+ cmsg = CMSG_FIRSTHDR(&msghdr);
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(int) * n_fds);
+
+ memcpy(CMSG_DATA(cmsg), fds, sizeof(int) * n_fds);
+ }
+
+ if (pid != 0 && pid != getpid()) {
+ struct ucred *ucred;
+
+ try_without_ucred = true;
+ controllen_without_ucred = msghdr.msg_controllen;
+
+ msghdr.msg_control = &control;
+ msghdr.msg_controllen += CMSG_LEN(sizeof(struct ucred));
+
+ if (cmsg)
+ cmsg = CMSG_NXTHDR(&msghdr, cmsg);
+ else
+ cmsg = CMSG_FIRSTHDR(&msghdr);
+
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_CREDENTIALS;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred));
+
+ ucred = (struct ucred*) CMSG_DATA(cmsg);
+ ucred->pid = pid;
+ ucred->uid = getuid();
+ ucred->gid = getgid();
+ }
+
+ /* First try with fake ucred data, as requested */
+ if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) >= 0) {
+ r = 1;