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1 | /* getpriority for Linux. | |
2 | Copyright (C) 1996-2019 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <errno.h> | |
20 | #include <sys/resource.h> | |
21 | ||
22 | #include <sysdep.h> | |
23 | #include <sys/syscall.h> | |
24 | ||
25 | /* The return value of getpriority syscall is biased by this value | |
26 | to avoid returning negative values. */ | |
27 | #define PZERO 20 | |
28 | ||
29 | /* Return the highest priority of any process specified by WHICH and WHO | |
30 | (see above); if WHO is zero, the current process, process group, or user | |
31 | (as specified by WHO) is used. A lower priority number means higher | |
32 | priority. Priorities range from PRIO_MIN to PRIO_MAX. */ | |
33 | ||
34 | int | |
35 | __getpriority (enum __priority_which which, id_t who) | |
36 | { | |
37 | int res; | |
38 | ||
39 | res = INLINE_SYSCALL (getpriority, 2, (int) which, who); | |
40 | if (res >= 0) | |
41 | res = PZERO - res; | |
42 | return res; | |
43 | } | |
44 | libc_hidden_def (__getpriority) | |
45 | weak_alias (__getpriority, getpriority) |