/*
* Copyright (c) 2004, Bull S.A..  All rights reserved.
* Created by: Sebastien Decugis

* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

* This sample test aims to check the following assertion:
*
* The function does not return EINTR

* The steps are:
* -> kill a thread which calls pthread_kill
* -> check that EINTR is never returned

*/


/********************************************************************************************/
/****************************** standard includes *****************************************/
/********************************************************************************************/
#include <pthread.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <semaphore.h>
#include <errno.h>
#include <signal.h>

/********************************************************************************************/
/******************************   Test framework   *****************************************/
/********************************************************************************************/
#include "../testfrmw/testfrmw.h"
#include "../testfrmw/testfrmw.c"
/* This header is responsible for defining the following macros:
 * UNRESOLVED(ret, descr);
 *    where descr is a description of the error and ret is an int (error code for example)
 * FAILED(descr);
 *    where descr is a short text saying why the test has failed.
 * PASSED();
 *    No parameter.
 *
 * Both three macros shall terminate the calling process.
 * The testcase shall not terminate in any other maneer.
 *
 * The other file defines the functions
 * void output_init()
 * void output(char * string, ...)
 *
 * Those may be used to output information.
 */

/********************************************************************************************/
/********************************** Configuration ******************************************/
/********************************************************************************************/
#ifndef VERBOSE
#define VERBOSE 1
#endif

#define WITH_SYNCHRO

/********************************************************************************************/
/***********************************    Test cases  *****************************************/
/********************************************************************************************/

char do_it = 1;
unsigned long count_ope = 0;
#ifdef WITH_SYNCHRO
sem_t semsig1;
sem_t semsig2;
unsigned long count_sig = 0;
#endif

sigset_t usersigs;

typedef struct {
	int sig;
#ifdef WITH_SYNCHRO
	sem_t *sem;
#endif
} thestruct;

/* the following function keeps on sending the signal to the process */
void *sendsig(void *arg)
{
	thestruct *thearg = (thestruct *) arg;
	int ret;
	pid_t process;

	process = getpid();

	/* We block the signals SIGUSR1 and SIGUSR2 for this THREAD */
	ret = pthread_sigmask(SIG_BLOCK, &usersigs, NULL);

	if (ret != 0) {
		UNRESOLVED(ret,
			   "Unable to block SIGUSR1 and SIGUSR2 in signal thread");
	}

	while (do_it) {
#ifdef WITH_SYNCHRO

		if ((ret = sem_wait(thearg->sem))) {
			UNRESOLVED(errno, "Sem_wait in sendsig");
		}

		count_sig++;
#endif

		ret = kill(process, thearg->sig);

		if (ret != 0) {
			UNRESOLVED(errno, "Kill in sendsig");
		}

	}

	return NULL;
}

/* Next are the signal handlers. */
/* This one is registered for signal SIGUSR1 */
void sighdl1(int sig LTP_ATTRIBUTE_UNUSED)
{
#ifdef WITH_SYNCHRO

	if (sem_post(&semsig1)) {
		UNRESOLVED(errno, "Sem_post in signal handler 1");
	}
#endif
}

/* This one is registered for signal SIGUSR2 */
void sighdl2(int sig LTP_ATTRIBUTE_UNUSED)
{
#ifdef WITH_SYNCHRO

	if (sem_post(&semsig2)) {
		UNRESOLVED(errno, "Sem_post in signal handler 2");
	}
#endif
}

int init_ctl;
/* Init function */
void initializer(void)
{
	init_ctl++;
	return;
}

/* Test function -- calls pthread_kill() and checks that EINTR is never returned. */
void *test(void *arg LTP_ATTRIBUTE_UNUSED)
{
	int ret = 0;

