/*
* Copyright (c) 2005, 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 assertions:
*
* If SA_SIGINFO is set and realtime signals extension is supported, queueable
* signals generated by sigqueue or some other functions are delivered in FIFO
* order.

* The steps are:
* -> Test for RTS extension support
* -> install a handler for SIGRTMAX signal with SA_SIGINFO set.
* -> Mask this signal
* -> Generate the signal several imes with sigqueue and known user values.
* -> unmask the signal
* -> check that the signals are delivered in order.

* The test fails if the signals are not delivered in FIFO order.
*/


/* This test uses some XSI features */

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

#include <signal.h>
#include <errno.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 QUEUELENGTH 10

/******************************************************************************/
/***************************    Test case   ***********************************/
/******************************************************************************/

static volatile sig_atomic_t latest;

void handler(int sig LTP_ATTRIBUTE_UNUSED, siginfo_t *info,
	void *context LTP_ATTRIBUTE_UNUSED)
{
	if (info->si_signo != SIGRTMAX) {
		output("Received unexpected signal %d\n", info->si_signo);
	} else {
		latest++;

		if (latest != info->si_value.sival_int) {
			output("Got signal %d, expected %d!\n",
			       info->si_value.sival_int, latest);
			FAILED("Wrong signal delivered -- no FIFO order?");
		}
	}
}

/* main function */
int main(void)
{
	int ret;
	long rts;

	struct sigaction sa;
	union sigval sv;
	sigset_t mask;

	/* Initialize output */
	output_init();

	/* Test the RTS extension */
	rts = sysconf(_SC_REALTIME_SIGNALS);

	if (rts < 0L) {
		UNTESTED("This test needs the RTS extension");
	}

	/* Set the signal handler */
	sa.sa_flags = SA_SIGINFO;

	sa.sa_sigaction = handler;

	ret = sigemptyset(&sa.sa_mask);

	if (ret != 0) {
		UNRESOLVED(ret, "Failed to empty signal set");
	}

	/* Install the signal handler for SIGRTMAX */
	ret = sigaction(SIGRTMAX, &sa, 0);

	if (ret != 0) {
		UNRESOLVED(ret, "Failed to set signal handler");
	}

	/* Mask this signal */
	ret = sigemptyset(&mask);

	if (ret != 0) {
		UNRESOLVED(ret, "An error occured while initializing mask");
	}

	ret = sigaddset(&mask, SIGRTMAX);

	if (ret != 0) {
		UNRESOLVED(ret, "Failed to add SIGRTMAX to signal set");
	}

	ret = sigprocmask(SIG_BLOCK, &mask, NULL);

	if (ret != 0) {
		UNRESOLVED(ret, "Failed to set process signal mask");
	}

	/* Now queue the signal to be pending */

	for (sv.sival_int = 1; sv.sival_int <= QUEUELENGTH; sv.sival_int++) {
		ret = sigqueue(getpid(), SIGRTMAX, sv);

		if (ret != 0) {
			UNRESOLVED(ret, "Failed to queue the signal");
		}
	}

	if (latest != 0) {
		FAILED("Signal was delivered while masked??");
	}

	/* And finally unmask the signal so it is delivered */
	ret = sigprocmask(SIG_UNBLOCK, &mask, NULL);

	if (ret != 0) {
		UNRESOLVED(ret, "Failed to set process signal mask");
	}

	sched_yield();

	/* Check the signal has been delivered as expected */

	if (latest != QUEUELENGTH) {
		output("Only %d signal delivered instead of %d\n", latest,
		       QUEUELENGTH);

		if (latest == 1) {
			UNTESTED
			    ("It seems like SIGRTMAX is not a queuable signal here?");
		}
	}

	/* Test passed */
#if VERBOSE > 0

	output("Test passed\n");

#endif

	PASSED;
}