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-.\" Copyright (c) 1980, 1991 The Regents of the University of California.
-.\" All rights reserved.
-.\"
-.\" SPDX-License-Identifier: BSD-4-Clause-UC
-.\"
-.\"     @(#)getpriority.2	6.9 (Berkeley) 3/10/91
-.\"
-.\" Modified 1993-07-24 by Rik Faith <faith@cs.unc.edu>
-.\" Modified 1996-07-01 by Andries Brouwer <aeb@cwi.nl>
-.\" Modified 1996-11-06 by Eric S. Raymond <esr@thyrsus.com>
-.\" Modified 2001-10-21 by Michael Kerrisk <mtk.manpages@gmail.com>
-.\"    Corrected statement under EPERM to clarify privileges required
-.\" Modified 2002-06-21 by Michael Kerrisk <mtk.manpages@gmail.com>
-.\"    Clarified meaning of 0 value for 'who' argument
-.\" Modified 2004-05-27 by Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.TH getpriority 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-getpriority, setpriority \- get/set program scheduling priority
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <sys/resource.h>
-.P
-.BI "int getpriority(int " which ", id_t " who );
-.BI "int setpriority(int " which ", id_t " who ", int " prio );
-.fi
-.SH DESCRIPTION
-The scheduling priority of the process, process group, or user, as
-indicated by
-.I which
-and
-.I who
-is obtained with the
-.BR getpriority ()
-call and set with the
-.BR setpriority ()
-call.
-The process attribute dealt with by these system calls is
-the same attribute (also known as the "nice" value) that is dealt with by
-.BR nice (2).
-.P
-The value
-.I which
-is one of
-.BR PRIO_PROCESS ,
-.BR PRIO_PGRP ,
-or
-.BR PRIO_USER ,
-and
-.I who
-is interpreted relative to
-.I which
-(a process identifier for
-.BR PRIO_PROCESS ,
-process group
-identifier for
-.BR PRIO_PGRP ,
-and a user ID for
-.BR PRIO_USER ).
-A zero value for
-.I who
-denotes (respectively) the calling process, the process group of the
-calling process, or the real user ID of the calling process.
-.P
-The
-.I prio
-argument is a value in the range \-20 to 19 (but see NOTES below),
-with \-20 being the highest priority and 19 being the lowest priority.
-Attempts to set a priority outside this range
-are silently clamped to the range.
-The default priority is 0;
-lower values give a process a higher scheduling priority.
-.P
-The
-.BR getpriority ()
-call returns the highest priority (lowest numerical value)
-enjoyed by any of the specified processes.
-The
-.BR setpriority ()
-call sets the priorities of all of the specified processes
-to the specified value.
-.P
-Traditionally, only a privileged process could lower the nice value
-(i.e., set a higher priority).
-However, since Linux 2.6.12, an unprivileged process can decrease
-the nice value of a target process that has a suitable
-.B RLIMIT_NICE
-soft limit; see
-.BR getrlimit (2)
-for details.
-.SH RETURN VALUE
-On success,
-.BR getpriority ()
-returns the calling thread's nice value, which may be a negative number.
-On error, it returns \-1 and sets
-.I errno
-to indicate the error.
-.P
-Since a successful call to
-.BR getpriority ()
-can legitimately return the value \-1, it is necessary
-to clear
-.I errno
-prior to the
-call, then check
-.I errno
-afterward to determine
-if \-1 is an error or a legitimate value.
-.P
-.BR setpriority ()
-returns 0 on success.
-On failure, it returns \-1 and sets
-.I errno
-to indicate the error.
-.SH ERRORS
-.TP
-.B EACCES
-The caller attempted to set a lower nice value
-(i.e., a higher process priority), but did not
-have the required privilege (on Linux: did not have the
-.B CAP_SYS_NICE
-capability).
-.TP
-.B EINVAL
-.I which
-was not one of
-.BR PRIO_PROCESS ,
-.BR PRIO_PGRP ,
-or
-.BR PRIO_USER .
-.TP
-.B EPERM
-A process was located, but its effective user ID did not match
-either the effective or the real user ID of the caller,
-and was not privileged (on Linux: did not have the
-.B CAP_SYS_NICE
-capability).
-But see NOTES below.
-.TP
-.B ESRCH
-No process was located using the
-.I which
-and
-.I who
-values specified.
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001,
-SVr4, 4.4BSD (these interfaces first appeared in 4.2BSD).
-.SH NOTES
-For further details on the nice value, see
-.BR sched (7).
-.P
-.IR Note :
-the addition of the "autogroup" feature in Linux 2.6.38 means that
-the nice value no longer has its traditional effect in many circumstances.
-For details, see
-.BR sched (7).
-.P
-A child created by
-.BR fork (2)
-inherits its parent's nice value.
-The nice value is preserved across
-.BR execve (2).
-.P
-The details on the condition for
-.B EPERM
-depend on the system.
-The above description is what POSIX.1-2001 says, and seems to be followed on
-all System\ V-like systems.
-Linux kernels before Linux 2.6.12 required the real or
-effective user ID of the caller to match
-the real user of the process \fIwho\fP (instead of its effective user ID).
-Linux 2.6.12 and later require
-the effective user ID of the caller to match
-the real or effective user ID of the process \fIwho\fP.
-All BSD-like systems (SunOS 4.1.3, Ultrix 4.2,
-4.3BSD, FreeBSD 4.3, OpenBSD-2.5, ...) behave in the same
-manner as Linux 2.6.12 and later.
-.\"
-.SS C library/kernel differences
-The getpriority system call returns nice values translated to the range 40..1,
-since a negative return value would be interpreted as an error.
-The glibc wrapper function for
-.BR getpriority ()
-translates the value back according to the formula
-.I unice\~=\~20\~\-\~knice
-(thus, the 40..1 range returned by the kernel
-corresponds to the range \-20..19 as seen by user space).
-.SH BUGS
-According to POSIX, the nice value is a per-process setting.
-However, under the current Linux/NPTL implementation of POSIX threads,
-the nice value is a per-thread attribute:
-different threads in the same process can have different nice values.
-Portable applications should avoid relying on the Linux behavior,
-which may be made standards conformant in the future.
-.SH SEE ALSO
-.BR nice (1),
-.BR renice (1),
-.BR fork (2),
-.BR capabilities (7),
-.BR sched (7)
-.P
-.I Documentation/scheduler/sched\-nice\-design.txt
-in the Linux kernel source tree (since Linux 2.6.23)