1  /* Test of usleep() function.
       2     Copyright (C) 2009-2023 Free Software Foundation, Inc.
       3  
       4     This program is free software: you can redistribute it and/or modify
       5     it under the terms of the GNU General Public License as published by
       6     the Free Software Foundation, either version 3 of the License, or
       7     (at your option) any later version.
       8  
       9     This program 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
      12     GNU General Public License for more details.
      13  
      14     You should have received a copy of the GNU General Public License
      15     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      16  
      17  /* Written by Eric Blake <ebb9@byu.net>, 2009.  */
      18  
      19  #include <config.h>
      20  
      21  #include <unistd.h>
      22  
      23  #include "signature.h"
      24  SIGNATURE_CHECK (usleep, int, (useconds_t));
      25  
      26  #include <time.h>
      27  
      28  #include "macros.h"
      29  
      30  int
      31  main (void)
      32  {
      33    time_t start = time (NULL);
      34    ASSERT (usleep (1000000) == 0);
      35    ASSERT (start < time (NULL));
      36  
      37    ASSERT (usleep (0) == 0);
      38  
      39    return 0;
      40  }