1 /* Copyright (C) 2003-2022 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 do_test(void)27do_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" 58