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glibc/sysdeps/unix/sysv/linux/getpriority.c
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/* getpriority for Linux. | |
Copyright (C) 1996-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <sys/resource.h> | |
#include <sysdep.h> | |
#include <sys/syscall.h> | |
/* The return value of getpriority syscall is biased by this value | |
to avoid returning negative values. */ | |
#define PZERO 20 | |
/* Return the highest priority of any process specified by WHICH and WHO | |
(see above); if WHO is zero, the current process, process group, or user | |
(as specified by WHO) is used. A lower priority number means higher | |
priority. Priorities range from PRIO_MIN to PRIO_MAX. */ | |
int | |
__getpriority (enum __priority_which which, id_t who) | |
{ | |
int res; | |
res = INLINE_SYSCALL (getpriority, 2, (int) which, who); | |
if (res >= 0) | |
res = PZERO - res; | |
return res; | |
} | |
libc_hidden_def (__getpriority) | |
weak_alias (__getpriority, getpriority) |