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/*****************************************************************************
* sendmsg.c: POSIX sendmsg() replacement
*****************************************************************************
* Copyright © 2017 VLC authors and VideoLAN
* Copyright © 2016 Rémi Denis-Courmont
*
* Authors: Rémi Denis-Courmont
* Dennis Hamester <dhamester@jusst.de>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#ifdef _WIN32
# include <errno.h>
# include <stdlib.h>
# include <winsock2.h>
ssize_t sendmsg(int fd, const struct msghdr *msg, int flags)
{
if (msg->msg_controllen != 0)
{
errno = ENOSYS;
return -1;
}
if (msg->msg_iovlen > IOV_MAX)
{
errno = EINVAL;
return -1;
}
WSABUF *buf = malloc(msg->msg_iovlen * sizeof (*buf));
if (buf == NULL)
return -1;
for (unsigned i = 0; i < msg->msg_iovlen; i++)
{
buf[i].len = msg->msg_iov[i].iov_len;
buf[i].buf = (void *)msg->msg_iov[i].iov_base;
}
DWORD sent;
int ret = WSASendTo(fd, buf, msg->msg_iovlen, &sent, flags,
msg->msg_name, msg->msg_namelen, NULL, NULL);
free(buf);
if (ret == 0)
return sent;
int err = WSAGetLastError();
switch (err)
{
case WSAEWOULDBLOCK:
errno = EAGAIN;
break;
case WSA_NOT_ENOUGH_MEMORY:
errno = ENOMEM;
break;
case WSAEAFNOSUPPORT:
errno = EAFNOSUPPORT;
break;
case WSAENOBUFS:
errno = ENOBUFS;
break;
case WSAEINPROGRESS:
errno = EINPROGRESS;
break;
case WSAEINTR:
errno = EINTR;
break;
case WSAEBADF:
errno = EBADF;
break;
case WSAEACCES:
errno = EACCES;
break;
case WSAEFAULT:
errno = EFAULT;
break;
case WSAEINVAL:
errno = EINVAL;
break;
case WSAEMFILE:
errno = EMFILE;
break;
case WSAEALREADY:
errno = EALREADY;
break;
case WSAECONNRESET:
errno = ECONNRESET;
break;
default:
errno = err;
break;
}
return -1;
}
#elif defined __native_client__
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/uio.h>
ssize_t sendmsg(int fd, const struct msghdr *msg, int flags)
{
if (msg->msg_controllen != 0)
{
errno = ENOSYS;
return -1;
}
if ((msg->msg_iovlen <= 0) || (msg->msg_iovlen > IOV_MAX))
{
errno = EMSGSIZE;
return -1;
}
size_t full_size = 0;
for (int i = 0; i < msg->msg_iovlen; ++i)
full_size += msg->msg_iov[i].iov_len;
if (full_size > SSIZE_MAX) {
errno = EINVAL;
return -1;
}
/**
* We always allocate here, because whether send/sento allow NULL message or
* not is unspecified.
*/
char *data = malloc(full_size ? full_size : 1);
if (!data) {
errno = ENOMEM;
return -1;
}
size_t tmp = 0;
for (int i = 0; i < msg->msg_iovlen; ++i) {
memcpy(data + tmp, msg->msg_iov[i].iov_base, msg->msg_iov[i].iov_len);
tmp += msg->msg_iov[i].iov_len;
}
ssize_t res;
if (msg->msg_name)
res = sendto(fd, data, full_size, flags, msg->msg_name, msg->msg_namelen);
else
res = send(fd, data, full_size, flags);
free(data);
return res;
}
#else
#error sendmsg not implemented on your platform!
#endif
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