mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 03:53:33 +00:00
3f0bcdc3ef
- Exhaustively document cancellation points - Rename SIGCANCEL to SIGTHR just like BSDs - Further improve POSIX thread cancellations - Ensure asynchronous cancellations work correctly - Elevate the quality of getrandom() and getentropy() - Make futexes cancel correctly on OpenBSD 6.x and 7.x - Add reboot.com and shutdown.com to examples directory - Remove underscore prefix from awesome timespec_*() APIs - Create assertions that help verify our cancellation points - Remove bad timespec APIs (cmp generalizes eq/ne/gt/gte/lt/lte)
65 lines
3.3 KiB
C
65 lines
3.3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 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/cp.internal.h"
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#include "libc/calls/internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/sock/internal.h"
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#include "libc/sock/sock.h"
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#include "libc/sock/struct/sockaddr.h"
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#include "libc/sock/struct/sockaddr.internal.h"
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#include "libc/sock/syscall_fd.internal.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Creates client socket file descriptor for incoming connection.
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*
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* @param fd is the server socket file descriptor
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* @param out_addr will receive the remote address
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* @param inout_addrsize provides and receives out_addr's byte length
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* @param flags can have SOCK_{CLOEXEC,NONBLOCK}, which may apply to
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* both the newly created socket and the server one
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* @return client fd which needs close(), or -1 w/ errno
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* @cancellationpoint
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* @asyncsignalsafe
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* @restartable (unless SO_RCVTIMEO)
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*/
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int accept4(int fd, struct sockaddr *out_addr, uint32_t *inout_addrsize,
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int flags) {
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int rc;
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char addrbuf[72];
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BEGIN_CANCELLATION_POINT;
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if (!out_addr || !inout_addrsize ||
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(IsAsan() && !__asan_is_valid(out_addr, *inout_addrsize))) {
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rc = efault();
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} else if (!IsWindows()) {
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rc = sys_accept4(fd, out_addr, inout_addrsize, flags);
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} else if (__isfdkind(fd, kFdSocket)) {
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rc = sys_accept_nt(&g_fds.p[fd], out_addr, inout_addrsize, flags);
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} else {
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rc = ebadf();
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}
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END_CANCELLATION_POINT;
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STRACE("accept4(%d, [%s]) -> %d% lm", fd,
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DescribeSockaddr(out_addr, inout_addrsize ? *inout_addrsize : 0), rc);
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return rc;
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}
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