mirror of
https://github.com/jart/cosmopolitan.git
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f40f97bd07
The send{,to,msg} and recv{,from,msg} functions have been updated to
delegate to WriteFile and ReadFile when appropriate, due to the fact
that socketpair(AF_UNIX) is implemented using kFdFile.
Thanks @fabriziobertocci for writing the test that caught this.
See #148 and #122
72 lines
3.7 KiB
C
72 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/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/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 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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*/
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ssize_t sendmsg(int fd, const struct msghdr *msg, int flags) {
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if (!IsWindows()) {
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if (IsBsd() && msg->msg_name) {
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/* An optional address is provided, convert it to the BSD form */
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char addr2[128];
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struct msghdr msg2;
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if (msg->msg_namelen > sizeof(addr2)) return einval();
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memcpy(&addr2[0], msg->msg_name, msg->msg_namelen);
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sockaddr2bsd(&addr2[0]);
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/* Copy all of msg (except for msg_name) into the new ephemeral local */
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memcpy(&msg2, msg, sizeof(msg2));
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msg2.msg_name = &addr2[0];
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return sys_sendmsg(fd, &msg2, flags);
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}
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/* else do the syscall */
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return sys_sendmsg(fd, msg, flags);
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} else {
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if (__isfdopen(fd)) {
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if (msg->msg_control) return einval(); /* control msg not supported */
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if (__isfdkind(fd, kFdSocket)) {
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return sys_sendto_nt(&g_fds.p[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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return sys_write_nt(&g_fds.p[fd], msg->msg_iov, msg->msg_iovlen, -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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