Improve redbean ctrl-c handling

third_party/linenoise/linenoise.c

@@ -580,8 +580,9 @@ static char abGrow(struct abuf *a, int need) {
   int cap;
   char *b;
   cap = a->cap;
-  do cap += cap / 2;
-  while (cap < need);
+  do {
+    cap += cap / 2;
+  } while (cap < need);
   if (!(b = realloc(a->b, cap * sizeof(*a->b)))) return 0;
   a->cap = cap;
   a->b = b;
@@ -824,8 +825,9 @@ static char linenoiseGrow(struct linenoiseState *ls, size_t n) {
   size_t m;
   m = ls->buflen;
   if (m >= n) return 1;
-  do m += m >> 1;
-  while (m < n);
+  do {
+    m += m >> 1;
+  } while (m < n);
   if (!(p = realloc(ls->buf, m * sizeof(*ls->buf)))) return 0;
   ls->buf = p;
   ls->buflen = m;
@@ -855,8 +857,9 @@ static size_t Forward(struct linenoiseState *l, size_t pos) {
 
 static size_t Backward(struct linenoiseState *l, size_t pos) {
   if (pos) {
-    do --pos;
-    while (pos && (l->buf[pos] & 0300) == 0200);
+    do {
+      --pos;
+    } while (pos && (l->buf[pos] & 0300) == 0200);
   }
   return pos;
 }
@@ -1461,8 +1464,9 @@ static size_t EscapeWord(struct linenoiseState *l) {
       if (iswseparator(r.c)) break;
     }
     if ((j = i)) {
-      do --j;
-      while (j && (l->buf[j] & 0300) == 0200);
+      do {
+        --j;
+      } while (j && (l->buf[j] & 0300) == 0200);
       r = GetUtf8(l->buf + j, l->len - j);
       if (iswseparator(r.c)) break;
     }
@@ -1477,8 +1481,9 @@ static void linenoiseEditLeft(struct linenoiseState *l) {
 
 static void linenoiseEditRight(struct linenoiseState *l) {
   if (l->pos == l->len) return;
-  do l->pos++;
-  while (l->pos < l->len && (l->buf[l->pos] & 0300) == 0200);
+  do {
+    l->pos++;
+  } while (l->pos < l->len && (l->buf[l->pos] & 0300) == 0200);
   linenoiseRefreshLine(l);
 }
 
@@ -2268,6 +2273,7 @@ char *linenoiseRaw(const char *prompt, int infd, int outfd) {
     buf = 0;
     raise(gotint);
     errno = EINTR;
+    gotint = 0;
     rc = -1;
   }
   if (rc != -1) {

tool/build/jail.c

@@ -17,9 +17,13 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/calls.h"
+#include "libc/calls/sigbits.h"
 #include "libc/calls/struct/filter.h"
 #include "libc/calls/struct/sigaction.h"
+#include "libc/calls/struct/siginfo.h"
+#include "libc/calls/struct/sigset.h"
 #include "libc/calls/struct/user_regs_struct.h"
+#include "libc/calls/ucontext.h"
 #include "libc/dce.h"
 #include "libc/errno.h"
 #include "libc/intrin/kprintf.h"
@@ -28,6 +32,7 @@
 #include "libc/runtime/runtime.h"
 #include "libc/sysv/consts/pr.h"
 #include "libc/sysv/consts/ptrace.h"
+#include "libc/sysv/consts/sa.h"
 #include "libc/sysv/consts/sig.h"
 #include "tool/net/sandbox.h"
 
@@ -75,6 +80,7 @@ static const struct sock_filter kSandboxFilter[] = {
     _SECCOMP_ALLOW_SYSCALL(0x033),        // getsockname
     _SECCOMP_ALLOW_SYSCALL(0x034),        // getpeername
     _SECCOMP_ALLOW_SYSCALL(0x00f),        // rt_sigreturn
+    _SECCOMP_ALLOW_SYSCALL(0x082),        // rt_sigsuspend
     _SECCOMP_ALLOW_SYSCALL(0x0e4),        // clock_gettime
     _SECCOMP_ALLOW_SYSCALL(0x060),        // gettimeofday
     _SECCOMP_ALLOW_SYSCALL(0x03f),        // uname
@@ -110,7 +116,12 @@ static const struct sock_fprog kSandbox = {
     .filter = kSandboxFilter,
 };
 
+void OnSys(int sig, siginfo_t *si, ucontext_t *ctx) {
+  kprintf("Got SIGSYS%n");
+}
+
 int main(int argc, char *argv[]) {
+  sigset_t mask, origmask;
   struct user_regs_struct regs;
   int child, evpid, signal, wstatus;
 
