Make improvements

- Fix build flakes
- Polyfill SIGWINCH on Windows
- Fix an execve issue on Windows
- Make strerror show more information
- Improve cmd.exe setup/teardown on Windows
- Support bracketed paste mode in Blinkenlights
- Show keyboard shortcuts in Blinkenlights status bar
- Fixed copy_file_range() and copyfile() w/ zip filesystem
- Size optimize GetDosArgv() to keep life.com 12kb in size
- Improve Blinkenlights ability to load weird ELF executables
- Fix program_executable_name and add GetInterpreterExecutableName
- Make Python in tiny mode fail better if docstrings are requested
- Update Python test exclusions in tiny* modes such as tinylinux
- Add bulletproof unbreakable kprintf() troubleshooting function
- Remove "oldskool" keyword from ape.S for virus scanners
- Fix issue that caused backtraces to not print sometimes
- Improve Blinkenlights serial uart character i/o
- Make clock_gettime() not clobber errno on xnu
- Improve sha256 cpuid check for old computers
- Integrate some bestline linenoise fixes
- Show runit process names better in htop
- Remove SIGPIPE from ShowCrashReports()
- Make realpath() not clobber errno
- Avoid attaching GDB on non-Linux
- Improve img.com example

libc/calls/sigwinch-nt.c

@@ -0,0 +1,58 @@
+/*-*- 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/calls/calls.h"
+#include "libc/calls/internal.h"
+#include "libc/calls/struct/winsize.h"
+#include "libc/calls/sysdebug.internal.h"
+#include "libc/errno.h"
+#include "libc/nt/struct/consolescreenbufferinfoex.h"
+#include "libc/str/str.h"
+
+static struct winsize __ws;
+
+textwindows bool _check_sigwinch(struct Fd *fd) {
+  int e;
+  siginfo_t si;
+  struct winsize ws, old;
+  struct NtConsoleScreenBufferInfoEx sbinfo;
+  old = __ws;
+  if (old.ws_row != 0xffff) {
+    e = errno;
+    if (ioctl_tiocgwinsz_nt(fd, &ws) != -1) {
+      if (old.ws_col != ws.ws_col || old.ws_row != ws.ws_row) {
+        __ws = ws;
+        if (old.ws_col | old.ws_row) {
+          SYSDEBUG("SIGWINCH %hhu×%hhu → %hhu×%hhu", old.ws_col, old.ws_row,
+                   ws.ws_col, ws.ws_row);
+          if (__sighandrvas[SIGWINCH] >= kSigactionMinRva) {
+            bzero(&si, sizeof(si));
+            ((sigaction_f)(_base + __sighandrvas[SIGWINCH]))(SIGWINCH, &si, 0);
+            return true;
+          }
+        }
+      }
+    } else {
+      errno = e;
+      if (!old.ws_row && !old.ws_col) {
+        __ws.ws_row = 0xffff;
+      }
+    }
+  }
+  return false;
+}