tools/testing/selftests/ipc/msgque.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/ipc/msgque.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/ipc/msgque.c
Extension
.c
Size
5777 bytes
Lines
257
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct msg1 {
	int msize;
	long mtype;
	char mtext[MAX_MSG_SIZE];
};

#define TEST_STRING "Test sysv5 msg"
#define MSG_TYPE 1

#define ANOTHER_TEST_STRING "Yet another test sysv5 msg"
#define ANOTHER_MSG_TYPE 26538

struct msgque_data {
	key_t key;
	int msq_id;
	int qbytes;
	int qnum;
	int mode;
	struct msg1 *messages;
};

int restore_queue(struct msgque_data *msgque)
{
	int fd, ret, id, i;
	char buf[32];

	fd = open("/proc/sys/kernel/msg_next_id", O_WRONLY);
	if (fd == -1) {
		ksft_test_result_fail("Failed to open /proc/sys/kernel/msg_next_id\n");
		return -errno;
	}
	sprintf(buf, "%d", msgque->msq_id);

	ret = write(fd, buf, strlen(buf));
	if (ret != strlen(buf)) {
		ksft_test_result_fail("Failed to write to /proc/sys/kernel/msg_next_id\n");
		return -errno;
	}

	id = msgget(msgque->key, msgque->mode | IPC_CREAT | IPC_EXCL);
	if (id == -1) {
		ksft_test_result_fail("Failed to create queue\n");
		return -errno;
	}

	if (id != msgque->msq_id) {
		ksft_test_result_fail("Restored queue has wrong id (%d instead of %d)\n"
								, id, msgque->msq_id);
		ret = -EFAULT;
		goto destroy;
	}

	for (i = 0; i < msgque->qnum; i++) {
		if (msgsnd(msgque->msq_id, &msgque->messages[i].mtype,
			   msgque->messages[i].msize, IPC_NOWAIT) != 0) {
			ksft_test_result_fail("msgsnd failed (%m)\n");
			ret = -errno;
			goto destroy;
		}
	}
	return 0;

destroy:
	if (msgctl(id, IPC_RMID, NULL))
		printf("Failed to destroy queue: %d\n", -errno);
	return ret;
}

int check_and_destroy_queue(struct msgque_data *msgque)
{
	struct msg1 message;
	int cnt = 0, ret;

	while (1) {
		ret = msgrcv(msgque->msq_id, &message.mtype, MAX_MSG_SIZE,
				0, IPC_NOWAIT);
		if (ret < 0) {
			if (errno == ENOMSG)
				break;
			ksft_test_result_fail("Failed to read IPC message: %m\n");
			ret = -errno;
			goto err;
		}
		if (ret != msgque->messages[cnt].msize) {
			ksft_test_result_fail("Wrong message size: %d (expected %d)\n", ret, msgque->messages[cnt].msize);
			ret = -EINVAL;
			goto err;
		}
		if (message.mtype != msgque->messages[cnt].mtype) {
			ksft_test_result_fail("Wrong message type\n");

Annotation

Implementation Notes