nptl/eintr.c

   1 /* Copyright (C) 2003 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
   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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <pthread.h>
  21 #include <signal.h>
  22 #include <unistd.h>
  23
  24
  25 static int the_sig;
  26
  27
  28 static void
  29 eintr_handler (int sig)
  30 {
  31   if (sig != the_sig)
  32     {
  33       write (STDOUT_FILENO, "eintr_handler: signal number wrong\n", 35);
  34       _exit (1);
  35     }
  36   write (STDOUT_FILENO, ".", 1);
  37 }
  38
  39
  40 static void *
  41 eintr_source (void *arg)
  42 {
  43   struct timespec ts = { .tv_sec = 0, .tv_nsec = 500000 };
  44
  45   if (arg == NULL)
  46     {
  47       sigset_t ss;
  48       sigemptyset (&ss);
  49       sigaddset (&ss, the_sig);
  50       pthread_sigmask (SIG_BLOCK, &ss, NULL);
  51     }
  52
  53   while (1)
  54     {
  55       if (arg != NULL)
  56         pthread_kill (*(pthread_t *) arg, the_sig);
  57       else
  58         kill (getpid (), the_sig);
  59
  60       nanosleep (&ts, NULL);
  61     }
  62
  63   /* NOTREACHED */
  64   return NULL;
  65 }
  66
  67
  68 static void
  69 setup_eintr (int sig, pthread_t *thp)
  70 {
  71   struct sigaction sa;
  72   sigemptyset (&sa.sa_mask);
  73   sa.sa_flags = 0;
  74   sa.sa_handler = eintr_handler;
  75   if (sigaction (sig, &sa, NULL) != 0)
  76     {
  77       puts ("setup_eintr: sigaction failed");
  78       exit (1);
  79     }
  80   the_sig = sig;
  81
  82   /* Create the thread which will fire off the signals.  */
  83   pthread_t th;
  84   if (pthread_create (&th, NULL, eintr_source, thp) != 0)
  85     {
  86       puts ("setup_eintr: pthread_create failed");
  87       exit (1);
  88     }
  89 }