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https://github.com/jart/cosmopolitan.git
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87a6669900
This change makes send() / sendto() always block on Windows. It's needed because poll(POLLOUT) doesn't guarantee a socket is immediately writable on Windows, and it caused rsync to fail because it made that assumption. The only exception is when a SO_SNDTIMEO is specified which will EAGAIN. Tests are added confirming MSG_WAITALL and MSG_NOSIGNAL work as expected on all our supported OSes. Most of the platform-specific MSG_FOO magnums have been deleted, with the exception of MSG_FASTOPEN. Your --strace log will now show MSG_FOO flags as symbols rather than numbers. I've also removed cv_wait_example_test because it's 0.3% flaky with Qemu under system load since it depends on a process being readily scheduled.
72 lines
3.7 KiB
C
72 lines
3.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2023 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/iovec.h"
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#include "libc/calls/struct/sigset.internal.h"
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#include "libc/intrin/fds.h"
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#include "libc/nt/struct/iovec.h"
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#include "libc/nt/winsock.h"
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#include "libc/sock/internal.h"
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#include "libc/sock/struct/sockaddr.h"
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#include "libc/sock/syscall_fd.internal.h"
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#include "libc/sysv/consts/msg.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/errfuns.h"
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#ifdef __x86_64__
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#define _MSG_OOB 1
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#define _MSG_PEEK 2
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#define _MSG_DONTWAIT 64
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struct RecvFromArgs {
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const struct iovec *iov;
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size_t iovlen;
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void *opt_out_srcaddr;
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uint32_t *opt_inout_srcaddrsize;
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struct NtIovec iovnt[16];
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};
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textwindows static int sys_recvfrom_nt_start(int64_t handle,
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struct NtOverlapped *overlap,
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uint32_t *flags, void *arg) {
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struct RecvFromArgs *args = arg;
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return WSARecvFrom(
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handle, args->iovnt, __iovec2nt(args->iovnt, args->iov, args->iovlen), 0,
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flags, args->opt_out_srcaddr, args->opt_inout_srcaddrsize, overlap, 0);
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}
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textwindows ssize_t sys_recvfrom_nt(int fd, const struct iovec *iov,
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size_t iovlen, uint32_t flags,
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void *opt_out_srcaddr,
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uint32_t *opt_inout_srcaddrsize) {
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if (flags & ~(_MSG_DONTWAIT | _MSG_OOB | _MSG_PEEK))
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return einval();
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ssize_t rc;
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struct Fd *f = g_fds.p + fd;
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sigset_t waitmask = __sig_block();
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rc = __winsock_block(f->handle, flags & ~_MSG_DONTWAIT,
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(f->flags & O_NONBLOCK) || (flags & _MSG_DONTWAIT),
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f->rcvtimeo, waitmask, sys_recvfrom_nt_start,
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&(struct RecvFromArgs){iov, iovlen, opt_out_srcaddr,
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opt_inout_srcaddrsize});
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__sig_unblock(waitmask);
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return rc;
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}
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#endif /* __x86_64__ */
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