50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/*
|
|
* Copyright (c) 2013, 2014 Jonas 'Sortie' Termansen.
|
|
*
|
|
* Permission to use, copy, modify, and 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.
|
|
*
|
|
* sys/socket/recvfrom.c
|
|
* Receive a message from a socket.
|
|
*/
|
|
|
|
#include <sys/socket.h>
|
|
|
|
#include <string.h>
|
|
|
|
ssize_t recvfrom(int fd,
|
|
void* restrict buffer,
|
|
size_t buffer_size,
|
|
int flags,
|
|
struct sockaddr* restrict addr,
|
|
socklen_t* restrict addrsize)
|
|
{
|
|
struct msghdr msghdr;
|
|
memset(&msghdr, 0, sizeof(msghdr));
|
|
|
|
struct iovec iovec;
|
|
iovec.iov_base = buffer;
|
|
iovec.iov_len = buffer_size;
|
|
|
|
msghdr.msg_name = addr;
|
|
msghdr.msg_namelen = addrsize ? *addrsize : 0;
|
|
msghdr.msg_iov = &iovec;
|
|
msghdr.msg_iovlen = 1;
|
|
|
|
ssize_t result = recvmsg(fd, &msghdr, flags);
|
|
|
|
if ( addrsize )
|
|
*addrsize = msghdr.msg_namelen;
|
|
|
|
return result;
|
|
}
|