- /* Detach by becoming the new process group leader */
-
- if(setsid() < 0)
- {
- perror("setsid");
- return -1;
- }
-
- /* Change working directory to the root (to avoid keeping mount points busy) */
-
- if(!nochdir)
- {
- chdir("/");
- }
-
- /* Redirect stdin/out/err to /dev/null */
-
- if(!noclose)
- {
- fd = open("/dev/null", O_RDWR);
-
- if(fd < 0)
- {
- perror("opening /dev/null");
- return -1;
- }
- else
- {
- dup2(fd, 0);
- dup2(fd, 1);
- dup2(fd, 2);
- }
- }
+ Unless the argument nochdir is non-zero, daemon() changes the
+ current working directory to the root (``/'').
+
+ Unless the argument noclose is non-zero, daemon() will redirect
+ standard input, standard output and standard error to /dev/null.
+*/
+int daemon(int nochdir, int noclose) {
+#ifdef HAVE_FORK
+ pid_t pid;
+ int fd;
+
+ pid = fork();
+
+ /* Check if forking failed */
+ if(pid < 0) {
+ perror("fork");
+ exit(-1);
+ }
+
+ /* If we are the parent, terminate */
+ if(pid)
+ exit(0);
+
+ /* Detach by becoming the new process group leader */
+ if(setsid() < 0) {
+ perror("setsid");
+ return -1;
+ }
+
+ /* Change working directory to the root (to avoid keeping mount
+ points busy) */
+ if(!nochdir) {
+ chdir("/");
+ }
+
+ /* Redirect stdin/out/err to /dev/null */
+ if(!noclose) {
+ fd = open("/dev/null", O_RDWR);
+
+ if(fd < 0) {
+ perror("opening /dev/null");
+ return -1;
+ } else {
+ dup2(fd, 0);
+ dup2(fd, 1);
+ dup2(fd, 2);
+ }
+ }
+
+ return 0;
+#else
+ return -1;
+#endif