mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
82 lines
4.2 KiB
C
82 lines
4.2 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/assert.h"
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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/intrin/asan.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/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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if (IsAsan() && (!__asan_is_valid(buf, size) ||
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(opt_addr && !__asan_is_valid(opt_addr, addrsize)))) {
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return efault();
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}
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if (!IsWindows()) {
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if (!IsBsd() || !opt_addr) {
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return sys_sendto(fd, buf, size, flags, opt_addr, addrsize);
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} else {
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char addr2[sizeof(
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struct sockaddr_un_bsd)]; /* sockaddr_un_bsd is the largest */
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if (addrsize > sizeof(addr2)) return einval();
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memcpy(&addr2, opt_addr, addrsize);
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sockaddr2bsd(&addr2[0]);
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return sys_sendto(fd, buf, size, flags, &addr2[0], addrsize);
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}
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} else {
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if (__isfdopen(fd)) {
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if (__isfdkind(fd, kFdSocket)) {
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return sys_sendto_nt(&g_fds.p[fd], (struct iovec[]){{buf, size}}, 1,
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flags, opt_addr, addrsize);
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} else if (__isfdkind(fd, kFdFile)) { /* e.g. socketpair() */
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if (flags) return einval();
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if (opt_addr) return eisconn();
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return sys_write_nt(&g_fds.p[fd], (struct iovec[]){{buf, size}}, 1, -1);
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} else {
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return enotsock();
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}
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} else {
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return ebadf();
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}
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}
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}
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