lib/daemon.c

   1 /*
   2  * daemon.c - "daemonize" a process
   3  */
   4
   5 #include "config.h"
   6
   7 int daemon(int nochdir, int noclose)
   8 {
   9         int nullfd;
  10         pid_t f;
  11
  12         if (!nochdir) {
  13                 if (chdir("/"))
  14                         return -1;
  15         }
  16
  17         if (!noclose) {
  18                 if ((nullfd = open("/dev/null", O_RDWR)) < 0 ||
  19                     dup2(nullfd, 0) < 0 ||
  20                     dup2(nullfd, 1) < 0 ||
  21                     dup2(nullfd, 2) < 0)
  22                         return -1;
  23                 close(nullfd);
  24         }
  25
  26         f = fork();
  27         if (f < 0)
  28                 return -1;
  29         else if (f > 0)
  30                 _exit(0);
  31
  32 #ifdef HAVE_SETSID
  33         return setsid();
  34 #else
  35         return 0;
  36 #endif
  37 }