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Add socketpair (#122)

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fabriziobertocci 2021-03-17 01:05:59 -04:00 • committed by GitHub
parent 6388ef21f8
commit ca88ce5026
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7 changed files with 238 additions and 4 deletions
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libc/sock/socketpair.c Normal file
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/*-*- 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/dce.h"
#include "libc/sock/internal.h"
#include "libc/sock/sock.h"
#include "libc/sysv/consts/af.h"
#include "libc/sysv/consts/sock.h"
#include "libc/sysv/errfuns.h"
/**
* Creates a pair of connected sockets
*
* @param family can be AF_UNIX, AF_INET, etc.
* @param type can be SOCK_STREAM (for TCP), SOCK_DGRAM (e.g. UDP), or
* SOCK_RAW (IP) so long as IP_HDRINCL was passed to setsockopt();
* and additionally, may be or'd with SOCK_NONBLOCK, SOCK_CLOEXEC
* @param protocol can be IPPROTO_TCP, IPPROTO_UDP, or IPPROTO_ICMP
* @param sv a vector of 2 integers to store the created sockets.
* @return 0 if success, -1 in case of error
* @error EFAULT, EPFNOSUPPORT, etc.
* @see libc/sysv/consts.sh
* @asyncsignalsafe
*/
int socketpair(int family, int type, int protocol, int sv[2]) {
if (family == AF_UNSPEC) {
family = AF_UNIX;
} else if (family == AF_INET6) {
/* Recommend IPv6 on frontend serving infrastructure only. That's
what Google Cloud does. It's more secure. It also means poll()
will work on Windows, which doesn't allow mixing third layers. */
errno = EAFNOSUPPORT;
return epfnosupport();
}
if (!IsWindows()) {
return sys_socketpair(family, type, protocol, sv);
}
return sys_socketpair_nt(family, type, protocol, sv);
}