mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 06:53:33 +00:00
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.
106 lines
4.8 KiB
C
106 lines
4.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│ vi: set et 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/cp.internal.h"
|
|
#include "libc/calls/internal.h"
|
|
#include "libc/calls/struct/iovec.h"
|
|
#include "libc/calls/struct/iovec.internal.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/intrin/describeflags.h"
|
|
#include "libc/intrin/strace.h"
|
|
#include "libc/nt/winsock.h"
|
|
#include "libc/sock/internal.h"
|
|
#include "libc/sock/sock.h"
|
|
#include "libc/sock/struct/sockaddr.h"
|
|
#include "libc/sock/struct/sockaddr.internal.h"
|
|
#include "libc/sock/syscall_fd.internal.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
/**
|
|
* Receives data from network.
|
|
*
|
|
* This function blocks unless MSG_DONTWAIT is passed. In that case, the
|
|
* non-error EWOULDBLOCK might be returned. It basically means we didn't
|
|
* wait around to learn an amount of bytes were written that we know in
|
|
* advance are guaranteed to be atomic.
|
|
*
|
|
* @param fd is the file descriptor returned by socket()
|
|
* @param buf is where received network data gets copied
|
|
* @param size is the byte capacity of buf
|
|
* @param flags can have `MSG_OOB`, `MSG_PEEK`, and `MSG_DONTWAIT`
|
|
* @param opt_out_srcaddr receives the binary ip:port of the data's origin
|
|
* @param opt_inout_srcaddrsize is srcaddr capacity which gets updated
|
|
* @return number of bytes received, 0 on remote close, or -1 w/ errno
|
|
* @error EINTR, EHOSTUNREACH, ECONNRESET (UDP ICMP Port Unreachable),
|
|
* EPIPE (if MSG_NOSIGNAL), EMSGSIZE, ENOTSOCK, EFAULT, etc.
|
|
* @cancelationpoint
|
|
* @asyncsignalsafe
|
|
* @restartable (unless SO_RCVTIMEO on Linux or Windows)
|
|
*/
|
|
ssize_t recvfrom(int fd, void *buf, size_t size, int flags,
|
|
struct sockaddr *opt_out_srcaddr,
|
|
uint32_t *opt_inout_srcaddrsize) {
|
|
ssize_t rc;
|
|
struct sockaddr_storage addr = {0};
|
|
uint32_t addrsize = sizeof(addr);
|
|
BEGIN_CANCELATION_POINT;
|
|
|
|
if (fd < g_fds.n && g_fds.p[fd].kind == kFdZip) {
|
|
rc = enotsock();
|
|
} else if (!IsWindows()) {
|
|
rc = sys_recvfrom(fd, buf, size, flags, &addr, &addrsize);
|
|
} else if (__isfdopen(fd)) {
|
|
if (__isfdkind(fd, kFdSocket)) {
|
|
rc = sys_recvfrom_nt(fd, (struct iovec[]){{buf, size}}, 1, flags, &addr,
|
|
&addrsize);
|
|
if (rc != -1 && addrsize == sizeof(addr)) {
|
|
addrsize = 0;
|
|
}
|
|
} else if (__isfdkind(fd, kFdFile) && !opt_out_srcaddr) { /* socketpair */
|
|
if (!flags) {
|
|
rc = sys_read_nt(fd, (struct iovec[]){{buf, size}}, 1, -1);
|
|
} else {
|
|
rc = einval();
|
|
}
|
|
} else {
|
|
rc = enotsock();
|
|
}
|
|
} else {
|
|
rc = ebadf();
|
|
}
|
|
|
|
if (rc != -1) {
|
|
if (addrsize) {
|
|
if (IsBsd()) {
|
|
__convert_bsd_to_sockaddr(&addr);
|
|
}
|
|
__write_sockaddr(&addr, opt_out_srcaddr, opt_inout_srcaddrsize);
|
|
} else {
|
|
*opt_inout_srcaddrsize = 0;
|
|
}
|
|
}
|
|
|
|
END_CANCELATION_POINT;
|
|
DATATRACE(
|
|
"recvfrom(%d, [%#.*hhs%s], %'zu, %s, %s) → %'ld% lm", fd,
|
|
MAX(0, MIN(40, rc)), buf, rc > 40 ? "..." : "", size, DescribeMsg(flags),
|
|
DescribeSockaddr(opt_out_srcaddr,
|
|
opt_inout_srcaddrsize ? *opt_inout_srcaddrsize : 0),
|
|
rc);
|
|
return rc;
|
|
}
|