Make fixes and improvements

- Introduce __assert_disable global
- Improve strsignal() thread safety
- Make system call tracing thread safe
- Fix SO_RCVTIMEO / SO_SNDTIMEO on Windows
- Refactor DescribeFoo() functions into one place
- Fix fork() on Windows when TLS and MAP_STACK exist
- Round upwards in setsockopt(SO_RCVTIMEO) on Windows
- Disable futexes on OpenBSD which seem extremely broken
- Implement a better kludge for monotonic time on Windows

libc/intrin/describesigset.c

@@ -0,0 +1,62 @@
+/*-*- 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/bits/popcnt.h"
+#include "libc/dce.h"
+#include "libc/intrin/asan.internal.h"
+#include "libc/intrin/describeflags.internal.h"
+#include "libc/intrin/kprintf.h"
+#include "libc/str/str.h"
+
+const char *(DescribeSigset)(char buf[64], int rc, const sigset_t *ss) {
+  bool gotsome;
+  int i, n, sig;
+  sigset_t sigset;
+
+  if (rc == -1) return "n/a";
+  if (!ss) return "NULL";
+  if ((!IsAsan() && kisdangerous(ss)) ||
+      (IsAsan() && !__asan_is_valid(ss, sizeof(*ss)))) {
+    ksnprintf(buf, 64, "%p", ss);
+    return buf;
+  }
+
+  i = 0;
+  n = 64;
+  sigset = *ss;
+  gotsome = false;
+  if (popcnt(sigset.__bits[0]) + popcnt(sigset.__bits[1]) > 64) {
+    i += ksnprintf(buf + i, n - i, "~");
+    sigset.__bits[0] = ~sigset.__bits[0];
+    sigset.__bits[1] = ~sigset.__bits[1];
+  }
+  i += ksnprintf(buf + i, n - i, "{");
+  for (sig = 1; sig < 128; ++sig) {
+    if (sigismember(&sigset, sig)) {
+      if (gotsome) {
+        sig += ksnprintf(buf + sig, n - sig, ", ");
+      } else {
+        gotsome = true;
+      }
+      sig += ksnprintf(buf + sig, n - sig, "%s", strsignal(sig));
+    }
+  }
+  i += ksnprintf(buf + i, n - i, "}");
+
+  return buf;
+}