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getpriority.c
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1995-05-28
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/*
* This file is part of ixemul.library for the Amiga.
* Copyright (C) 1991, 1992 Markus M. Wild
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* getpriority.c,v 1.1.1.1 1994/04/04 04:30:22 amiga Exp
*
* getpriority.c,v
* Revision 1.1.1.1 1994/04/04 04:30:22 amiga
* Initial CVS check in.
*
* Revision 1.1 1992/05/14 19:55:40 mwild
* Initial revision
*
*/
#define KERNEL
#include "ixemul.h"
#include "kprintf.h"
#include <sys/time.h>
#include <sys/resource.h>
/* REMARK: all priorities are negated, since on the Amiga, lower
* priorities mean less power, not more power.. */
int
getpriority (int which, int who)
{
if (who < PRIO_PROCESS || who > PRIO_USER)
{
errno = EINVAL;
KPRINTF (("&errno = %lx, errno = %ld\n", &errno, errno));
return -1;
}
if (which == PRIO_USER || who == 0)
{
struct Task *myself = (struct Task *)FindTask (0);
/* in this case I ignore the 'which' argument, and just return
* my own Priority */
return - myself->tc_Node.ln_Pri;
}
/* so we look for processes. I ignore a difference between processes
* and process-groups.. */
/* try to validate, that the given pid is really a task-pointer */
/* a pointer has to be word-aligned */
if (!(who & 1))
{
struct Task *task = (struct Task *)who;
/* it must have a node-type of either NT_PROCESS or NT_TASK */
if (task->tc_Node.ln_Type == NT_PROCESS ||
task->tc_Node.ln_Type == NT_TASK)
/* so we have to believe, this is really a task */
return - task->tc_Node.ln_Pri;
}
errno = ESRCH;
KPRINTF (("&errno = %lx, errno = %ld\n", &errno, errno));
return -1;
}