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109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/**
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* \file socket.c
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* \brief Socket helper routines
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* \author Abramo Bagnara <abramo@alsa-project.org>
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* \date 2003
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*/
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/*
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* Socket helper routines
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* Copyright (c) 2003 by Abramo Bagnara <abramo@alsa-project.org>
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*
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <sys/un.h>
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#include <netinet/in.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <netdb.h>
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#include "local.h"
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#ifndef DOC_HIDDEN
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int snd_send_fd(int sock, void *data, size_t len, int fd)
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{
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int ret;
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size_t cmsg_len = CMSG_LEN(sizeof(int));
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struct cmsghdr *cmsg = alloca(cmsg_len);
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int *fds = (int *) CMSG_DATA(cmsg);
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struct msghdr msghdr;
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struct iovec vec;
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vec.iov_base = (void *)&data;
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vec.iov_len = len;
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cmsg->cmsg_len = cmsg_len;
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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*fds = fd;
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msghdr.msg_name = NULL;
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msghdr.msg_namelen = 0;
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msghdr.msg_iov = &vec;
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msghdr.msg_iovlen = 1;
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msghdr.msg_control = cmsg;
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msghdr.msg_controllen = cmsg_len;
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msghdr.msg_flags = 0;
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ret = sendmsg(sock, &msghdr, 0 );
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if (ret < 0) {
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SYSERR("sendmsg failed");
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return -errno;
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}
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return ret;
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}
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int snd_receive_fd(int sock, void *data, size_t len, int *fd)
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{
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int ret;
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size_t cmsg_len = CMSG_LEN(sizeof(int));
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struct cmsghdr *cmsg = alloca(cmsg_len);
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int *fds = (int *) CMSG_DATA(cmsg);
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struct msghdr msghdr;
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struct iovec vec;
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vec.iov_base = (void *)&data;
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vec.iov_len = len;
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cmsg->cmsg_len = cmsg_len;
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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*fds = -1;
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msghdr.msg_name = NULL;
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msghdr.msg_namelen = 0;
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msghdr.msg_iov = &vec;
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msghdr.msg_iovlen = 1;
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msghdr.msg_control = cmsg;
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msghdr.msg_controllen = cmsg_len;
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msghdr.msg_flags = 0;
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ret = recvmsg(sock, &msghdr, 0);
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if (ret < 0) {
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SYSERR("recvmsg failed");
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return -errno;
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}
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*fd = *fds;
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return ret;
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}
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#endif
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