1  /* Copyright (C) 2003-2023 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 <stdio.h>
      20  #include <unistd.h>
      21  #include <sys/time.h>
      22  #include <time.h>
      23  
      24  
      25  /* Test that nanosleep() does sleep.  */
      26  static int
      27  do_test (void)
      28  {
      29    /* Current time.  */
      30    struct timeval tv1;
      31    (void) gettimeofday (&tv1, NULL);
      32  
      33    struct timespec ts;
      34    ts.tv_sec = 1;
      35    ts.tv_nsec = 0;
      36    TEMP_FAILURE_RETRY (nanosleep (&ts, &ts));
      37  
      38    /* At least one second must have passed.  */
      39    struct timeval tv2;
      40    (void) gettimeofday (&tv2, NULL);
      41  
      42    tv2.tv_sec -= tv1.tv_sec;
      43    tv2.tv_usec -= tv1.tv_usec;
      44    if (tv2.tv_usec < 0)
      45      --tv2.tv_sec;
      46  
      47    if (tv2.tv_sec < 1)
      48      {
      49        puts ("nanosleep didn't sleep long enough");
      50        return 1;
      51      }
      52  
      53    return 0;
      54  }
      55  
      56  #define TEST_FUNCTION do_test ()
      57  #include "../test-skeleton.c"