pd.if.org Git - startuptools/blob - daemon.c

   1 /*
   2  * daemonize and exec
   3  */
   4
   5 #include <stdlib.h>
   6 #include <stdio.h>
   7
   8 #include <sys/types.h>
   9 #include <sys/stat.h>
  10 #include <fcntl.h>
  11
  12 #include <unistd.h>
  13
  14 #include "exec.c"
  15
  16 int main(int ac, char *av[]) {
  17         pid_t pid, sid;
  18
  19         pid = fork();
  20         if (pid < 0) {
  21                 fprintf(stderr, "fork fail!\n");
  22                 exit(EXIT_FAILURE);
  23         }
  24
  25         if (pid > 0) {
  26                 exit(EXIT_SUCCESS);
  27         }
  28
  29         umask(0);
  30
  31         sid = setsid();
  32         if (sid < 0) {
  33                 exit(EXIT_SUCCESS);
  34         }
  35
  36         pid = fork();
  37         if (pid < 0) {
  38                 fprintf(stderr, "fork fail!\n");
  39                 exit(EXIT_FAILURE);
  40         }
  41         if (pid > 0) {
  42                 /* fprintf(stderr, "pid = %d\n", pid); */
  43                 exit(EXIT_SUCCESS);
  44         }
  45
  46         /* reset the file descriptors */
  47         if (isatty(0)) {
  48                 close(0);
  49                 open("/dev/null", O_RDONLY);
  50         }
  51         if (isatty(1)) {
  52                 close(0);
  53                 open("/dev/null", O_WRONLY);
  54         }
  55         if (isatty(2)) {
  56                 close(0);
  57                 open("/dev/null", O_WRONLY);
  58         }
  59
  60         if (chdir("/") < 0) {
  61                 exit(EXIT_FAILURE);
  62         }
  63
  64         do_exec(1, ac, av);
  65
  66         /* shouldn't get here... */
  67         return EXIT_FAILURE;
  68 }