1 /* Copyright (C) 2011 Free Software Foundation, Inc.
3 This program is free software: you can redistribute it and/or modify
4 it under the terms of the GNU General Public License as published by
5 the Free Software Foundation; either version 3 of the License, or
6 (at your option) any later version.
8 This program is distributed in the hope that it will be useful,
9 but WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 GNU General Public License for more details.
13 You should have received a copy of the GNU General Public License
14 along with this program. If not, see <http://www.gnu.org/licenses/>. */
26 #include <sys/types.h>
29 #include <sys/socket.h>
36 #ifndef MSG_CMSG_CLOEXEC
37 # define MSG_CMSG_CLOEXEC 0
41 /* sendfd sends the file descriptor fd along the socket
42 to a process calling recvfd on the other end.
44 Return 0 on success, or -1 with errno set in case of error.
47 sendfd (int sock, int fd)
52 # if HAVE_UNIXSOCKET_SCM_RIGHTS_BSD44_WAY
54 char buf[CMSG_SPACE (sizeof fd)];
57 /* send at least one char */
58 memset (&msg, 0, sizeof msg);
66 # if HAVE_UNIXSOCKET_SCM_RIGHTS_BSD44_WAY
67 msg.msg_control = buf;
68 msg.msg_controllen = sizeof buf;
69 cmsg = CMSG_FIRSTHDR (&msg);
70 cmsg->cmsg_level = SOL_SOCKET;
71 cmsg->cmsg_type = SCM_RIGHTS;
72 cmsg->cmsg_len = CMSG_LEN (sizeof fd);
73 /* Initialize the payload: */
74 memcpy (CMSG_DATA (cmsg), &fd, sizeof fd);
75 # elif HAVE_UNIXSOCKET_SCM_RIGHTS_BSD43_WAY
76 msg.msg_accrights = &fd;
77 msg.msg_accrightslen = sizeof fd;
83 if (sendmsg (sock, &msg, 0) != iov.iov_len)
89 sendfd (int sock _GL_UNUSED, int fd _GL_UNUSED)
98 /* recvfd receives a file descriptor through the socket.
99 The flags are a bitmask, possibly including O_CLOEXEC (defined in <fcntl.h>).
101 Return 0 on success, or -1 with errno set in case of error.
104 recvfd (int sock, int flags)
110 # if HAVE_UNIXSOCKET_SCM_RIGHTS_BSD44_WAY
111 struct cmsghdr *cmsg;
112 char buf[CMSG_SPACE (sizeof fd)];
113 int flags_recvmsg = flags & O_CLOEXEC ? MSG_CMSG_CLOEXEC : 0;
116 if ((flags & ~O_CLOEXEC) != 0)
122 /* send at least one char */
123 memset (&msg, 0, sizeof msg);
124 iov.iov_base = &recv;
131 # if HAVE_UNIXSOCKET_SCM_RIGHTS_BSD44_WAY
132 msg.msg_control = buf;
133 msg.msg_controllen = sizeof buf;
134 cmsg = CMSG_FIRSTHDR (&msg);
135 cmsg->cmsg_level = SOL_SOCKET;
136 cmsg->cmsg_type = SCM_RIGHTS;
137 cmsg->cmsg_len = CMSG_LEN (sizeof fd);
138 /* Initialize the payload: */
139 memcpy (CMSG_DATA (cmsg), &fd, sizeof fd);
140 msg.msg_controllen = cmsg->cmsg_len;
142 if (recvmsg (sock, &msg, flags_recvmsg) < 0)
145 cmsg = CMSG_FIRSTHDR (&msg);
147 if (cmsg == NULL || cmsg->cmsg_len != CMSG_LEN (sizeof fd)
148 || cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS)
150 /* fake errno: at end the file is not available */
155 memcpy (&fd, CMSG_DATA (cmsg), sizeof fd);
157 /* set close-on-exec flag */
158 if (!MSG_CMSG_CLOEXEC && (flags & O_CLOEXEC))
160 if (set_cloexec_flag (fd, true) < 0)
162 int saved_errno = errno;
169 # elif HAVE_UNIXSOCKET_SCM_RIGHTS_BSD43_WAY
170 msg.msg_accrights = &fd;
171 msg.msg_accrightslen = sizeof fd;
172 if (recvmsg (sock, &msg, 0) < 0)
175 /* set close-on-exec flag */
176 if (flags & O_CLOEXEC)
178 if (set_cloexec_flag (fd, true) < 0)
180 int saved_errno = errno;
194 recvfd (int sock _GL_UNUSED, int flags _GL_UNUSED)