1 /* Test of sleep() function. 2 Copyright (C) 2007-2020 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 Bruno Haible <bruno@clisp.org>, 2007. */ 18 19 #include <config.h> 20 21 #include <unistd.h> 22 23 #include "signature.h" 24 SIGNATURE_CHECK (sleep, unsigned int, (unsigned int)); 25 26 #include <signal.h> 27 28 #include "macros.h" 29 30 #if HAVE_DECL_ALARM 31 static void handle_alarm(int sig)32handle_alarm (int sig) 33 { 34 if (sig != SIGALRM) 35 _exit (1); 36 } 37 #endif 38 39 int main(void)40main (void) 41 { 42 ASSERT (sleep (1) <= 1); 43 44 ASSERT (sleep (0) == 0); 45 46 #if HAVE_DECL_ALARM 47 { 48 const unsigned int pentecost = 50 * 24 * 60 * 60; /* 50 days. */ 49 unsigned int remaining; 50 signal (SIGALRM, handle_alarm); 51 alarm (1); 52 remaining = sleep (pentecost); 53 ASSERT (pentecost - 10 < remaining && remaining <= pentecost); 54 } 55 #endif 56 57 return 0; 58 } 59