support/delayed_exit.c

   1 /* Time-triggered process termination.
   2    Copyright (C) 2016-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <support/xthread.h>
  20 #include <support/xsignal.h>
  21
  22 #include <stdint.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <support/check.h>
  26 #include <time.h>
  27
  28 static void *
  29 delayed_exit_thread (void *seconds_as_ptr)
  30 {
  31   int seconds = (uintptr_t) seconds_as_ptr;
  32   struct timespec delay = { seconds, 0 };
  33   struct timespec remaining = { 0 };
  34   if (nanosleep (&delay, &remaining) != 0)
  35     FAIL_EXIT1 ("nanosleep: %m");
  36   /* Exit the process sucessfully.  */
  37   exit (0);
  38   return NULL;
  39 }
  40
  41 void
  42 delayed_exit (int seconds)
  43 {
  44   /* Create the new thread with all signals blocked.  */
  45   sigset_t all_blocked;
  46   sigfillset (&all_blocked);
  47   sigset_t old_set;
  48   xpthread_sigmask (SIG_SETMASK, &all_blocked, &old_set);
  49   /* Create a detached thread. */
  50   pthread_t thr = xpthread_create
  51     (NULL, delayed_exit_thread, (void *) (uintptr_t) seconds);
  52   xpthread_detach (thr);
  53   /* Restore the original signal mask.  */
  54   xpthread_sigmask (SIG_SETMASK, &old_set, NULL);
  55 }