// 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 <linux/types.h>
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#include <poll.h>
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#include <signal.h>
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#include <stdbool.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 <syscall.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include "pidfd.h"
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#include "../kselftest.h"
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static bool timeout;
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static void handle_alarm(int sig)
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{
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timeout = true;
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}
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int main(int argc, char **argv)
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{
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struct pollfd fds;
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int iter, nevents;
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int nr_iterations = 10000;
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fds.events = POLLIN;
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if (argc > 2)
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ksft_exit_fail_msg("Unexpected command line argument\n");
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if (argc == 2) {
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nr_iterations = atoi(argv[1]);
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if (nr_iterations <= 0)
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ksft_exit_fail_msg("invalid input parameter %s\n",
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argv[1]);
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}
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ksft_print_msg("running pidfd poll test for %d iterations\n",
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nr_iterations);
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for (iter = 0; iter < nr_iterations; iter++) {
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int pidfd;
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int child_pid = fork();
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if (child_pid < 0) {
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if (errno == EAGAIN) {
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iter--;
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continue;
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}
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ksft_exit_fail_msg(
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"%s - failed to fork a child process\n",
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strerror(errno));
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}
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if (child_pid == 0) {
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/* Child process just sleeps for a min and exits */
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sleep(60);
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exit(EXIT_SUCCESS);
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}
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/* Parent kills the child and waits for its death */
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pidfd = sys_pidfd_open(child_pid, 0);
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if (pidfd < 0)
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ksft_exit_fail_msg("%s - pidfd_open failed\n",
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strerror(errno));
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/* Setup 3 sec alarm - plenty of time */
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if (signal(SIGALRM, handle_alarm) == SIG_ERR)
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ksft_exit_fail_msg("%s - signal failed\n",
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strerror(errno));
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alarm(3);
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/* Send SIGKILL to the child */
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if (sys_pidfd_send_signal(pidfd, SIGKILL, NULL, 0))
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ksft_exit_fail_msg("%s - pidfd_send_signal failed\n",
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strerror(errno));
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/* Wait for the death notification */
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fds.fd = pidfd;
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nevents = poll(&fds, 1, -1);
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/* Check for error conditions */
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if (nevents < 0)
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ksft_exit_fail_msg("%s - poll failed\n",
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strerror(errno));
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if (nevents != 1)
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ksft_exit_fail_msg("unexpected poll result: %d\n",
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nevents);
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if (!(fds.revents & POLLIN))
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ksft_exit_fail_msg(
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"unexpected event type received: 0x%x\n",
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fds.revents);
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if (timeout)
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ksft_exit_fail_msg(
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"death notification wait timeout\n");
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close(pidfd);
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/* Wait for child to prevent zombies */
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if (waitpid(child_pid, NULL, 0) < 0)
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ksft_exit_fail_msg("%s - waitpid failed\n",
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strerror(errno));
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}
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ksft_test_result_pass("pidfd poll test: pass\n");
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return ksft_exit_pass();
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}
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