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 || dup2(nullfd, 2) < 0)
  21             return -1;
  22         close(nullfd);
  23     }
  24
  25     f = fork();
  26     if (f < 0)
  27         return -1;
  28     else if (f > 0)
  29         _exit(0);
  30
  31 #ifdef HAVE_SETSID
  32     return setsid();
  33 #else
  34     return 0;
  35 #endif
  36 }