testcases/open_posix_testsuite/conformance/interfaces/sigsuspend/6-1.c

/*
 * Copyright (c) 2003, Intel Corporation. All rights reserved.
 * Created by:  salwan.searty REMOVE-THIS AT intel DOT com
 * This file is licensed under the GPL license.  For the full content
 * of this license, see the COPYING file at the top level of this
 * source tree.

 Assumption: The test assumes that this program is run under normal conditions,
 and not when the processor and other resources are too stressed.

 Steps:
 1. Fork() a child process. Have the child suspend itself.
 2. From the parent, send the child a SIGUSR1 signal so that the child returns from
    suspension.
 3. In the child process, make sure that sigsuspend returns a -1 and pass that info
    to the parent process.

*/

#include <signal.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "posixtest.h"

void handler(int signo)
{
	printf("Now inside signal handler\n");
}

int main()
{
	pid_t pid;
	pid = fork();

	if (pid == 0) {
		/* child */

	        sigset_t tempmask;

	        struct sigaction act;

	        act.sa_handler = handler;
	        act.sa_flags=0;
	        sigemptyset(&act.sa_mask);

	        sigemptyset(&tempmask);

	        if (sigaction(SIGUSR1,  &act, 0) == -1) {
	                perror("Unexpected error while attempting to pre-conditions");
                	return 3;
	        }

		printf("suspending child\n");
	        if (sigsuspend(&tempmask) != -1) {
	                perror("sigsuspend error");
			return 1;
		}
	        printf("returned from suspend\n");

		sleep(1);
		return 2;

	} else {
		int s;
		int exit_status;

		/* parent */
		sleep(1);

		printf("parent sending child a SIGUSR1 signal\n");
		kill (pid, SIGUSR1);

		if (wait(&s) == -1) {
			perror("Unexpected error while setting up test "
			       "pre-conditions");
			return PTS_UNRESOLVED;
		}

		exit_status = WEXITSTATUS(s);

		printf("Exit status from child is %d\n", exit_status);

                if (exit_status == 1) {
			printf("Test FAILED\n");
                        return PTS_FAIL;
                }

                if (exit_status == 2) {
			printf("Test PASSED\n");
                        return PTS_PASS;
                }

                if (exit_status == 3) {
                        return PTS_UNRESOLVED;
                }

		printf("Child didn't exit with any of the expected return codes\n");
		return PTS_UNRESOLVED;
	}
}