// 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 : setpriority.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
int *GET_WSD_VAR_NAME(ProcPriority, g)();
#define ProcPriority (*GET_WSD_VAR_NAME(ProcPriority, g)())
#else
extern int ProcPriority;
#endif //EMULATOR
/*
This function checks where in the priority range the parameter falls
and sets the priority accordingly.
It returns -1 if the paramter is out of range.
*/
TProcessPriority convPri( int pri)
{
TProcessPriority priority = TProcessPriority(-1);
if((pri >= UPPER_LIMIT_PRIORITY_LOWEST) &&
( pri <= LOWER_LIMIT_PRIORITY_LOWEST))
{
priority = EPriorityLow;
}
else if ((pri >= UPPER_LIMIT_PRIORITY_BELOW_NORMAL) &&
( pri <= LOWER_LIMIT_PRIORITY_BELOW_NORMAL))
{
priority = EPriorityBackground;
}
else if((pri >= UPPER_LIMIT_PRIORITY_NORMAL) &&
( pri <= LOWER_LIMIT_PRIORITY_NORMAL))
{
priority = EPriorityForeground;
}
else if((pri >= UPPER_LIMIT_PRIORITY_ABOVE_NORMAL) &&
( pri <= LOWER_LIMIT_PRIORITY_ABOVE_NORMAL))
{
priority = EPriorityHigh;
}
/* If priority is anything other than this,
Symbian wont change it for user process/thread*/
return priority;
}
/*
This function setpriority() 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 0 on success and -1 on failure.
The function setpriority() 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. For effective change in priority,
the 'value' should be in the range of -15 to 19. If the 'value' is
greater than the greatest or less than the least, it will set the 'value'
to the maximum or minimum value respectively.
*/
extern "C" {
EXPORT_C int setpriority( int which, int who, int value )
{
int retval = -1;
if((who == 0) && (which == PRIO_PROCESS ))
{
if(value > LOWER_LIMIT_PRIORITY_LOWEST)
{
value = LOWER_LIMIT_PRIORITY_LOWEST;
}
if(value < UPPER_LIMIT_PRIORITY_HIGHEST)
{
value = UPPER_LIMIT_PRIORITY_ABOVE_NORMAL;
}
int priority = convPri( value );
if( priority != -1 )
{
RProcess pro;
pro.SetPriority( convPri( value ) );
ProcPriority = value;
retval = 0;
}
}
//handling error case and not supported case
if( retval == -1 )
{
errno = ENOSYS;
}
return retval;
}
} //extern "C"