sl@0: // Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: // Name        : nice.cpp
sl@0: // Part of     : LIBC
sl@0: // Contains the source for fchdir
sl@0: // Version     : 1.0
sl@0: //
sl@0: 
sl@0: 
sl@0: 
sl@0: #include <sys/time.h>
sl@0: #include <sys/resource.h>
sl@0: #include <errno.h>
sl@0: #include <e32std.h>
sl@0: #include <e32const.h>
sl@0: #include <unistd.h>
sl@0: 
sl@0: extern "C" {
sl@0: 
sl@0: /*
sl@0: The function nice() increases or decreases the priority value by
sl@0: adding the value 'incr' to the current priority.
sl@0: It internally uses getpriority and setpriority to set the priority 
sl@0: to new value.
sl@0: It returns the new value of the priority, which shall be in the range 
sl@0: of -15 to 19. -1 is a legitimate return value, so the user has to check 
sl@0: the errno to be sure of failure.
sl@0: */
sl@0: EXPORT_C int nice(int incr)
sl@0: 	{
sl@0: 	
sl@0: 	int retGetPri = -1;
sl@0: 	int retSetPri = -1;
sl@0: 	int retVal 	  = -1;
sl@0: 	
sl@0: 	if(((retGetPri = getpriority(PRIO_PROCESS, 0)) == -1) && (errno))
sl@0: 		{
sl@0: 		errno = ENOSYS;
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		retSetPri = setpriority(PRIO_PROCESS, 0, retGetPri + incr);
sl@0: 		if(!retSetPri)
sl@0: 			{
sl@0: 			retVal = 0;
sl@0: 			}
sl@0: 		}
sl@0: 	return retVal;
sl@0: 	}
sl@0: 
sl@0: } //extern "C"