+ return clib_error_return_unix (0, "close (fd %d, %s)", s->fd, s->config);
+ return 0;
+}
+
+static clib_error_t *
+default_socket_sendmsg (clib_socket_t * s, void *msg, int msglen,
+ int fds[], int num_fds)
+{
+ struct msghdr mh = { 0 };
+ struct iovec iov[1];
+ char ctl[CMSG_SPACE (sizeof (int)) * num_fds];
+ int rv;
+
+ iov[0].iov_base = msg;
+ iov[0].iov_len = msglen;
+ mh.msg_iov = iov;
+ mh.msg_iovlen = 1;
+
+ if (num_fds > 0)
+ {
+ struct cmsghdr *cmsg;
+ memset (&ctl, 0, sizeof (ctl));
+ mh.msg_control = ctl;
+ mh.msg_controllen = sizeof (ctl);
+ cmsg = CMSG_FIRSTHDR (&mh);
+ cmsg->cmsg_len = CMSG_LEN (sizeof (int) * num_fds);
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ memcpy (CMSG_DATA (cmsg), fds, sizeof (int) * num_fds);
+ }
+ rv = sendmsg (s->fd, &mh, 0);
+ if (rv < 0)
+ return clib_error_return_unix (0, "sendmsg");
+ return 0;
+}
+
+
+static clib_error_t *
+default_socket_recvmsg (clib_socket_t * s, void *msg, int msglen,
+ int fds[], int num_fds)
+{
+ char ctl[CMSG_SPACE (sizeof (int) * num_fds) +
+ CMSG_SPACE (sizeof (struct ucred))];
+ struct msghdr mh = { 0 };
+ struct iovec iov[1];
+ ssize_t size;
+ struct ucred *cr = 0;
+ struct cmsghdr *cmsg;
+
+ iov[0].iov_base = msg;
+ iov[0].iov_len = msglen;
+ mh.msg_iov = iov;
+ mh.msg_iovlen = 1;
+ mh.msg_control = ctl;
+ mh.msg_controllen = sizeof (ctl);
+
+ memset (ctl, 0, sizeof (ctl));
+
+ /* receive the incoming message */
+ size = recvmsg (s->fd, &mh, 0);
+ if (size != msglen)
+ {
+ return (size == 0) ? clib_error_return (0, "disconnected") :
+ clib_error_return_unix (0, "recvmsg: malformed message (fd %d, '%s')",
+ s->fd, s->config);
+ }
+
+ cmsg = CMSG_FIRSTHDR (&mh);
+ while (cmsg)
+ {
+ if (cmsg->cmsg_level == SOL_SOCKET)
+ {
+ if (cmsg->cmsg_type == SCM_CREDENTIALS)
+ {
+ cr = (struct ucred *) CMSG_DATA (cmsg);
+ s->uid = cr->uid;
+ s->gid = cr->gid;
+ s->pid = cr->pid;
+ }
+ else if (cmsg->cmsg_type == SCM_RIGHTS)
+ {
+ clib_memcpy (fds, CMSG_DATA (cmsg), num_fds * sizeof (int));
+ }
+ }
+ cmsg = CMSG_NXTHDR (&mh, cmsg);
+ }