1 /* Copyright (C) 2002-2022 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 <semaphore.h> 20 #include <stdio.h> 21 #include <unistd.h> 22 23 24 static int do_test(void)25do_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" 88