1 /**
2 * \file socket.c
3 * \brief Socket helper routines
4 * \author Abramo Bagnara <abramo@alsa-project.org>
5 * \date 2003
6 */
7 /*
8 * Socket helper routines
9 * Copyright (c) 2003 by Abramo Bagnara <abramo@alsa-project.org>
10 *
11 *
12 * This library is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Lesser General Public License as
14 * published by the Free Software Foundation; either version 2.1 of
15 * the License, or (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Lesser General Public License for more details.
21 *
22 * You should have received a copy of the GNU Lesser General Public
23 * License along with this library; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 *
26 */
27
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <stddef.h>
31 #include <unistd.h>
32 #include <string.h>
33 #include <sys/socket.h>
34 #include <sys/uio.h>
35 #include <sys/un.h>
36 #include <netinet/in.h>
37 #include <sys/ioctl.h>
38 #include <net/if.h>
39 #include <netdb.h>
40 #include "local.h"
41
42 #ifndef DOC_HIDDEN
snd_send_fd(int sock,void * data,size_t len,int fd)43 int snd_send_fd(int sock, void *data, size_t len, int fd)
44 {
45 int ret;
46 size_t cmsg_len = CMSG_LEN(sizeof(int));
47 struct cmsghdr *cmsg = alloca(cmsg_len);
48 int *fds = (int *) CMSG_DATA(cmsg);
49 struct msghdr msghdr;
50 struct iovec vec;
51
52 vec.iov_base = (void *)&data;
53 vec.iov_len = len;
54
55 cmsg->cmsg_len = cmsg_len;
56 cmsg->cmsg_level = SOL_SOCKET;
57 cmsg->cmsg_type = SCM_RIGHTS;
58 *fds = fd;
59
60 msghdr.msg_name = NULL;
61 msghdr.msg_namelen = 0;
62 msghdr.msg_iov = &vec;
63 msghdr.msg_iovlen = 1;
64 msghdr.msg_control = cmsg;
65 msghdr.msg_controllen = cmsg_len;
66 msghdr.msg_flags = 0;
67
68 ret = sendmsg(sock, &msghdr, 0 );
69 if (ret < 0) {
70 SYSERR("sendmsg failed");
71 return -errno;
72 }
73 return ret;
74 }
75
snd_receive_fd(int sock,void * data,size_t len,int * fd)76 int snd_receive_fd(int sock, void *data, size_t len, int *fd)
77 {
78 int ret;
79 size_t cmsg_len = CMSG_LEN(sizeof(int));
80 struct cmsghdr *cmsg = alloca(cmsg_len);
81 int *fds = (int *) CMSG_DATA(cmsg);
82 struct msghdr msghdr;
83 struct iovec vec;
84
85 vec.iov_base = (void *)&data;
86 vec.iov_len = len;
87
88 cmsg->cmsg_len = cmsg_len;
89 cmsg->cmsg_level = SOL_SOCKET;
90 cmsg->cmsg_type = SCM_RIGHTS;
91 *fds = -1;
92
93 msghdr.msg_name = NULL;
94 msghdr.msg_namelen = 0;
95 msghdr.msg_iov = &vec;
96 msghdr.msg_iovlen = 1;
97 msghdr.msg_control = cmsg;
98 msghdr.msg_controllen = cmsg_len;
99 msghdr.msg_flags = 0;
100
101 ret = recvmsg(sock, &msghdr, 0);
102 if (ret < 0) {
103 SYSERR("recvmsg failed");
104 return -errno;
105 }
106 *fd = *fds;
107 return ret;
108 }
109 #endif
110