/*
* 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., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.


* This sample test aims to check the following assertion:
*
* For the SCHED_FIFO and SCHED_RR scheduling policies, 
* the child process inherits the policy and priority
* settings of the parent process during a fork() function.

* The steps are:
* -> Change the parent's scheduling policy and parameter
* -> fork
* -> check the child inherited the same policy.

* The test fails if the child does not inherit the parent's values.

*/


/* We are testing conformance to IEEE Std 1003.1, 2003 Edition */
#define _POSIX_C_SOURCE 200112L

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

#include <sys/wait.h>
 #include <errno.h>

#include <sched.h>

/********************************************************************************************/
/******************************   Test framework   *****************************************/
/********************************************************************************************/
#include "testfrmw.h"
 #include "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 POLICY SCHED_FIFO

/********************************************************************************************/
/***********************************    Test case   *****************************************/
/********************************************************************************************/
/* The main test function. */
int main( int argc, char * argv[] )
{
	int ret, param, status;
	pid_t child, ctl;

	struct sched_param sp;

	/* Initialize output */
	output_init();

	/* Change process policy and parameters */
	sp.sched_priority = param = sched_get_priority_max( POLICY );

	if ( sp.sched_priority == -1 )
	{
		UNRESOLVED( errno, "Failed to get max priority value" );
	}

	ret = sched_setscheduler( 0, POLICY, &sp );

	if ( ret == -1 )
	{
		UNRESOLVED( errno, "Failed to change process scheduling policy" );
	}

	/* Create the child */
	child = fork();

	if ( child == ( pid_t ) - 1 )
	{
		UNRESOLVED( errno, "Failed to fork" );
	}

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

		/* Check the scheduling policy */
		ret = sched_getscheduler( 0 );

		if ( ret == -1 )
		{
			UNRESOLVED( errno, "Failed to read scheduling policy in child" );
		}

		if ( ret != POLICY )
		{
			FAILED( "The scheduling policy was not inherited" );
		}

		ret = sched_getparam( 0, &sp );

		if ( ret != 0 )
		{
			UNRESOLVED( errno, "Failed to read scheduling parameter in child" );
		}

		if ( sp.sched_priority != param )
		{
			FAILED( "The scheduling parameter was not inherited" );
		}

		/* We're done */
		exit( PTS_PASS );
	}

	/* Parent joins the child */
	ctl = waitpid( child, &status, 0 );

	if ( ctl != child )
	{
		UNRESOLVED( errno, "Waitpid returned the wrong PID" );
	}

	if ( ( !WIFEXITED( status ) ) || ( WEXITSTATUS( status ) != PTS_PASS ) )
	{
		FAILED( "Child exited abnormally" );
	}


	/* Test passed */
#if VERBOSE > 0
	output( "Test passed\n" );

#endif
	PASSED;
}