tools/testing/selftests/clone3/clone3_clear_sighand.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/clone3/clone3_clear_sighand.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/clone3/clone3_clear_sighand.c
Extension
.c
Size
2509 bytes
Lines
125
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

#define _GNU_SOURCE
#include <errno.h>
#include <sched.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <sys/syscall.h>
#include <sys/wait.h>

#include "kselftest.h"
#include "clone3_selftests.h"

static void nop_handler(int signo)
{
}

static int wait_for_pid(pid_t pid)
{
	int status, ret;

again:
	ret = waitpid(pid, &status, 0);
	if (ret == -1) {
		if (errno == EINTR)
			goto again;

		return -1;
	}

	if (!WIFEXITED(status))
		return -1;

	return WEXITSTATUS(status);
}

static void test_clone3_clear_sighand(void)
{
	int ret;
	pid_t pid;
	struct __clone_args args = {};
	struct sigaction act;

	/*
	 * Check that CLONE_CLEAR_SIGHAND and CLONE_SIGHAND are mutually
	 * exclusive.
	 */
	args.flags |= CLONE_CLEAR_SIGHAND | CLONE_SIGHAND;
	args.exit_signal = SIGCHLD;
	pid = sys_clone3(&args, sizeof(args));
	if (pid > 0)
		ksft_exit_fail_msg(
			"clone3(CLONE_CLEAR_SIGHAND | CLONE_SIGHAND) succeeded\n");

	act.sa_handler = nop_handler;
	ret = sigemptyset(&act.sa_mask);
	if (ret < 0)
		ksft_exit_fail_msg("%s - sigemptyset() failed\n",
				   strerror(errno));

	act.sa_flags = 0;

	/* Register signal handler for SIGUSR1 */
	ret = sigaction(SIGUSR1, &act, NULL);
	if (ret < 0)
		ksft_exit_fail_msg(
			"%s - sigaction(SIGUSR1, &act, NULL) failed\n",
			strerror(errno));

	/* Register signal handler for SIGUSR2 */
	ret = sigaction(SIGUSR2, &act, NULL);
	if (ret < 0)
		ksft_exit_fail_msg(
			"%s - sigaction(SIGUSR2, &act, NULL) failed\n",
			strerror(errno));

	/* Check that CLONE_CLEAR_SIGHAND works. */
	args.flags = CLONE_CLEAR_SIGHAND;
	pid = sys_clone3(&args, sizeof(args));
	if (pid < 0)
		ksft_exit_fail_msg("%s - clone3(CLONE_CLEAR_SIGHAND) failed\n",
				   strerror(errno));

	if (pid == 0) {
		ret = sigaction(SIGUSR1, NULL, &act);
		if (ret < 0)
			exit(EXIT_FAILURE);

Annotation

Implementation Notes