[PATCH 3/3] tests: add semop.test

[Dmitry V. Levin]

On Tue, Apr 12, 2016 at 02:57:47PM +0800, Fei Jie wrote:
[...]
> --- /dev/null
> +++ b/tests/semop.c
> @@ -0,0 +1,45 @@
> +#include "tests.h"
> +#include <sys/types.h>
> +#include <sys/ipc.h>
> +#include <sys/sem.h>
> +#include <stdio.h>
> +#include <unistd.h>
> +
> +union semun
> +{
> +	int val;
> +	struct semid_ds *buf;
> +	unsigned short *array;
> +	struct seminfo *__buf;
> +};
> +
> +int
> +main(void)
> +{
> +	int sem_id = semget(IPC_PRIVATE, 1, 0600);
> +	if (sem_id <0)
> +		perror_msg_and_fail("semget");

There are kernels built without CONFIG_SYSVIPC enabled,
so this error shouldn't be treated as fatal.

> +	union semun sem_union;
> +	sem_union.val = 0;
> +	if (semctl(sem_id, 0, SETVAL, sem_union) == -1)
> +		perror_msg_and_fail("semctl");

All resources allocated by semget must be explicitly released,
see e.g. tests/ipc_sem.c


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