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1/* SPDX-License-Identifier: GPL-2.0 */2 3#define _GNU_SOURCE4#include <errno.h>5#include <sched.h>6#include <signal.h>7#include <stdio.h>8#include <stdlib.h>9#include <string.h>10#include <unistd.h>11#include <linux/sched.h>12#include <linux/types.h>13#include <sys/syscall.h>14#include <sys/wait.h>15 16#include "../kselftest.h"17#include "clone3_selftests.h"18 19static void nop_handler(int signo)20{21}22 23static int wait_for_pid(pid_t pid)24{25 int status, ret;26 27again:28 ret = waitpid(pid, &status, 0);29 if (ret == -1) {30 if (errno == EINTR)31 goto again;32 33 return -1;34 }35 36 if (!WIFEXITED(status))37 return -1;38 39 return WEXITSTATUS(status);40}41 42static void test_clone3_clear_sighand(void)43{44 int ret;45 pid_t pid;46 struct __clone_args args = {};47 struct sigaction act;48 49 /*50 * Check that CLONE_CLEAR_SIGHAND and CLONE_SIGHAND are mutually51 * exclusive.52 */53 args.flags |= CLONE_CLEAR_SIGHAND | CLONE_SIGHAND;54 args.exit_signal = SIGCHLD;55 pid = sys_clone3(&args, sizeof(args));56 if (pid > 0)57 ksft_exit_fail_msg(58 "clone3(CLONE_CLEAR_SIGHAND | CLONE_SIGHAND) succeeded\n");59 60 act.sa_handler = nop_handler;61 ret = sigemptyset(&act.sa_mask);62 if (ret < 0)63 ksft_exit_fail_msg("%s - sigemptyset() failed\n",64 strerror(errno));65 66 act.sa_flags = 0;67 68 /* Register signal handler for SIGUSR1 */69 ret = sigaction(SIGUSR1, &act, NULL);70 if (ret < 0)71 ksft_exit_fail_msg(72 "%s - sigaction(SIGUSR1, &act, NULL) failed\n",73 strerror(errno));74 75 /* Register signal handler for SIGUSR2 */76 ret = sigaction(SIGUSR2, &act, NULL);77 if (ret < 0)78 ksft_exit_fail_msg(79 "%s - sigaction(SIGUSR2, &act, NULL) failed\n",80 strerror(errno));81 82 /* Check that CLONE_CLEAR_SIGHAND works. */83 args.flags = CLONE_CLEAR_SIGHAND;84 pid = sys_clone3(&args, sizeof(args));85 if (pid < 0)86 ksft_exit_fail_msg("%s - clone3(CLONE_CLEAR_SIGHAND) failed\n",87 strerror(errno));88 89 if (pid == 0) {90 ret = sigaction(SIGUSR1, NULL, &act);91 if (ret < 0)92 exit(EXIT_FAILURE);93 94 if (act.sa_handler != SIG_DFL)95 exit(EXIT_FAILURE);96 97 ret = sigaction(SIGUSR2, NULL, &act);98 if (ret < 0)99 exit(EXIT_FAILURE);100 101 if (act.sa_handler != SIG_DFL)102 exit(EXIT_FAILURE);103 104 exit(EXIT_SUCCESS);105 }106 107 ret = wait_for_pid(pid);108 if (ret)109 ksft_exit_fail_msg(110 "Failed to clear signal handler for child process\n");111 112 ksft_test_result_pass("Cleared signal handlers for child process\n");113}114 115int main(int argc, char **argv)116{117 ksft_print_header();118 ksft_set_plan(1);119 test_clone3_supported();120 121 test_clone3_clear_sighand();122 123 ksft_exit_pass();124}125