@@ -122,30 +133,68 @@ int main(int argc, char *argv[]) {
     kprintf("Usage: %s PROGRAM [ARGS...]%n", argv[0]);
     return 1;
   }
-  ShowCrashReports();
-
-  CHECK_NE(-1, (child = fork()));
-  if (!child) {
-    if (ptrace(PTRACE_TRACEME) == -1) _Exit(124);
-    if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) == -1) _Exit(125);
-    if (prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &kSandbox) == -1) _Exit(126);
-    execvp(argv[1], argv + 1);
-    _Exit(127);
-  }
+  /* ShowCrashReports(); */
 
   sigaction(SIGINT, &(struct sigaction){.sa_handler = SIG_IGN}, 0);
   sigaction(SIGQUIT, &(struct sigaction){.sa_handler = SIG_IGN}, 0);
+  sigaction(SIGSYS,
+            &((struct sigaction){
+                .sa_sigaction = OnSys,
+                .sa_flags = SA_SIGINFO,
+            }),
+            0);
+
+  sigemptyset(&mask);
+  sigaddset(&mask, SIGCHLD);
+  sigprocmask(SIG_BLOCK, &mask, &origmask);
+
+  CHECK_NE(-1, (child = fork()));
+  if (!child) {
+    sigaction(SIGINT, &(struct sigaction){.sa_handler = SIG_DFL}, 0);
+    sigaction(SIGQUIT, &(struct sigaction){.sa_handler = SIG_DFL}, 0);
+    kprintf("CHILD ptrace(PTRACE_TRACEME)%n");
+    if (ptrace(PTRACE_TRACEME) == -1) {
+      kprintf("CHILD ptrace(PTRACE_TRACEME) failed %m%n");
+      _Exit(124);
+    }
+    kprintf("CHILD prctl(PR_SET_NO_NEW_PRIVS)%n");
+    if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) == -1) {
+      kprintf("CHILD prctl(PR_SET_NO_NEW_PRIVS) failed %m%n");
+      _Exit(125);
+    }
+    kprintf("CHILD prctl(PR_SET_SECCOMP)%n");
+    if (prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &kSandbox) == -1) {
+      kprintf("CHILD prctl(PR_SET_SECCOMP) failed %m%n");
+      _Exit(126);
+    }
+    kprintf("CHILD sigsuspend()%n");
+    if (sigsuspend(0) == -1) {
+      kprintf("CHILD sigsuspend() failed %m%n");
+    }
+    sigaction(SIGSYS, &(struct sigaction){.sa_handler = SIG_DFL}, 0);
+    sigprocmask(SIG_SETMASK, &origmask, 0);
+    execv(argv[1], argv + 1);
+    kprintf("CHILD execve(%#s) failed %m%n", argv[1]);
+    _Exit(127);
+  }
 
   // wait for ptrace(PTRACE_TRACEME) to be called
+  kprintf("PARENT waitpid(child, &wstatus)%n");
   CHECK_EQ(child, waitpid(child, &wstatus, 0));
 
   // configure linux process tracing
+  kprintf("PARENT ptrace(PTRACE_SETOPTIONS)%n");
   CHECK_NE(-1, ptrace(PTRACE_SETOPTIONS, child, 0, PTRACE_O_TRACESECCOMP));
 
   // continue child process
+  kprintf("PARENT ptrace(PTRACE_CONT)%n");
   CHECK_NE(-1, ptrace(PTRACE_CONT, child, 0, 0));
 
+  kprintf("PARENT kill(child, SIGSYS)%n");
+  kill(child, SIGSYS);
+
   for (;;) {
+    kprintf("PARENT waitpid()%n");
     CHECK_NE(-1, (evpid = waitpid(-1, &wstatus, __WALL)));
     if (WIFSTOPPED(wstatus)) {
       signal = (wstatus >> 8) & 0xffff;

tool/net/redbean.c

@@ -6986,13 +6986,26 @@ static int EventLoop(int fd, int ms) {
 
 static void ReplEventLoop(void) {
   int status;
+  long double t;
   lua_State *L = GL;
   polls[0].fd = 0;
   __nomultics = 2;
   __replmode = true;
   lua_initrepl("redbean");
   linenoiseSetPollCallback(EventLoop);
-  while ((status = lua_loadline(L)) != -1) {
+  for (;;) {
+    if ((status = lua_loadline(L)) == -1) {
+      if (errno = EINTR) {
+        LockInc(&shared->c.pollinterrupts);
+        if (terminated) {
+          break;
+        } else {
+          continue;
+        }
+      } else {
+        break;
+      }
+    }
     if (status == LUA_OK) {
       status = lua_runchunk(L, 0, LUA_MULTRET);
     }