a3bf0755f0
After commit f7d5bcd35d42 ("selftests: kselftest: Mark functions that
unconditionally call exit() as __noreturn"), ksft_exit_...() functions
are marked as __noreturn, which means the return type should not be
'int' but 'void' because they are not returning anything (and never were
since exit() has always been called).
To facilitate updating the return type of these functions, remove
'return' before the calls to ksft_exit_{pass,fail}(), as __noreturn
prevents the compiler from warning that a caller of the ksft_exit
functions does not return a value because the program will terminate
upon calling these functions.
Just removing 'return' would have resulted in
!ret ? ksft_exit_pass() : ksft_exit_fail();
so convert that into the more idiomatic
if (ret)
ksft_exit_fail();
ksft_exit_pass();
Reviewed-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
117 lines
2.4 KiB
C
117 lines
2.4 KiB
C
// 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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ksft_exit_pass();
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}
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