Make numerous improvements

- Python static hello world now 1.8mb
- Python static fully loaded now 10mb
- Python HTTPS client now uses MbedTLS
- Python REPL now completes import stmts
- Increase stack size for Python for now
- Begin synthesizing posixpath and ntpath
- Restore Python \N{UNICODE NAME} support
- Restore Python NFKD symbol normalization
- Add optimized code path for Intel SHA-NI
- Get more Python unit tests passing faster
- Get Python help() pagination working on NT
- Python hashlib now supports MbedTLS PBKDF2
- Make memcpy/memmove/memcmp/bcmp/etc. faster
- Add Mersenne Twister and Vigna to LIBC_RAND
- Provide privileged __printf() for error code
- Fix zipos opendir() so that it reports ENOTDIR
- Add basic chmod() implementation for Windows NT
- Add Cosmo's best functions to Python cosmo module
- Pin function trace indent depth to that of caller
- Show memory diagram on invalid access in MODE=dbg
- Differentiate stack overflow on crash in MODE=dbg
- Add stb_truetype and tools for analyzing font files
- Upgrade to UNICODE 13 and reduce its binary footprint
- COMPILE.COM now logs resource usage of build commands
- Start implementing basic poll() support on bare metal
- Set getauxval(AT_EXECFN) to GetModuleFileName() on NT
- Add descriptions to strerror() in non-TINY build modes
- Add COUNTBRANCH() macro to help with micro-optimizations
- Make error / backtrace / asan / memory code more unbreakable
- Add fast perfect C implementation of μ-Law and a-Law audio codecs
- Make strtol() functions consistent with other libc implementations
- Improve Linenoise implementation (see also github.com/jart/bestline)
- COMPILE.COM now suppresses stdout/stderr of successful build commands

libc/calls/openat-sysv.c

@@ -17,6 +17,7 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/internal.h"
+#include "libc/calls/sysdebug.internal.h"
 #include "libc/dce.h"
 #include "libc/errno.h"
 #include "libc/sysv/consts/f.h"
@@ -32,7 +33,7 @@ int sys_openat(int dirfd, const char *file, int flags, unsigned mode) {
    * flag. Other times, it return -530 which makes no sense.
    */
   if (!IsLinux() || !(flags & O_CLOEXEC) || modernize) {
-    return __sys_openat(dirfd, file, flags, mode);
+    d = __sys_openat(dirfd, file, flags, mode);
   } else if (once) {
     if ((d = __sys_openat(dirfd, file, flags & ~O_CLOEXEC, mode)) != -1) {
       e = errno;
@@ -54,8 +55,13 @@ int sys_openat(int dirfd, const char *file, int flags, unsigned mode) {
       once = true;
     } else if (errno > 255) {
       once = true;
-      return sys_openat(dirfd, file, flags, mode);
+      d = sys_openat(dirfd, file, flags, mode);
     }
   }
+  if (d != -1) {
+    SYSDEBUG("sys_openat(0x%x, %s, %d, %d) -> %d", dirfd, file, flags, mode, d);
+  } else {
+    SYSDEBUG("sys_openat(0x%x, %s, %d, %d) -> %m", dirfd, file, flags, mode);
+  }
   return d;
 }