	/* We don't block the signals SIGUSR1 and SIGUSR2 for this THREAD */
	ret = pthread_sigmask(SIG_UNBLOCK, &usersigs, NULL);

	if (ret != 0) {
		UNRESOLVED(ret,
			   "Unable to unblock SIGUSR1 and SIGUSR2 in worker thread");
	}

	while (do_it) {
		count_ope++;

		ret = pthread_kill(pthread_self(), 0);

		if (ret == EINTR) {
			FAILED("pthread_kill returned EINTR");
		}

		if (ret != 0) {
			UNRESOLVED(ret,
				   "pthread_kill returned an unexpected error");
		}

		ret = pthread_kill(pthread_self(), SIGUSR1);

		if (ret == EINTR) {
			FAILED("pthread_kill returned EINTR");
		}

		if (ret != 0) {
			UNRESOLVED(ret,
				   "pthread_kill returned an unexpected error");
		}
	}

	return NULL;
}

/* Main function */
int main(void)
{
	int ret;
	pthread_t th_work, th_sig1, th_sig2;
	thestruct arg1, arg2;

	struct sigaction sa;

	/* Initialize output routine */
	output_init();

	/* We need to register the signal handlers for the PROCESS */
	sigemptyset(&sa.sa_mask);
	sa.sa_flags = 0;
	sa.sa_handler = sighdl1;

	if ((ret = sigaction(SIGUSR1, &sa, NULL))) {
		UNRESOLVED(ret, "Unable to register signal handler1");
	}

	sa.sa_handler = sighdl2;

	if ((ret = sigaction(SIGUSR2, &sa, NULL))) {
		UNRESOLVED(ret, "Unable to register signal handler2");
	}

	/* We prepare a signal set which includes SIGUSR1 and SIGUSR2 */
	sigemptyset(&usersigs);

	ret = sigaddset(&usersigs, SIGUSR1);

	ret |= sigaddset(&usersigs, SIGUSR2);

	if (ret != 0) {
		UNRESOLVED(ret, "Unable to add SIGUSR1 or 2 to a signal set");
	}

	/* We now block the signals SIGUSR1 and SIGUSR2 for this THREAD */
	ret = pthread_sigmask(SIG_BLOCK, &usersigs, NULL);

	if (ret != 0) {
		UNRESOLVED(ret,
			   "Unable to block SIGUSR1 and SIGUSR2 in main thread");
	}
#ifdef WITH_SYNCHRO
	if (sem_init(&semsig1, 0, 1)) {
		UNRESOLVED(errno, "Semsig1  init");
	}

	if (sem_init(&semsig2, 0, 1)) {
		UNRESOLVED(errno, "Semsig2  init");
	}
#endif

	if ((ret = pthread_create(&th_work, NULL, test, NULL))) {
		UNRESOLVED(ret, "Worker thread creation failed");
	}

	arg1.sig = SIGUSR1;
	arg2.sig = SIGUSR2;
#ifdef WITH_SYNCHRO
	arg1.sem = &semsig1;
	arg2.sem = &semsig2;
#endif

	if ((ret = pthread_create(&th_sig1, NULL, sendsig, (void *)&arg1))) {
		UNRESOLVED(ret, "Signal 1 sender thread creation failed");
	}

	if ((ret = pthread_create(&th_sig2, NULL, sendsig, (void *)&arg2))) {
		UNRESOLVED(ret, "Signal 2 sender thread creation failed");
	}

	/* Let's wait for a while now */
	sleep(1);

	/* Now stop the threads and join them */
	do {
		do_it = 0;
	}
	while (do_it);

	if ((ret = pthread_join(th_sig1, NULL))) {
		UNRESOLVED(ret, "Signal 1 sender thread join failed");
	}

	if ((ret = pthread_join(th_sig2, NULL))) {
		UNRESOLVED(ret, "Signal 2 sender thread join failed");
	}

	if ((ret = pthread_join(th_work, NULL))) {
		UNRESOLVED(ret, "Worker thread join failed");
	}
#if VERBOSE > 0
	output("Test executed successfully.\n");

	output("  %d operations.\n", count_ope);

#ifdef WITH_SYNCHRO
	output("  %d signals were sent meanwhile.\n", count_sig);

#endif
#endif
	PASSED;
}