tools/testing/selftests/arm64/fp/za-fork.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/arm64/fp/za-fork.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/arm64/fp/za-fork.c
Extension
.c
Size
2024 bytes
Lines
101
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 (!verify_fork()) {
			ksft_print_msg("ZA state invalid in child\n");
			exit(0);
		} else {
			exit(1);
		}
	}
	if (newpid < 0) {
		ksft_print_msg("fork() failed: %d\n", newpid);

		return 0;
	}

	parent_result = verify_fork();
	if (!parent_result)
		ksft_print_msg("ZA state invalid in parent\n");

	for (;;) {
		waiting = waitpid(newpid, &child_status, 0);

		if (waiting < 0) {
			if (errno == EINTR)
				continue;
			ksft_print_msg("waitpid() failed: %d\n", errno);
			return 0;
		}
		if (waiting != newpid) {
			ksft_print_msg("waitpid() returned wrong PID\n");
			return 0;
		}

		if (!WIFEXITED(child_status)) {
			ksft_print_msg("child did not exit\n");
			return 0;
		}

		return WEXITSTATUS(child_status) && parent_result;
	}
}

int main(int argc, char **argv)
{
	int ret, i;

	ksft_print_header();
	ksft_set_plan(EXPECTED_TESTS);

	ksft_print_msg("PID: %d\n", getpid());

	/*
	 * This test is run with nolibc which doesn't support hwcap and
	 * it's probably disproportionate to implement so instead check
	 * for the default vector length configuration in /proc.
	 */
	ret = open("/proc/sys/abi/sme_default_vector_length", O_RDONLY, 0);
	if (ret >= 0) {
		ksft_test_result(fork_test(), "fork_test\n");

	} else {
		ksft_print_msg("SME not supported\n");
		for (i = 0; i < EXPECTED_TESTS; i++) {
			ksft_test_result_skip("fork_test\n");
		}
	}

	ksft_finished();

	return 0;
}

Annotation

Implementation Notes