1 /* 2 * Copyright (c) 2003, Intel Corporation. All rights reserved. 3 * Created by: majid.awad REMOVE-THIS AT intel DOT com 4 * This file is licensed under the GPL license. For the full content 5 * of this license, see the COPYING file at the top level of this 6 * source tree. 7 */ 8 9 /* 10 * sem_post() can be entered into again if interrupted by a signal 11 * --> This is tough to do with 100% guarantees. This test does a 12 * best attempt. 13 * 14 * 1) Set up a signal catching function for SIGALRM. 15 * 2) Set up a semaphore 16 * 3) Call sleep(1) and then alarm(1) 17 * 4) Call sempost() immediately after (thinking that alarm(1) will interrupt 18 * 5) If sempost() succeeds (verified if val is incremented by 1), 19 * test passes. Otherwise, failure. 20 */ 21 22 #include <stdio.h> 23 #include <unistd.h> 24 #include <semaphore.h> 25 #include <fcntl.h> 26 #include <signal.h> 27 #include <stdlib.h> 28 #include "posixtest.h" 29 30 #define TEST "5-1" 31 #define FUNCTION "sem_post" 32 #define ERROR_PREFIX "unexpected error: " FUNCTION " " TEST ": " 33 34 #define SEMINITVAL 0 //initial value of semaphore = 0 35 36 sem_t *gsemp; 37 38 void sighdl(int sig) 39 { 40 return; 41 } 42 43 int main(void) 44 { 45 char semname[28]; 46 int val; 47 48 sprintf(semname, "/" FUNCTION "_" TEST "_%d", getpid()); 49 50 gsemp = sem_open(semname, O_CREAT, 0777, SEMINITVAL); 51 if (gsemp == SEM_FAILED || gsemp == NULL) { 52 perror(ERROR_PREFIX "sem_open"); 53 return PTS_UNRESOLVED; 54 } 55 signal(SIGALRM, sighdl); 56 sleep(1); 57 alarm(1); 58 59 if (sem_post(gsemp) == -1) { 60 perror(ERROR_PREFIX "sem_post"); 61 exit(PTS_UNRESOLVED); 62 } 63 64 /* Checking if the value of the Semaphore incremented by one */ 65 if (sem_getvalue(gsemp, &val) == -1) { 66 perror(ERROR_PREFIX "sem_getvalue"); 67 return PTS_UNRESOLVED; 68 } 69 if (val != SEMINITVAL + 1) { 70 #ifdef DEBUG 71 printf("semaphore value was not incremented\n"); 72 #endif 73 printf("TEST FAILED\n"); 74 return PTS_FAIL; 75 } 76 #ifdef DEBUG 77 printf("semaphore value was %d\n", val); 78 #endif 79 80 printf("TEST PASSED\n"); 81 sem_close(gsemp); 82 sem_unlink(semname); 83 return PTS_PASS; 84 } 85
