tools/testing/selftests/user_events/user_events_selftests.h

Source file repositories/reference/linux-study-clean/tools/testing/selftests/user_events/user_events_selftests.h

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/user_events/user_events_selftests.h
Extension
.h
Size
2191 bytes
Lines
115
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

if (mount(NULL, "/sys/kernel/tracing", "tracefs", 0, NULL) != 0) {
			*message = "Cannot mount tracefs";
			*fail = true;
			return false;
		}

		*umount = true;

		ret = stat("/sys/kernel/tracing/README", &buf);
	}

	if (ret == -1) {
		*message = "Cannot access tracefs";
		*fail = true;
		return false;
	}

	return true;
}

static inline bool user_events_enabled(char **message, bool *fail, bool *umount)
{
	struct stat buf;
	int ret;

	*message = "";
	*fail = false;
	*umount = false;

	if (getuid() != 0) {
		*message = "Must be run as root";
		*fail = true;
		return false;
	}

	if (!tracefs_enabled(message, fail, umount))
		return false;

	/* Ensure user_events is installed */
	ret = stat("/sys/kernel/tracing/user_events_data", &buf);

	if (ret == -1) {
		switch (errno) {
		case ENOENT:
			*message = "user_events is not installed";
			return false;

		default:
			*message = "Cannot access user_events_data";
			*fail = true;
			return false;
		}
	}

	return true;
}

#define USER_EVENT_FIXTURE_SETUP(statement, umount) do { \
	char *message; \
	bool fail; \
	if (!user_events_enabled(&message, &fail, &(umount))) { \
		if (fail) { \
			TH_LOG("Setup failed due to: %s", message); \
			ASSERT_FALSE(fail); \
		} \
		SKIP(statement, "Skipping due to: %s", message); \
	} \
} while (0)

#define USER_EVENT_FIXTURE_TEARDOWN(umount) do { \
	if ((umount))  \
		tracefs_unmount(); \
} while (0)

#endif /* _USER_EVENTS_SELFTESTS_H */

Annotation

Implementation Notes