mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
103 lines
4.6 KiB
C
103 lines
4.6 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/strace.internal.h"
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#include "libc/calls/struct/iovec.h"
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#include "libc/calls/struct/iovec.internal.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/intrin/describeflags.internal.h"
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#include "libc/intrin/kprintf.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/msghdr.h"
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#include "libc/sock/struct/msghdr.internal.h"
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#include "libc/sock/struct/sockaddr.internal.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 a message on a socket.
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*
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* @param fd is the file descriptor returned by socket()
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* @param msg is a pointer to a struct msghdr containing all the required
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* parameters (the destination address, buffers, ...)
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* @param flags MSG_OOB, MSG_DONTROUTE, MSG_PARTIAL, MSG_NOSIGNAL, etc.
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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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* @restartable (unless SO_RCVTIMEO)
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*/
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ssize_t sendmsg(int fd, const struct msghdr *msg, int flags) {
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int64_t rc;
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struct msghdr msg2;
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union sockaddr_storage_bsd bsd;
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if (IsAsan() && !__asan_is_valid_msghdr(msg)) {
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rc = efault();
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} else if (!IsWindows()) {
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if (IsBsd() && msg->msg_name) {
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memcpy(&msg2, msg, sizeof(msg2));
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if (!(rc = sockaddr2bsd(msg->msg_name, msg->msg_namelen, &bsd,
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&msg2.msg_namelen))) {
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msg2.msg_name = &bsd.sa;
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rc = sys_sendmsg(fd, &msg2, flags);
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}
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} else {
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rc = sys_sendmsg(fd, msg, flags);
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}
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} else if (__isfdopen(fd)) {
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if (msg->msg_control) {
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rc = einval(); /* control msg not supported */
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} else if (__isfdkind(fd, kFdSocket)) {
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rc = sys_sendto_nt(fd, msg->msg_iov, msg->msg_iovlen, flags,
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msg->msg_name, msg->msg_namelen);
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} else if (__isfdkind(fd, kFdFile)) {
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rc = sys_write_nt(fd, msg->msg_iov, msg->msg_iovlen, -1);
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} else {
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rc = enotsock();
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}
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} else {
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rc = ebadf();
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}
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#if defined(SYSDEBUG) && _DATATRACE
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if (__strace > 0) {
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kprintf(STRACE_PROLOGUE "sendmsg(");
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if ((!IsAsan() && kisdangerous(msg)) ||
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(IsAsan() && !__asan_is_valid(msg, sizeof(*msg)))) {
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kprintf("%p", msg);
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} else {
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kprintf("{");
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kprintf(".name=%#.*hhs, ", msg->msg_namelen, msg->msg_name);
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if (msg->msg_controllen)
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kprintf(", .control=%#.*hhs, ", msg->msg_controllen, msg->msg_control);
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if (msg->msg_flags) kprintf(".flags=%#x, ", msg->msg_flags);
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kprintf(", .iov=", fd);
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DescribeIov(msg->msg_iov, msg->msg_iovlen, rc != -1 ? rc : 0);
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kprintf("}");
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}
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kprintf(", %#x) → %'ld% m\n", flags, rc);
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}
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#endif
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return rc;
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}
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