+static int init_notify(const char *state)
+{
+ int fd = -1, r;
+ struct msghdr msghdr;
+ struct iovec iovec;
+ union {
+ struct sockaddr sa;
+ struct sockaddr_un un;
+ } sockaddr;
+ const char *e;
+
+ if (!(e = getenv("NOTIFY_SOCKET"))) {
+ r = 0;
+ goto finish;
+ }
+
+ /* Must be an abstract socket, or an absolute path */
+ if ((e[0] != '@' && e[0] != '/') || e[1] == 0) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ memset(&sockaddr, 0, sizeof(sockaddr));
+ sockaddr.sa.sa_family = AF_UNIX;
+ strncpy(sockaddr.un.sun_path, e, sizeof(sockaddr.un.sun_path));
+
+ if (sockaddr.un.sun_path[0] == '@')
+ sockaddr.un.sun_path[0] = 0;
+
+ memset(&iovec, 0, sizeof(iovec));
+ iovec.iov_base = (char*) state;
+ iovec.iov_len = strlen(state);
+
+ memset(&msghdr, 0, sizeof(msghdr));
+ msghdr.msg_name = &sockaddr;
+ msghdr.msg_namelen = sizeof(sa_family_t) + strlen(e);
+ if (msghdr.msg_namelen > sizeof(struct sockaddr_un))
+ msghdr.msg_namelen = sizeof(struct sockaddr_un);
+ msghdr.msg_iov = &iovec;
+ msghdr.msg_iovlen = 1;
+
+ if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ r = 0;
+
+finish:
+ if (fd >= 0)
+ close(fd);
+
+ return r;
+}
+