#define FOR_setsid
#include "toys.h"

void setsid_main(void)
{
  int i;

  // setsid() fails if we're already session leader, ala "exec setsid" from sh.
  // Second call can't fail, so loop won't continue endlessly.
  while (setsid()<0) {
    pid_t pid;

    // This must be before vfork() or tcsetpgrp() will hang waiting for parent.
    setpgid(0, 0);

    pid = XVFORK();
    if (pid) {
      i = 0;
      if (FLAG(w)) {
        i = 127;
        if (pid>0) i = xwaitpid(pid);
      }
      _exit(i);
    }
  }

  if (FLAG(c)) tcsetpgrp(0, getpid());
  if (FLAG(d) && (i = open("/dev/tty", O_RDONLY)) != -1) {
    ioctl(i, TIOCNOTTY);
    close(i);
  }
  xexec(toys.optargs);
}