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/sock/recvfrom-nt.c

@@ -17,6 +17,7 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/struct/iovec.h"
+#include "libc/errno.h"
 #include "libc/nt/struct/overlapped.h"
 #include "libc/nt/winsock.h"
 #include "libc/sock/internal.h"
@@ -33,17 +34,22 @@ textwindows ssize_t sys_recvfrom_nt(struct Fd *fd, const struct iovec *iov,
                                     size_t iovlen, uint32_t flags,
                                     void *opt_out_srcaddr,
                                     uint32_t *opt_inout_srcaddrsize) {
+  int err;
   ssize_t rc;
   uint32_t got = 0;
+  struct SockFd *sockfd;
   struct NtIovec iovnt[16];
   struct NtOverlapped overlapped = {.hEvent = WSACreateEvent()};
   if (_check_interrupts(true, g_fds.p)) return eintr();
+  err = errno;
   if (!WSARecvFrom(fd->handle, iovnt, __iovec2nt(iovnt, iov, iovlen), &got,
                    &flags, opt_out_srcaddr, opt_inout_srcaddrsize, &overlapped,
                    NULL)) {
     rc = got;
   } else {
-    rc = __wsablock(fd->handle, &overlapped, &flags, true);
+    errno = err;
+    sockfd = (struct SockFd *)fd->extra;
+    rc = __wsablock(fd->handle, &overlapped, &flags, true, sockfd->rcvtimeo);
   }
   WSACloseEvent(overlapped.hEvent);
   return rc;