/**

 * \file socket.c

 * \brief Socket helper routines

 * \author Abramo Bagnara <abramo@alsa-project.org>

 * \date 2003

 */

/*

 *  Socket helper routines

 *  Copyright (c) 2003 by Abramo Bagnara <abramo@alsa-project.org>

 *

 *

 *   This library 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 library; if not, write to the Free Software

 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

 *

 */

#include <stdio.h>

#include <stdlib.h>

#include <stddef.h>

#include <unistd.h>

#include <string.h>

#include <sys/socket.h>

#include <sys/uio.h>

#include <sys/un.h>

#include <netinet/in.h>

#include <sys/ioctl.h>

#include <net/if.h>

#include <netdb.h>

#include "local.h"

#ifndef DOC_HIDDEN

int snd_send_fd(int sock, void *data, size_t len, int fd)

{

	int ret;

	size_t cmsg_len = CMSG_LEN(sizeof(int));

	struct cmsghdr *cmsg = alloca(cmsg_len);

	int *fds = (int *) CMSG_DATA(cmsg);

	struct msghdr msghdr;

	struct iovec vec;

	vec.iov_base = (void *)&dat;;

	vec.iov_len = len;

	cmsg->cmsg_len = cmsg_len;

	cmsg->cmsg_level = SOL_SOCKET;

	cmsg->cmsg_type = SCM_RIGHTS;

	*fds = fd;

	msghdr.msg_name = NULL;

	msghdr.msg_namelen = 0;

	msghdr.msg_iov = &vec;

 	msghdr.msg_iovlen = 1;

	msghdr.msg_control = cmsg;

	msghdr.msg_controllen = cmsg_len;

	msghdr.msg_flags = 0;

	ret = sendmsg(sock, &msghdr, 0 );

	if (ret < 0) {

		SYSERR("sendmsg failed");

		return -errno;

	}

	return ret;

}

int snd_receive_fd(int sock, void *data, size_t len, int *fd)

{

	int ret;

	size_t cmsg_len = CMSG_LEN(sizeof(int));

	struct cmsghdr *cmsg = alloca(cmsg_len);

	int *fds = (int *) CMSG_DATA(cmsg);

	struct msghdr msghdr;

	struct iovec vec;

	vec.iov_base = (void *)&dat;;

	vec.iov_len = len;

	cmsg->cmsg_len = cmsg_len;

	cmsg->cmsg_level = SOL_SOCKET;

	cmsg->cmsg_type = SCM_RIGHTS;

	*fds = -1;

	msghdr.msg_name = NULL;

	msghdr.msg_namelen = 0;

	msghdr.msg_iov = &vec;

	msghdr.msg_iovlen = 1;

	msghdr.msg_control = cmsg;

	msghdr.msg_controllen = cmsg_len;

	msghdr.msg_flags = 0;

	ret = recvmsg(sock, &msghdr, 0);

	if (ret < 0) {

		SYSERR("recvmsg failed");

		return -errno;

	}

	*fd = *fds;

	return ret;

}

#endif