67 lines
3.7 KiB
C
67 lines
3.7 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/internal.h"
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#include "libc/calls/struct/iovec.h"
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#include "libc/dce.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/str/str.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Sends data over network.
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*
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* This function blocks unless MSG_DONTWAIT is passed. In that case, the
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* non-error EWOULDBLOCK might be returned. It basically means we didn't
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* wait around to learn an amount of bytes were written that we know in
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* advance are guaranteed to be atomic.
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*
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* @param fd is the file descriptor returned by socket()
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* @param buf is the data to send, which we'll copy if necessary
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* @param size is the byte-length of buf
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* @param flags MSG_OOB, MSG_DONTROUTE, MSG_PARTIAL, MSG_NOSIGNAL, etc.
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* @param opt_addr is a binary ip:port destination override, which is
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* mandatory for UDP if connect() wasn't called
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* @param addrsize is the byte-length of addr's true polymorphic form
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* @return number of bytes transmitted, or -1 w/ errno
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* @error EINTR, EHOSTUNREACH, ECONNRESET (UDP ICMP Port Unreachable),
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* EPIPE (if MSG_NOSIGNAL), EMSGSIZE, ENOTSOCK, EFAULT, etc.
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* @asyncsignalsafe
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*/
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ssize_t sendto(int fd, const void *buf, size_t size, uint32_t flags,
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const void *opt_addr, uint32_t addrsize) {
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_Static_assert(sizeof(struct sockaddr_in) == sizeof(struct sockaddr_in$bsd));
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if (!IsWindows()) {
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if (!IsBsd() || !opt_addr) {
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return sendto$sysv(fd, buf, size, flags, opt_addr, addrsize);
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} else {
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struct sockaddr_in$bsd addr2;
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if (addrsize != sizeof(addr2)) return einval();
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memcpy(&addr2, opt_addr, sizeof(struct sockaddr_in));
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sockaddr2bsd(&addr2);
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return sendto$sysv(fd, buf, size, flags, &addr2, addrsize);
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}
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} else if (__isfdkind(fd, kFdSocket)) {
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return sendto$nt(&g_fds.p[fd], (struct iovec[]){{buf, size}}, 1, flags,
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opt_addr, addrsize);
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} else {
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return ebadf();
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}
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}
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