tools/testing/selftests/pidfd/pidfd_fdinfo_test.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/pidfd/pidfd_fdinfo_test.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/pidfd/pidfd_fdinfo_test.c
Extension
.c
Size
7074 bytes
Lines
313
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 error {
	int  code;
	char msg[512];
};

static int error_set(struct error *err, int code, const char *fmt, ...)
{
	va_list args;
	int r;

	if (code == PIDFD_PASS || !err || err->code != PIDFD_PASS)
		return code;

	err->code = code;
	va_start(args, fmt);
	r = vsnprintf(err->msg, sizeof(err->msg), fmt, args);
	assert((size_t)r < sizeof(err->msg));
	va_end(args);

	return code;
}

static void error_report(struct error *err, const char *test_name)
{
	switch (err->code) {
	case PIDFD_ERROR:
		ksft_exit_fail_msg("%s test: Fatal: %s\n", test_name, err->msg);
		break;

	case PIDFD_FAIL:
		/* will be: not ok %d # error %s test: %s */
		ksft_test_result_error("%s test: %s\n", test_name, err->msg);
		break;

	case PIDFD_SKIP:
		/* will be: not ok %d # SKIP %s test: %s */
		ksft_test_result_skip("%s test: %s\n", test_name, err->msg);
		break;

	case PIDFD_XFAIL:
		ksft_test_result_pass("%s test: Expected failure: %s\n",
				      test_name, err->msg);
		break;

	case PIDFD_PASS:
		ksft_test_result_pass("%s test: Passed\n", test_name);
		break;

	default:
		ksft_exit_fail_msg("%s test: Unknown code: %d %s\n",
				   test_name, err->code, err->msg);
		break;
	}
}

static inline int error_check(struct error *err, const char *test_name)
{
	/* In case of error we bail out and terminate the test program */
	if (err->code == PIDFD_ERROR)
		error_report(err, test_name);

	return err->code;
}

#define CHILD_STACK_SIZE 8192

struct child {
	char *stack;
	pid_t pid;
	int   fd;
};

static struct child clone_newns(int (*fn)(void *), void *args,
				struct error *err)
{
	static int flags = CLONE_PIDFD | CLONE_NEWPID | CLONE_NEWNS | SIGCHLD;
	struct child ret;

	if (!(flags & CLONE_NEWUSER) && geteuid() != 0)
		flags |= CLONE_NEWUSER;

	ret.stack = mmap(NULL, CHILD_STACK_SIZE, PROT_READ | PROT_WRITE,
			 MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, -1, 0);
	if (ret.stack == MAP_FAILED) {
		error_set(err, -1, "mmap of stack failed (errno %d)", errno);
		return ret;
	}

#ifdef __ia64__
	ret.pid = __clone2(fn, ret.stack, CHILD_STACK_SIZE, flags, args, &ret.fd);

Annotation

Implementation Notes