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/clock_gettime.c

@@ -40,13 +40,18 @@
  * @asyncsignalsafe
  */
 int clock_gettime(int clockid, struct timespec *ts) {
-  int rc;
+  int rc, e;
   axdx_t ad;
-  if (!ts) return efault();
-  if (IsAsan() && !__asan_is_valid(ts, sizeof(*ts))) return efault();
-  if (clockid == -1) return einval();
-  if (!IsWindows()) {
-    if ((rc = sys_clock_gettime(clockid, ts)) == -1 && errno == ENOSYS) {
+  if (!ts) {
+    rc = efault();
+  } else if (IsAsan() && !__asan_is_valid(ts, sizeof(*ts))) {
+    rc = efault();
+  } else if (clockid == -1) {
+    rc = einval();
+  } else if (!IsWindows()) {
+    e = errno;
+    if ((rc = sys_clock_gettime(clockid, ts))) {
+      errno = e;
       ad = sys_gettimeofday((struct timeval *)ts, NULL, NULL);
       assert(ad.ax != -1);
       if (SupportsXnu() && ad.ax) {
@@ -56,8 +61,9 @@ int clock_gettime(int clockid, struct timespec *ts) {
       ts->tv_nsec *= 1000;
       rc = 0;
     }
-    return rc;
   } else {
-    return sys_clock_gettime_nt(clockid, ts);
+    rc = sys_clock_gettime_nt(clockid, ts);
   }
+  /* TODO(jart): Add get_clock_gettime() so we can STRACE() */
+  return rc;
 }