mirror of
https://github.com/jart/cosmopolitan.git
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56 lines
3.3 KiB
C
56 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 et 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/assert.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.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.internal.h"
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#include "libc/sysv/consts/f.h"
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#include "libc/sysv/consts/fd.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/sock.h"
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#include "libc/sysv/errfuns.h"
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int sys_accept4(int server, struct sockaddr_storage *addr, int flags) {
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uint32_t size = sizeof(*addr);
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int olderr, client, file_mode;
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olderr = errno;
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client = __sys_accept4(server, addr, &size, flags);
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if (client == -1 && errno == ENOSYS) {
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// XNU/RHEL5/etc. don't support accept4(), but it's easilly polyfilled
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errno = olderr;
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if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
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return einval();
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if ((client = __sys_accept(server, addr, &size, 0)) != -1) {
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// __sys_accept() has inconsistent flag inheritance across platforms
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// this is one of the issues that accept4() was invented for solving
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unassert((file_mode = __sys_fcntl(client, F_GETFD)) != -1);
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unassert(!__sys_fcntl(client, F_SETFD,
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((file_mode & ~FD_CLOEXEC) |
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(flags & SOCK_CLOEXEC ? FD_CLOEXEC : 0))));
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unassert((file_mode = __sys_fcntl(client, F_GETFL)) != -1);
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unassert(!__sys_fcntl(client, F_SETFL,
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((file_mode & ~O_NONBLOCK) |
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(flags & SOCK_NONBLOCK ? O_NONBLOCK : 0))));
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}
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}
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return client;
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}
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