1  /* Time-triggered process termination.
       2     Copyright (C) 2016-2023 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 <support/support.h>
      27  #include <time.h>
      28  #include <unistd.h>
      29  
      30  struct delayed_exit_request
      31  {
      32    void (*exitfunc) (int);
      33    int seconds;
      34  };
      35  
      36  static void *
      37  delayed_exit_thread (void *closure)
      38  {
      39    struct delayed_exit_request *request = closure;
      40    void (*exitfunc) (int) = request->exitfunc;
      41    struct timespec delay = { request->seconds, 0 };
      42    struct timespec remaining = { 0 };
      43    free (request);
      44  
      45    if (nanosleep (&delay, &remaining) != 0)
      46      FAIL_EXIT1 ("nanosleep: %m");
      47    /* Exit the process successfully.  */
      48    exitfunc (0);
      49    return NULL;
      50  }
      51  
      52  static void
      53  delayed_exit_1 (int seconds, void (*exitfunc) (int))
      54  {
      55    /* Create the new thread with all signals blocked.  */
      56    sigset_t all_blocked;
      57    sigfillset (&all_blocked);
      58    sigset_t old_set;
      59    xpthread_sigmask (SIG_SETMASK, &all_blocked, &old_set);
      60    struct delayed_exit_request *request = xmalloc (sizeof (*request));
      61    request->seconds = seconds;
      62    request->exitfunc = exitfunc;
      63    /* Create a detached thread. */
      64    pthread_t thr = xpthread_create (NULL, delayed_exit_thread, request);
      65    xpthread_detach (thr);
      66    /* Restore the original signal mask.  */
      67    xpthread_sigmask (SIG_SETMASK, &old_set, NULL);
      68  }
      69  
      70  void
      71  delayed_exit (int seconds)
      72  {
      73    delayed_exit_1 (seconds, exit);
      74  }
      75  
      76  void
      77  delayed__exit (int seconds)
      78  {
      79    delayed_exit_1 (seconds, _exit);
      80  }