sysdeps/pthread/tst-sem6.c

   1 /* Copyright (C) 2003-2021 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <semaphore.h>
  20 #include <signal.h>
  21 #include <stdio.h>
  22 #include <unistd.h>
  23
  24
  25 static void
  26 handler (int sig)
  27 {
  28   struct sigaction sa;
  29
  30   sa.sa_handler = SIG_DFL;
  31   sa.sa_flags = 0;
  32   sigemptyset (&sa.sa_mask);
  33
  34   sigaction (SIGALRM, &sa, NULL);
  35
  36   /* Rearm the timer.  */
  37   alarm (1);
  38 }
  39
  40
  41 static int
  42 do_test (void)
  43 {
  44   sem_t s;
  45   struct sigaction sa;
  46
  47   sa.sa_handler = handler;
  48   sa.sa_flags = 0;
  49   sigemptyset (&sa.sa_mask);
  50
  51   sigaction (SIGALRM, &sa, NULL);
  52
  53   if (sem_init (&s, 0, 0) == -1)
  54     {
  55       puts ("init failed");
  56       return 1;
  57     }
  58
  59   /* Set an alarm for 1 second.  The wrapper will expect this.  */
  60   alarm (1);
  61
  62   int res = sem_wait (&s);
  63   if (res == 0)
  64     {
  65       puts ("wait succeeded");
  66       return 1;
  67     }
  68   if (res != -1 || errno != EINTR)
  69     {
  70       puts ("wait didn't fail with EINTR");
  71       return 1;
  72     }
  73
  74   return 0;
  75 }
  76
  77 #define TEST_FUNCTION do_test ()
  78 #include "../test-skeleton.c"