sysdeps/unix/sysv/irix4/getpriority.c

   1 /* Copyright (C) 1994,96,97,2000,02, 2004 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <sys/resource.h>
  21 #include <sys/sysmp.h>
  22
  23 extern int __sysmp (int, ...);
  24
  25 /* Return the highest priority of any process specified by WHICH and WHO
  26    (see <sys/resource.h>); if WHO is zero, the current process, process group,
  27    or user (as specified by WHO) is used.  A lower priority number means higher
  28    priority.  Priorities range from PRIO_MIN to PRIO_MAX.  */
  29 int
  30 getpriority (which, who)
  31      enum __priority_which which;
  32      id_t who;
  33 {
  34   switch (which)
  35     {
  36     case PRIO_PROCESS:
  37       return __sysmp (MP_SCHED, MPTS_GTNICE_PROC, who);
  38     case PRIO_PGRP:
  39       return __sysmp (MP_SCHED, MPTS_GTNICE_PGRP, who);
  40     case PRIO_USER:
  41       return __sysmp (MP_SCHED, MPTS_GTNICE_USER, who);
  42     }
  43
  44   __set_errno (EINVAL);
  45   return -1;
  46 }
  47 libc_hidden_def (getpriority)