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7a12c6bb | 1 | /* getpriority for Linux. |
b5791037 UD |
2 | Copyright (C) 1996 Free Software Foundation, Inc. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | 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 | Library General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Library General Public | |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
7a12c6bb RM |
18 | |
19 | #include <errno.h> | |
20 | #include <sys/resource.h> | |
21 | ||
22 | extern int __syscall_getpriority (int, int); | |
23 | ||
24 | /* The return value of __syscall_getpriority is biased by this value | |
25 | to avoid returning negative values. */ | |
26 | #define PZERO 20 | |
27 | ||
28 | /* Return the highest priority of any process specified by WHICH and WHO | |
29 | (see above); if WHO is zero, the current process, process group, or user | |
30 | (as specified by WHO) is used. A lower priority number means higher | |
31 | priority. Priorities range from PRIO_MIN to PRIO_MAX. */ | |
32 | ||
33 | int | |
34 | getpriority (enum __priority_which which, int who) | |
35 | { | |
36 | int res; | |
37 | ||
38 | res = __syscall_getpriority ((int) which, who); | |
39 | if (res >= 0) | |
40 | res = PZERO - res; | |
41 | return res; | |
42 | } |