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Add sendmsg and recvmsg (#148)

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fabriziobertocci 2021-04-08 01:53:23 -04:00 • committed by GitHub
parent da8a08fd58
commit 24d79599cc
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5 changed files with 184 additions and 2 deletions
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libc/sock/sendmsg.c Normal file
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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 │
│ │
│ 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. │
│ │
│ 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. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/calls/internal.h"
#include "libc/calls/struct/iovec.h"
#include "libc/dce.h"
#include "libc/sock/internal.h"
#include "libc/sock/sock.h"
#include "libc/str/str.h"
#include "libc/sysv/errfuns.h"
/**
* Sends a message on a socket.
*
* @param fd is the file descriptor returned by socket()
* @param msg is a pointer to a struct msghdr containing all the required
* parameters (the destination address, buffers, ...)
* @param flags MSG_OOB, MSG_DONTROUTE, MSG_PARTIAL, MSG_NOSIGNAL, etc.
* @return number of bytes transmitted, or -1 w/ errno
* @error EINTR, EHOSTUNREACH, ECONNRESET (UDP ICMP Port Unreachable),
* EPIPE (if MSG_NOSIGNAL), EMSGSIZE, ENOTSOCK, EFAULT, etc.
* @asyncsignalsafe
*/
ssize_t sendmsg(int fd, const struct msghdr *msg, int flags) {
if (!IsWindows()) {
if (IsBsd() && msg->msg_name) {
/* An optional address is provided, convert it to the BSD form */
char addr2[128];
struct msghdr msg2;
if (msg->msg_namelen > sizeof(addr2)) return einval();
memcpy(&addr2[0], msg->msg_name, msg->msg_namelen);
sockaddr2bsd(&addr2[0]);
/* Copy all of msg (except for msg_name) into the new ephemeral local */
memcpy(&msg2, msg, sizeof(msg2));
msg2.msg_name = &addr2[0];
return sys_sendmsg(fd, &msg2, flags);
}
/* else do the syscall */
return sys_sendmsg(fd, msg, flags);
} else if (__isfdkind(fd, kFdSocket)) {
if (msg->msg_control != NULL) return einval(); /* Control msg not supported */
return sys_sendto_nt(&g_fds.p[fd], msg->msg_iov, msg->msg_iovlen, flags,
msg->msg_name, msg->msg_namelen);
} else {
return ebadf();
}
}