+static void create_pid_file(void)
+{
+ char *pid_file = lp_pid_file();
+ char pidbuf[16];
+ pid_t pid = getpid();
+ int fd;
+
+ if (!pid_file || !*pid_file)
+ return;
+
+ cleanup_set_pid(pid);
+ if ((fd = do_open(pid_file, O_WRONLY|O_CREAT|O_EXCL, 0666 & ~orig_umask)) == -1) {
+ cleanup_set_pid(0);
+ fprintf(stderr, "failed to create pid file %s: %s\n", pid_file, strerror(errno));
+ rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
+ exit_cleanup(RERR_FILEIO);
+ }
+ snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
+ write(fd, pidbuf, strlen(pidbuf));
+ close(fd);
+}
+
+/* Become a daemon, discarding the controlling terminal. */
+static void become_daemon(void)
+{
+ int i;
+ pid_t pid = fork();
+
+ if (pid) {
+ if (pid < 0) {
+ fprintf(stderr, "failed to fork: %s\n", strerror(errno));
+ exit_cleanup(RERR_FILEIO);
+ }
+ _exit(0);
+ }
+
+ create_pid_file();
+
+ /* detach from the terminal */
+#ifdef HAVE_SETSID
+ setsid();
+#elif defined TIOCNOTTY
+ i = open("/dev/tty", O_RDWR);
+ if (i >= 0) {
+ ioctl(i, (int)TIOCNOTTY, (char *)0);
+ close(i);
+ }
+#endif
+ /* make sure that stdin, stdout an stderr don't stuff things
+ * up (library functions, for example) */
+ for (i = 0; i < 3; i++) {
+ close(i);
+ open("/dev/null", O_RDWR);
+ }
+}
+