv.internal.h"
 #include "libc/dce.h"
 #include "libc/errno.h"
+#include "libc/runtime/runtime.h"
 #include "libc/sock/internal.h"
 #include "libc/sysv/consts/nr.h"
 #include "libc/sysv/consts/o.h"
 #include "libc/sysv/consts/sig.h"
 #include "libc/testlib/ezbench.h"
 #include "libc/testlib/testlib.h"
+#include "libc/thread/thread.h"
 
 void SetUpOnce(void) {
   testlib_enable_tmp_setup_teardown();
@@ -82,6 +85,57 @@ TEST(read_directory, eisdir) {
   ASSERT_SYS(0, 0, close(3));
 }
 
+int fds[2];
+jmp_buf jb;
+pthread_t th;
+atomic_bool isdone;
+
+void *GenerateSignals(void *arg) {
+  while (!isdone) {
+    usleep(123);
+    pthread_kill(th, SIGINT);
+  }
+  return 0;
+}
+
+void *GenerateData(void *arg) {
+  for (;;) {
+    usleep(223);
+    int rc = write(fds[1], "hi", 2);
+    if (rc == -1 && errno == EPIPE) break;
+    ASSERT_EQ(2, rc);
+  }
+  return 0;
+}
+
+void OnSig(int sig) {
+  char buf[8];
+  ASSERT_SYS(0, 2, read(fds[0], buf, 8));
+  longjmp(jb, 1);
+}
+
+TEST(read, whatEmacsDoes) {
+  pthread_t sigth;
+  sighandler_t sh1 = signal(SIGINT, SIG_IGN);
+  sighandler_t sh2 = signal(SIGPIPE, SIG_IGN);
+  ASSERT_SYS(0, 0, pipe(fds));
+  ASSERT_EQ(0, pthread_create(&th, 0, GenerateData, 0));
+  ASSERT_EQ(0, pthread_create(&sigth, 0, GenerateSignals, 0));
+  for (int i = 0; i < 100; ++i) {
+    if (!setjmp(jb)) {
+      char buf[8];
+      ASSERT_GE(read(fds[0], buf, 8), 2);
+    }
+  }
+  isdone = true;
+  ASSERT_SYS(0, 0, close(fds[0]));
+  ASSERT_EQ(0, pthread_join(sigth, 0));
+  ASSERT_EQ(0, pthread_join(th, 0));
+  ASSERT_SYS(0, 0, close(fds[1]));
+  signal(SIGPIPE, sh2);
+  signal(SIGINT, sh1);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 
 BENCH(read, bench) {
diff --git a/test/libc/runtime/getdosargv_test.c b/test/libc/runtime/getdosargv_test.c
index fb98edef9..b0b5c4572 100644
--- a/test/libc/runtime/getdosargv_test.c
+++ b/test/libc/runtime/getdosargv_test.c
@@ -25,11 +25,6 @@
 #include "libc/testlib/testlib.h"
 
 void SetUpOnce(void) {
-  if (!IsWindows()) {
-    // TODO(jart): mock out that win32 i/o call
-    tinyprint(2, program_invocation_name, ": skipping on non-windows\n", NULL);
-    exit(0);
-  }
   testlib_enable_tmp_setup_teardown();
 }
 
@@ -197,16 +192,3 @@ TEST(GetDosArgv, cmdToil) {
   free(argv);
   free(buf);
 }
-
-TEST(GetDosArgv, canonicalizesCurrentDirectoryCommandPath) {
-  size_t max = 4;
-  size_t size = ARG_MAX / 2;
-  char *buf = malloc(size * sizeof(char));
-  char **argv = malloc(max * sizeof(char *));
-  ASSERT_SYS(0, 0, touch("emacs.com", 0755));
-  EXPECT_EQ(1, GetDosArgv(u"emacs.com", buf, size, argv, max));
-  EXPECT_STREQ(".\\emacs.com", argv[0]);
-  EXPECT_EQ(NULL, argv[1]);
-  free(argv);
-  free(buf);
-}
diff --git a/test/libc/thread/pthread_cancel_test.c b/test/libc/thread/pthread_cancel_test.c
index 11e8fa011..a3dbdaeaa 100644
--- a/test/libc/thread/pthread_cancel_test.c
+++ b/test/libc/thread/pthread_cancel_test.c
@@ -32,6 +32,7 @@
 #include "libc/thread/thread2.h"
 
 int pfds[2];
+atomic_bool ready;
 pthread_cond_t cv;
 pthread_mutex_t mu;
 atomic_int gotcleanup;
@@ -72,6 +73,7 @@ TEST(pthread_cancel, self_deferred_waitsForCancellationPoint) {
 
 void *Worker(void *arg) {
   char buf[8];
+  ready = true;
   pthread_cleanup_push(OnCleanup, 0);
   read(pfds[0], buf, sizeof(buf));
   pthread_cleanup_pop(0);
@@ -91,11 +93,12 @@ TEST(pthread_cancel, synchronous) {
   ASSERT_SYS(0, 0, close(pfds[0]));
 }
 
