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_trywait shall try to lock the unlocked semaphore and decrement 11 * the semaphore value by one. 12 */ 13 14 #include <stdio.h> 15 #include <errno.h> 16 #include <unistd.h> 17 #include <semaphore.h> 18 #include <sys/stat.h> 19 #include <fcntl.h> 20 #include "posixtest.h" 21 22 #define TEST "11-1" 23 #define FUNCTION "sem_trywait" 24 #define ERROR_PREFIX "unexpected error: " FUNCTION " " TEST ": " 25 26 int main(void) 27 { 28 sem_t *mysemp; 29 char semname[28]; 30 int val; 31 32 sprintf(semname, "/" FUNCTION "_" TEST "_%d", getpid()); 33 34 /* Initial value of Semaphore is 1 */ 35 mysemp = sem_open(semname, O_CREAT, 0777, 1); 36 if (mysemp == SEM_FAILED || mysemp == NULL) { 37 perror(ERROR_PREFIX "sem_open"); 38 return PTS_UNRESOLVED; 39 } 40 41 /* Lock Semaphore by sem_trywait */ 42 if (sem_trywait(mysemp) == -1) { 43 perror(ERROR_PREFIX "sem_wait"); 44 return PTS_UNRESOLVED; 45 } 46 47 /* Value of Semaphore */ 48 if (sem_getvalue(mysemp, &val) == -1) { 49 perror(ERROR_PREFIX "sem_getvalue"); 50 return PTS_UNRESOLVED; 51 52 /* Checking if the value of the Semaphore decremented by one */ 53 } else if (val == 0) { 54 puts("TEST PASSED"); 55 sem_unlink(semname); 56 sem_close(mysemp); 57 return PTS_PASS; 58 } else { 59 puts("TEST FAILED"); 60 return PTS_FAIL; 61 } 62 } 63
