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82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
/*
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* This file is part of ixemul.library for the Amiga.
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* Copyright (C) 1991, 1992 Markus M. Wild
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* setpriority.c,v 1.1.1.1 1994/04/04 04:30:34 amiga Exp
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*
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* setpriority.c,v
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* Revision 1.1.1.1 1994/04/04 04:30:34 amiga
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* Initial CVS check in.
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*
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* Revision 1.1 1992/05/14 19:55:40 mwild
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* Initial revision
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*
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*/
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#define _KERNEL
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#include "ixemul.h"
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#include "kprintf.h"
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/* REMARK: all priorities are negated, since on the Amiga, lower
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* priorities mean less power, not more power.. */
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int
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setpriority(int which, int who, int prio)
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{
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usetup;
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if (prio < PRIO_MIN) prio = PRIO_MIN;
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else if (prio > PRIO_MAX) prio = PRIO_MAX;
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if (which < PRIO_PROCESS || which > PRIO_USER)
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{
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errno = EINVAL;
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KPRINTF (("&errno = %lx, errno = %ld\n", &errno, errno));
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return -1;
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}
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if (which == PRIO_USER || who == 0)
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{
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struct Task *myself = (struct Task *)SysBase->ThisTask;
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/* in this case I ignore the 'which' argument, and just set
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* my own Priority */
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SetTaskPri(myself, -prio);
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return 0;
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}
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/* so we look for processes. I ignore a difference between processes
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* and process-groups.. */
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/* try to validate, that the given pid is really a task-pointer */
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/* a pointer has to be word-aligned */
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if (!(who & 1))
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{
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struct Task *task = (struct Task *)who;
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/* it must have a node-type of either NT_PROCESS or NT_TASK */
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if (task->tc_Node.ln_Type == NT_PROCESS ||
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task->tc_Node.ln_Type == NT_TASK)
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{
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/* so we have to believe, this is really a task */
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SetTaskPri(task, -prio);
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return 0;
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}
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}
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errno = ESRCH;
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KPRINTF (("&errno = %lx, errno = %ld\n", &errno, errno));
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return -1;
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}
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