1  /* Copyright (C) 2002-2023 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 <stdio.h>
      21  #include <unistd.h>
      22  
      23  
      24  static int
      25  do_test (void)
      26  {
      27    sem_t s;
      28  
      29    if (sem_init (&s, 0, 1) == -1)
      30      {
      31        puts ("init failed");
      32        return 1;
      33      }
      34  
      35    if (TEMP_FAILURE_RETRY (sem_wait (&s)) == -1)
      36      {
      37        puts ("1st wait failed");
      38        return 1;
      39      }
      40  
      41    if (sem_post (&s) == -1)
      42      {
      43        puts ("1st post failed");
      44        return 1;
      45      }
      46  
      47    if (TEMP_FAILURE_RETRY (sem_trywait (&s)) == -1)
      48      {
      49        puts ("1st trywait failed");
      50        return 1;
      51      }
      52  
      53    errno = 0;
      54    if (TEMP_FAILURE_RETRY (sem_trywait (&s)) != -1)
      55      {
      56        puts ("2nd trywait succeeded");
      57        return 1;
      58      }
      59    else if (errno != EAGAIN)
      60      {
      61        puts ("2nd trywait did not set errno to EAGAIN");
      62        return 1;
      63      }
      64  
      65    if (sem_post (&s) == -1)
      66      {
      67        puts ("2nd post failed");
      68        return 1;
      69      }
      70  
      71    if (TEMP_FAILURE_RETRY (sem_wait (&s)) == -1)
      72      {
      73        puts ("2nd wait failed");
      74        return 1;
      75      }
      76  
      77    if (sem_destroy (&s) == -1)
      78      {
      79        puts ("destroy failed");
      80        return 1;
      81      }
      82  
      83    return 0;
      84  }
      85  
      86  #define TEST_FUNCTION do_test ()
      87  #include "../test-skeleton.c"