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glibc  2.9
getpriority.c
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00001 /* Copyright (C) 1994,96,97,2000,02, 2004 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <sys/resource.h>
00021 #include <sys/sysmp.h>
00022 
00023 extern int __sysmp (int, ...);
00024 
00025 /* Return the highest priority of any process specified by WHICH and WHO
00026    (see <sys/resource.h>); if WHO is zero, the current process, process group,
00027    or user (as specified by WHO) is used.  A lower priority number means higher
00028    priority.  Priorities range from PRIO_MIN to PRIO_MAX.  */
00029 int
00030 getpriority (which, who)
00031      enum __priority_which which;
00032      id_t who;
00033 {
00034   switch (which)
00035     {
00036     case PRIO_PROCESS:
00037       return __sysmp (MP_SCHED, MPTS_GTNICE_PROC, who);
00038     case PRIO_PGRP:
00039       return __sysmp (MP_SCHED, MPTS_GTNICE_PGRP, who);
00040     case PRIO_USER:
00041       return __sysmp (MP_SCHED, MPTS_GTNICE_USER, who);
00042     }
00043 
00044   __set_errno (EINVAL);
00045   return -1;
00046 }
00047 libc_hidden_def (getpriority)