Attachment 142353 Details for Bug 189353 – sem_test.c

sem_test.c

sem_test.c (text/plain), 1.79 KB, created by joris on 2014-05-04 13:46:43 UTC

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Creator: joris

Created: 2014-05-04 13:46:43 UTC

Size: 1.79 KB

patch

obsolete

>#include <fcntl.h>
>#include <sys/stat.h>
>#include <sys/wait.h>
>#include <sys/types.h>
>#include <semaphore.h>
>
>#include <stdio.h>
>#include <unistd.h>
>
>#include <err.h>
>#include <errno.h>
>
>
>int main() {
>	pid_t pid;
>	sem_t *sem1, *sem2;
>	int error, saved_errno, status;
>	int v1, v2;
>	int pd[2];
>	char er[1];
>	char ok[1];
>	char buf[1];
>	size_t size;
>
>	*er = 'X';
>	*ok = 'O';
>
>	if (pipe(pd) == -1)
>		err(1, "Cannot create sync pipe");
>
>	sem1 = sem_open("/test-sem", O_CREAT | O_EXCL, S_IRWXU, 1);
>	if (sem1 == SEM_FAILED)
>		err(1,"Cannot create test /test-sem semaphore");
>
>	char c = getchar();
>	pid = fork();
>
>	if ( pid == -1)
>		err(1, "Unable to fork test process");
>
>	if (pid == 0) {
>
>		close(pd[0]);
>
>		error = sem_unlink("/test-sem");
>
>		if (error) {
>			perror("Cannot unlink semaphore /test-sem");
>			goto error;
>		}
>
>		sem2 = sem_open("/test-sem", O_CREAT | O_EXCL, S_IRWXU, 2);
>
>		if (sem2 == SEM_FAILED) {
>			perror("Cannot re-create semaphore /test-sem");
>			goto error;
>		}
>
>		write(pd[1], ok, 1);
>
>		error = wait(&status);
>		if (error && errno == EINTR)
>			goto error;
>
>		return(status);
>error:
>		write(pd[1], er, 1);
>		close(pd[1]);
>		error = wait(&status);
>		if (error && errno == EINTR)
>			goto error;
>
>		errx(1, "TEST UNRESOLVED");
>
>		return(1);
>
>	} else {
>
>		close(pd[1]);
>		size = read(pd[0], buf, 1);
>
>		if (size != 1)
>			err(2, "process 2 cannot wait for process 1");
>
>		if (*buf == *er)
>			errx(2, "Test error");
>		else {
>
>			sem2 = sem_open("/test-sem", 0);
>
>			if (sem2 == SEM_FAILED)
>				err(2, "process 2 failed reopeing semaphore");
>
>			// sem_unlink("/test-sem");
>
>			sem_getvalue(sem1, &v1);
>			sem_getvalue(sem2, &v2);
>			printf("v1 = %d and v2 = %d\n", v1, v2);
>			if (v1 == v2) {
>				errx(2, "*** TEST FAILED. NOT POSIX ***");
>			} else {
>				errx(0, "*** TEST SUCCESS. POSIX CONFORMANT ***");
>			}
>		}
>
>	}
>}
>

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