+
+/*
+ * Record pid in /var/run/sm-notify.pid
+ * This file should remain until a reboot, even if the
+ * program exits.
+ * If file already exists, fail.
+ */
+static int record_pid()
+{
+ char pid[20];
+ int fd;
+
+ snprintf(pid, 20, "%d\n", getpid());
+ fd = open("/var/run/sm-notify.pid", O_CREAT|O_EXCL|O_WRONLY, 0600);
+ if (!fd)
+ return 0;
+ write(fd, pid, strlen(pid));
+ close(fd);
+ return 1;
+}