/* SPDX-License-Identifier: GPL-2.0 */
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#define _GNU_SOURCE
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#include <errno.h>
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#include <sched.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <sys/syscall.h>
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#include <sys/wait.h>
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#include "../kselftest.h"
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#include "clone3_selftests.h"
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#ifndef CLONE_CLEAR_SIGHAND
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#define CLONE_CLEAR_SIGHAND 0x100000000ULL
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#endif
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static void nop_handler(int signo)
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{
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}
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static int wait_for_pid(pid_t pid)
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{
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int status, ret;
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again:
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ret = waitpid(pid, &status, 0);
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if (ret == -1) {
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if (errno == EINTR)
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goto again;
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return -1;
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}
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if (!WIFEXITED(status))
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return -1;
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return WEXITSTATUS(status);
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}
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static void test_clone3_clear_sighand(void)
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{
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int ret;
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pid_t pid;
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struct __clone_args args = {};
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struct sigaction act;
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/*
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* Check that CLONE_CLEAR_SIGHAND and CLONE_SIGHAND are mutually
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* exclusive.
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*/
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args.flags |= CLONE_CLEAR_SIGHAND | CLONE_SIGHAND;
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args.exit_signal = SIGCHLD;
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pid = sys_clone3(&args, sizeof(args));
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if (pid > 0)
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ksft_exit_fail_msg(
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"clone3(CLONE_CLEAR_SIGHAND | CLONE_SIGHAND) succeeded\n");
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act.sa_handler = nop_handler;
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ret = sigemptyset(&act.sa_mask);
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if (ret < 0)
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ksft_exit_fail_msg("%s - sigemptyset() failed\n",
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strerror(errno));
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act.sa_flags = 0;
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/* Register signal handler for SIGUSR1 */
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ret = sigaction(SIGUSR1, &act, NULL);
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if (ret < 0)
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ksft_exit_fail_msg(
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"%s - sigaction(SIGUSR1, &act, NULL) failed\n",
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strerror(errno));
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/* Register signal handler for SIGUSR2 */
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ret = sigaction(SIGUSR2, &act, NULL);
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if (ret < 0)
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ksft_exit_fail_msg(
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"%s - sigaction(SIGUSR2, &act, NULL) failed\n",
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strerror(errno));
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/* Check that CLONE_CLEAR_SIGHAND works. */
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args.flags = CLONE_CLEAR_SIGHAND;
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pid = sys_clone3(&args, sizeof(args));
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if (pid < 0)
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ksft_exit_fail_msg("%s - clone3(CLONE_CLEAR_SIGHAND) failed\n",
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strerror(errno));
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if (pid == 0) {
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ret = sigaction(SIGUSR1, NULL, &act);
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if (ret < 0)
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exit(EXIT_FAILURE);
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if (act.sa_handler != SIG_DFL)
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exit(EXIT_FAILURE);
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ret = sigaction(SIGUSR2, NULL, &act);
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if (ret < 0)
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exit(EXIT_FAILURE);
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if (act.sa_handler != SIG_DFL)
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exit(EXIT_FAILURE);
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exit(EXIT_SUCCESS);
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}
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ret = wait_for_pid(pid);
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if (ret)
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ksft_exit_fail_msg(
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"Failed to clear signal handler for child process\n");
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ksft_test_result_pass("Cleared signal handlers for child process\n");
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}
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int main(int argc, char **argv)
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{
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ksft_print_header();
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ksft_set_plan(1);
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test_clone3_supported();
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test_clone3_clear_sighand();
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return ksft_exit_pass();
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}
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