cosmopolitan/libc/sock/recvfrom-nt.c
Justine Tunney 58352df0a4
Make forking off threads reliable on Windows
This change makes posix_spawn_test no longer flaky on Windows, by (1)
fixing a race condition in wait(), and (2) removing a misguided vfork
implementation which was letting Windows bypass pthread_atfork().
2023-07-30 09:32:41 -07:00

54 lines
3 KiB
C

/*-*- 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 2020 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/calls/internal.h"
#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"
#include "libc/sock/syscall_fd.internal.h"
#include "libc/sysv/errfuns.h"
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;
struct SockFd *sockfd;
struct NtIovec iovnt[16];
struct NtOverlapped overlapped = {.hEvent = WSACreateEvent()};
err = errno;
if (!WSARecvFrom(fd->handle, iovnt, __iovec2nt(iovnt, iov, iovlen), 0, &flags,
opt_out_srcaddr, opt_inout_srcaddrsize, &overlapped, NULL)) {
if (WSAGetOverlappedResult(fd->handle, &overlapped, &got, false, &flags)) {
rc = got;
} else {
rc = -1;
}
} else {
errno = err;
sockfd = (struct SockFd *)fd->extra;
rc = __wsablock(fd, &overlapped, &flags, kSigOpRestartable,
sockfd->rcvtimeo);
}
WSACloseEvent(overlapped.hEvent);
return rc;
}