// Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// Name        : getpriority.cpp

// Part of     : LIBC

// Contains the source for fchdir

// Version     : 1.0

//

#include <sys/time.h>

#include <sys/resource.h>

#include <errno.h>

#include <e32std.h>

#include <e32const.h>

#if (defined(__SYMBIAN32__) && (defined(__WINSCW__) || defined(__WINS__)))

#include "libc_wsd_defs.h"

#endif

#ifdef EMULATOR

GET_GLOBAL_VAR_FROM_TLS(ProcPriority, int)

#define ProcPriority (*GET_WSD_VAR_NAME(ProcPriority, g)())

#else //EMULATOR

int ProcPriority = 0;

#endif //EMULATOR

/*

This function checks the range in which the priority of the process falls

and returns the same to the function getpriority(). If the value is out of

range it returns -1.

*/

int convPri( TProcessPriority pri)

	{

	int priority;

	if(((pri == EPriorityLow ) &&

		 ( (ProcPriority >= UPPER_LIMIT_PRIORITY_LOWEST) &&

		 	 ( ProcPriority <= LOWER_LIMIT_PRIORITY_LOWEST) ))||

		( pri == EPriorityBackground &&

		 ( (ProcPriority >= UPPER_LIMIT_PRIORITY_BELOW_NORMAL) &&

		 	 ( ProcPriority <= LOWER_LIMIT_PRIORITY_BELOW_NORMAL) )) ||

		( pri == EPriorityForeground &&

		 ( (ProcPriority >= UPPER_LIMIT_PRIORITY_NORMAL) &&

		 	 ( ProcPriority <= LOWER_LIMIT_PRIORITY_NORMAL) )) ||

		( pri == EPriorityHigh &&

		 ( (ProcPriority >= UPPER_LIMIT_PRIORITY_ABOVE_NORMAL) &&

		 	 ( ProcPriority <= LOWER_LIMIT_PRIORITY_ABOVE_NORMAL) ))||

		( pri == EPriorityRealTimeServer &&

		 ( (ProcPriority >= UPPER_LIMIT_PRIORITY_HIGHEST) &&

		 	 ( ProcPriority <= LOWER_LIMIT_PRIORITY_HIGHEST) )))

		{

		priority = ProcPriority;

		}

	else

		{

		priority = -1;

		errno = EINVAL;

		}		

	return priority;

	}

/*

This function checks if the which and who parameters sent are 

'the process priority' and 'the current process' respectively,

i.e. PROC_PROCESS and 0 respectively. And calls the function 

convPri() to check in which range the priority falls and returns

likewise.

It returns a value in the range -20 to 19 on success and -1 is a 

legitimate return value,so user has to check the errno to be sure 

of failure.

The function getpriority() shall ignore the values PRIO_PGRP,

PRIO_USER as the argument 'which' and any other value other than

0 for 'who' shall not be considered.

*/	

extern "C" {

EXPORT_C int getpriority(int which, int who)

	{

	int priority = -1;

	if ( which == PRIO_PROCESS && who == 0 )

		{

		RProcess pro;

		TProcessPriority pri;

		pri = pro.Priority();		

		priority = convPri( pri );

		}

	else

		{

		errno = ENOSYS;

		}

	return priority;

	}

} //extern "C"