cosmopolitan/libc/sock/socket.c

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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
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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.
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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.
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*/
#include "libc/dce.h"
#include "libc/sock/internal.h"
#include "libc/sock/sock.h"
#include "libc/sysv/consts/af.h"
#include "libc/sysv/errfuns.h"
/**
* Creates new system resource for network communication.
*
* @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
* @return socket file descriptor or -1 w/ errno
* @error ENETDOWN, EPFNOSUPPORT, etc.
* @see libc/sysv/consts.sh
* @asyncsignalsafe
*/
int socket(int family, int type, int protocol) {
if (family == AF_UNSPEC) {
family = AF_INET;
} 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. */
return epfnosupport();
}
if (!IsWindows()) {
return sys_socket(family, type, protocol);
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} else {
return sys_socket_nt(family, type, protocol);
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}
}