-#ifndef HAVE_DAEMON
-/*
- Replacement for the daemon() function.
-
- The daemon() function is for programs wishing to detach themselves
- from the controlling terminal and run in the background as system
- daemons.
-
- 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
-}
-#endif
-
-#ifndef HAVE_GET_CURRENT_DIR_NAME
-/*
- Replacement for the GNU get_current_dir_name function:
-
- get_current_dir_name will malloc(3) an array big enough to hold the
- current directory name. If the environment variable PWD is set, and
- its value is correct, then that value will be returned.
-*/
-char *get_current_dir_name(void) {
- size_t size;
- char *buf;
- char *r;
-
- /* Start with 100 bytes. If this turns out to be insufficient to
- contain the working directory, double the size. */
- size = 100;
- buf = xmalloc(size);
-
- errno = 0; /* Success */
- r = getcwd(buf, size);
-
- /* getcwd returns NULL and sets errno to ERANGE if the bufferspace
- is insufficient to contain the entire working directory. */
- while(r == NULL && errno == ERANGE) {
- free(buf);
- size <<= 1; /* double the size */
- buf = xmalloc(size);
- r = getcwd(buf, size);
- }
-
- return buf;
-}
-#endif
-