t_sem.c revision 1.2
1 /* $NetBSD: t_sem.c,v 1.2 2010/11/08 13:05:49 njoly Exp $ */ 2 3 /* 4 * Copyright (c) 2008, 2010 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * Copyright (C) 2000 Jason Evans <jasone (at) freebsd.org>. 31 * All rights reserved. 32 * 33 * Redistribution and use in source and binary forms, with or without 34 * modification, are permitted provided that the following conditions 35 * are met: 36 * 1. Redistributions of source code must retain the above copyright 37 * notice(s), this list of conditions and the following disclaimer as 38 * the first lines of this file unmodified other than the possible 39 * addition of one or more copyright notices. 40 * 2. Redistributions in binary form must reproduce the above copyright 41 * notice(s), this list of conditions and the following disclaimer in 42 * the documentation and/or other materials provided with the 43 * distribution. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY 46 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 48 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE 49 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 50 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 51 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 52 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 53 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 54 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 55 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 56 */ 57 58 #include <sys/cdefs.h> 59 __COPYRIGHT("@(#) Copyright (c) 2008, 2010\ 60 The NetBSD Foundation, inc. All rights reserved."); 61 __RCSID("$NetBSD: t_sem.c,v 1.2 2010/11/08 13:05:49 njoly Exp $"); 62 63 #include <sys/wait.h> 64 65 #include <errno.h> 66 #include <fcntl.h> 67 #include <semaphore.h> 68 #include <stdio.h> 69 #include <unistd.h> 70 71 #include <atf-c.h> 72 73 #define NCHILDREN 10 74 75 ATF_TC(basic); 76 ATF_TC_HEAD(basic, tc) 77 { 78 atf_tc_set_md_var(tc, "descr", "Checks basic functionality of POSIX " 79 "semaphores"); 80 } 81 ATF_TC_BODY(basic, tc) 82 { 83 int val; 84 sem_t *sem_b; 85 86 if (sysconf(_SC_SEMAPHORES) == -1) 87 atf_tc_skip("POSIX semaphores not supported"); 88 89 sem_b = sem_open("/sem_b", O_CREAT | O_EXCL, 0644, 0); 90 ATF_REQUIRE(sem_b != SEM_FAILED); 91 92 ATF_REQUIRE_EQ(sem_getvalue(sem_b, &val), 0); 93 ATF_REQUIRE_EQ(val, 0); 94 95 ATF_REQUIRE_EQ(sem_post(sem_b), 0); 96 ATF_REQUIRE_EQ(sem_getvalue(sem_b, &val), 0); 97 ATF_REQUIRE_EQ(val, 1); 98 99 ATF_REQUIRE_EQ(sem_wait(sem_b), 0); 100 ATF_REQUIRE_EQ(sem_trywait(sem_b), -1); 101 ATF_REQUIRE_EQ(errno, EAGAIN); 102 ATF_REQUIRE_EQ(sem_post(sem_b), 0); 103 ATF_REQUIRE_EQ(sem_trywait(sem_b), 0); 104 ATF_REQUIRE_EQ(sem_post(sem_b), 0); 105 ATF_REQUIRE_EQ(sem_wait(sem_b), 0); 106 ATF_REQUIRE_EQ(sem_post(sem_b), 0); 107 108 ATF_REQUIRE_EQ(sem_close(sem_b), 0); 109 ATF_REQUIRE_EQ(sem_unlink("/sem_b"), 0); 110 } 111 112 ATF_TC(child); 113 ATF_TC_HEAD(child, tc) 114 { 115 atf_tc_set_md_var(tc, "descr", "Checks using semaphores to synchronize " 116 "parent with multiple child processes"); 117 } 118 ATF_TC_BODY(child, tc) 119 { 120 pid_t children[NCHILDREN]; 121 unsigned i, j; 122 sem_t *sem_a; 123 int status; 124 125 pid_t pid; 126 127 if (sysconf(_SC_SEMAPHORES) == -1) 128 atf_tc_skip("POSIX semaphores not supported"); 129 130 sem_a = sem_open("/sem_a", O_CREAT | O_EXCL, 0644, 0); 131 ATF_REQUIRE(sem_a != SEM_FAILED); 132 133 for (j = 1; j <= 2; j++) { 134 for (i = 0; i < NCHILDREN; i++) { 135 switch ((pid = fork())) { 136 case -1: 137 atf_tc_fail("fork() returned -1"); 138 case 0: 139 printf("PID %d waiting for semaphore...\n", 140 getpid()); 141 ATF_REQUIRE_MSG(sem_wait(sem_a) == 0, 142 "sem_wait failed; iteration %d", j); 143 printf("PID %d got semaphore\n", getpid()); 144 _exit(0); 145 default: 146 children[i] = pid; 147 break; 148 } 149 } 150 151 for (i = 0; i < NCHILDREN; i++) { 152 sleep(1); 153 printf("main loop %d: posting...\n", j); 154 ATF_REQUIRE_EQ(sem_post(sem_a), 0); 155 } 156 157 for (i = 0; i < NCHILDREN; i++) { 158 ATF_REQUIRE_EQ(waitpid(children[i], &status, 0), children[i]); 159 ATF_REQUIRE(WIFEXITED(status)); 160 ATF_REQUIRE_EQ(WEXITSTATUS(status), 0); 161 } 162 } 163 164 ATF_REQUIRE_EQ(sem_close(sem_a), 0); 165 ATF_REQUIRE_EQ(sem_unlink("/sem_a"), 0); 166 } 167 168 ATF_TP_ADD_TCS(tp) 169 { 170 171 ATF_TP_ADD_TC(tp, basic); 172 ATF_TP_ADD_TC(tp, child); 173 174 return atf_no_error(); 175 } 176
Indexes created Thu Oct 02 14:10:14 GMT 2025