Mac OS X POSIX semaphore test

posixsemtest.c

// clang -Wall -o posixsemtest posixsemtest.c

#include <stdio.h>
#include <semaphore.h>

int main(int argc, char** argv) {

	if (argc < 2) {
		printf("USAGE: %s <semaphore_name>\n", argv[0]);
		return 1;
	}

	sem_t* semaphore = SEM_FAILED;

	semaphore = sem_open(
		argv[1],
		O_CREAT,
		S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH,
		1
	);
	if (semaphore == (sem_t*)SEM_FAILED) {
		printf("sem_open: SEM_FAILED\n");
		return 1;
	}

	printf("Created POSIX semaphore '%s', press enter to remove it.\n", argv[1]);
	getchar();

	int unlinked = sem_unlink(argv[1]);
	if (unlinked) {
		printf("sem_unlink: error: %i\n", unlinked);
	}

	return 0;
}