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/testlib/testrunner.c

@@ -19,14 +19,17 @@
 #include "libc/bits/weaken.h"
 #include "libc/calls/calls.h"
 #include "libc/calls/internal.h"
+#include "libc/calls/struct/sigaction.h"
 #include "libc/errno.h"
 #include "libc/fmt/fmt.h"
 #include "libc/log/check.h"
+#include "libc/log/libfatal.internal.h"
 #include "libc/macros.internal.h"
 #include "libc/nt/process.h"
 #include "libc/runtime/runtime.h"
 #include "libc/runtime/symbols.internal.h"
 #include "libc/stdio/stdio.h"
+#include "libc/sysv/consts/sig.h"
 #include "libc/testlib/testlib.h"
 #include "libc/x/x.h"
 
@@ -48,8 +51,12 @@ wontreturn void testlib_abort(void) {
 }
 
 static void SetupTmpDir(void) {
-  snprintf(g_testlib_tmpdir, sizeof(g_testlib_tmpdir), "o/tmp/%s.%d.%d",
-           program_invocation_short_name, getpid(), x++);
+  char *p = g_testlib_tmpdir;
+  p = __stpcpy(p, "o/tmp/");
+  p = __stpcpy(p, program_invocation_short_name), *p++ = '.';
+  p = __intcpy(p, __getpid()), *p++ = '.';
+  p = __intcpy(p, x++);
+  p[0] = '\0';
   CHECK_NE(-1, makedirs(g_testlib_tmpdir, 0755), "%s", g_testlib_tmpdir);
   CHECK_EQ(1, isdirectory(g_testlib_tmpdir), "%s", g_testlib_tmpdir);
   CHECK_NOTNULL(realpath(g_testlib_tmpdir, g_testlib_tmpdir), "%`'s",