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

tool/build/lib/time.c

@@ -18,7 +18,9 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/calls.h"
 #include "libc/nexgen32e/rdtsc.h"
+#include "libc/sock/sock.h"
 #include "libc/sysv/consts/clock.h"
+#include "libc/sysv/consts/poll.h"
 #include "libc/time/time.h"
 #include "tool/build/lib/endian.h"
 #include "tool/build/lib/modrm.h"
@@ -29,7 +31,19 @@
  */
 
 void OpPause(struct Machine *m, uint32_t rde) {
-  sched_yield();
+  struct pollfd pf;
+  static bool once, interactive;
+  if (!once) {
+    interactive = isatty(0);
+    once = true;
+  }
+  if (!IsWindows() && interactive) {
+    pf.fd = 0;
+    pf.events = POLLIN;
+    poll(&pf, 1, 20); /* make spin loops less brutal */
+  } else {
+    sched_yield();
+  }
 }
 
 void OpRdtsc(struct Machine *m, uint32_t rde) {