-TEST(pthread_cancel, synchronous_delayed) {
+TEST(pthread_cancel, synchronous_deferred) {
   void *rc;
   pthread_t th;
   ASSERT_SYS(0, 0, pipe(pfds));
   ASSERT_EQ(0, pthread_create(&th, 0, Worker, 0));
+  while (!ready) pthread_yield();
   ASSERT_SYS(0, 0, usleep(10));
   EXPECT_EQ(0, pthread_cancel(th));
   EXPECT_EQ(0, pthread_join(th, &rc));
diff --git a/third_party/musl/lockf.c b/third_party/musl/lockf.c
index 8d729554e..6ee23fe1d 100644
--- a/third_party/musl/lockf.c
+++ b/third_party/musl/lockf.c
@@ -25,13 +25,13 @@
 │  SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                      │
 │                                                                              │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "third_party/musl/lockf.h"
 #include "libc/calls/calls.h"
 #include "libc/calls/struct/flock.h"
 #include "libc/calls/weirdtypes.h"
 #include "libc/errno.h"
 #include "libc/sysv/consts/f.h"
 #include "libc/sysv/errfuns.h"
-#include "third_party/musl/lockf.h"
 
 asm(".ident\t\"\\n\\n\
 Musl libc (MIT License)\\n\
@@ -68,3 +68,5 @@ int lockf(int fd, int op, off_t size)
 	}
 	return einval();
 }
+
+__weak_reference(lockf, lockf64);
diff --git a/tool/build/runit.c b/tool/build/runit.c
index e75e03823..6fcd2c3c3 100644
--- a/tool/build/runit.c
+++ b/tool/build/runit.c
@@ -122,6 +122,9 @@ long g_backoff;
 char *g_runitd;
 jmp_buf g_jmpbuf;
 uint16_t g_sshport;
+int connect_latency;
+int execute_latency;
+int handshake_latency;
 char g_hostname[128];
 uint16_t g_runitdport;
 volatile bool alarmed;
@@ -174,6 +177,7 @@ void Connect(void) {
   LOGIFNEG1(sigaction(SIGALRM, &(struct sigaction){.sa_handler = OnAlarm}, 0));
   DEBUGF("connecting to %s (%hhu.%hhu.%hhu.%hhu) to run %s", g_hostname, ip4[0],
          ip4[1], ip4[2], ip4[3], g_prog);
+  struct timespec start = timespec_real();
 TryAgain:
   alarmed = false;
   LOGIFNEG1(setitimer(
@@ -199,6 +203,7 @@ TryAgain:
   }
   setitimer(ITIMER_REAL, &(const struct itimerval){0}, 0);
   freeaddrinfo(ai);
+  connect_latency = timespec_tomicros(timespec_sub(timespec_real(), start));
 }
 
 bool Send(int tmpfd, const void *output, size_t outputsize) {
@@ -309,6 +314,7 @@ bool Recv(char *p, int n) {
 
 int ReadResponse(void) {
   int exitcode;
+  struct timespec start = timespec_real();
   for (;;) {
     char msg[5];
     if (!Recv(msg, 5)) {
@@ -351,6 +357,7 @@ int ReadResponse(void) {
       break;
     }
   }
+  execute_latency = timespec_tomicros(timespec_sub(timespec_real(), start));
   close(g_sock);
   return exitcode;
 }
@@ -373,7 +380,9 @@ int RunOnHost(char *spec) {
   for (;;) {
     Connect();
     EzFd(g_sock);
+    struct timespec start = timespec_real();
     err = EzHandshake2();
+    handshake_latency = timespec_tomicros(timespec_sub(timespec_real(), start));
     if (!err) break;
     WARNF("handshake with %s:%d failed -0x%04x (%s)",  //
           g_hostname, g_runitdport, err, GetTlsError(err));
@@ -381,7 +390,10 @@ int RunOnHost(char *spec) {
     return 1;
   }
   RelayRequest();
-  return ReadResponse();
+  int rc = ReadResponse();
+  kprintf("%s on %-16s %'11d µs %'8ld µs %'8ld µs\n", basename(g_prog),
+          g_hostname, execute_latency, connect_latency, handshake_latency);
+  return rc;
 }
 
 bool IsParallelBuild(void) {
diff --git a/tool/build/runitd.c b/tool/build/runitd.c
index da37e5b4e..e1a677d25 100644
--- a/tool/build/runitd.c
+++ b/tool/build/runitd.c
@@ -40,6 +40,7 @@
 #include "libc/mem/mem.h"
 #include "libc/nexgen32e/crc32.h"
 #include "libc/proc/posix_spawn.h"
+#include "libc/runtime/internal.h"
 #include "libc/runtime/runtime.h"
 #include "libc/runtime/syslib.internal.h"
 #include "libc/sock/sock.h"
@@ -488,7 +489,8 @@ void *ClientWorker(void *arg) {
   // condition can happen, where etxtbsy is raised by our execve
   // we're using o_cloexec so it's guaranteed to fix itself fast
   // thus we use an optimistic approach to avoid expensive locks
-  sprintf(client->tmpexepath, "o/%s.XXXXXX.com", basename(origname));
+  sprintf(client->tmpexepath, "o/%s.XXXXXX.com",
+          basename(stripext(gc(strdup(origname)))));
   int exefd = openatemp(AT_FDCWD, client->tmpexepath, 4, O_CLOEXEC, 0700);
   if (exefd == -1) {
     WARNF("%s failed to open temporary file %#s due to %m", addrstr,