git.m6w6.name Git - m6w6/btr/blob - bin/btr-setsid.c

   1 #include <unistd.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4
   5 int main(int argc, char *argv[])
   6 {
   7         if (argc < 2) {
   8                 fprintf(stderr, "Usage: %s <program> [args...]\n", argv[0]);
   9                 return EXIT_FAILURE;
  10         }
  11
  12         if (getpid() == getpgrp()) {
  13                 pid_t pid = fork();
  14
  15                 switch (pid) {
  16                 case 0:
  17                         break;
  18                 case -1:
  19                         perror("fork");
  20                         return EXIT_FAILURE;
  21                 default:
  22                         return EXIT_SUCCESS;
  23                 }
  24         }
  25
  26         if (setsid() < 0) {
  27                 perror("setsid");
  28                 return EXIT_FAILURE;
  29         }
  30
  31         execvp(argv[1], &argv[1]);
  32         perror("exec");
  33         return EXIT_FAILURE;
  34 }