3245 in.ndp daemon should not be session leader
Reviewed by: Sebastien Roy <sebastien.roy@delphix.com>
Reviewed by: Garrett D'Amore <garrett@damore.org>

*** 906,917 ****
  }
  
  static void
  daemonize_ndpd(void)
  {
-         FILE *pidfp;
-         mode_t pidmode = (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); /* 0644 */
          struct itimerval it;
          boolean_t timerval = _B_TRUE;
  
          /*
           * Need to get current timer settings so they can be restored
--- 906,915 ----
*** 924,965 ****
                              "daemonize_ndpd: failed to get itimerval\n");
                  timerval = _B_FALSE;
          }
  
          /* Daemonize. */
!         switch (fork()) {
!         case 0:
!                 /* Child */
!                 break;
!         case -1:
                  logperror("fork");
                  exit(1);
-         default:
-                 /* Parent */
-                 _exit(0);
          }
  
-         /* Store our process id, blow away any existing file if it exists. */
-         if ((pidfp = fopen(PATH_PID, "w")) == NULL) {
-                 (void) fprintf(stderr, "%s: unable to open " PATH_PID ": %s\n",
-                     argv0[0], strerror(errno));
-         } else {
-                 (void) fprintf(pidfp, "%ld\n", getpid());
-                 (void) fclose(pidfp);
-                 (void) chmod(PATH_PID, pidmode);
-         }
- 
-         (void) close(0);
-         (void) close(1);
-         (void) close(2);
- 
-         (void) chdir("/");
-         (void) open("/dev/null", O_RDWR);
-         (void) dup2(0, 1);
-         (void) dup2(0, 2);
-         (void) setsid();
- 
          already_daemonized = _B_TRUE;
  
          /*
           * Restore timer values, if we were able to save them; if not,
           * check and set the right value by calling run_timeouts().
--- 922,936 ----
                              "daemonize_ndpd: failed to get itimerval\n");
                  timerval = _B_FALSE;
          }
  
          /* Daemonize. */
!         if (daemon(0, 0) == -1) {
                  logperror("fork");
                  exit(1);
          }
  
          already_daemonized = _B_TRUE;
  
          /*
           * Restore timer values, if we were able to save them; if not,
           * check and set the right value by calling run_timeouts().
*** 1413,1423 ****
                   */
                  closefrom(3);
  
                  logmsg(LOG_ERR, "SIGHUP: restart and reread config file\n");
                  (void) execv(argv0[0], argv0);
-                 (void) unlink(PATH_PID);
                  _exit(0177);
                  /* NOTREACHED */
          case SIGUSR1:
                  logmsg(LOG_DEBUG, "Printing configuration:\n");
                  phyint_print_all();
--- 1384,1393 ----
*** 1431,1441 ****
                                  check_to_advertise(pi, START_FINAL_ADV);
  
                          phyint_delete(pi);
                  }
                  (void) unlink(NDPD_SNMP_SOCKET);
-                 (void) unlink(PATH_PID);
                  exit(0);
                  /* NOTREACHED */
          case 255:
                  /*
                   * Special "signal" from loopback_ra_enqueue.
--- 1401,1410 ----