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-.\" Copyright (C) Tom Bjorkholm & Markus Kuhn, 1996
-.\"
-.\" SPDX-License-Identifier: GPL-2.0-or-later
-.\"
-.\" 1996-04-01 Tom Bjorkholm <tomb@mydata.se>
-.\" First version written
-.\" 1996-04-10 Markus Kuhn <mskuhn@cip.informatik.uni-erlangen.de>
-.\" revision
-.\" Modified 2004-05-27 by Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.TH sched_setparam 2 (date) "Linux man-pages (unreleased)"
-.SH NAME
-sched_setparam, sched_getparam \- set and get scheduling parameters
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <sched.h>
-.PP
-.BI "int sched_setparam(pid_t " pid ", const struct sched_param *" param );
-.BI "int sched_getparam(pid_t " pid ", struct sched_param *" param );
-.PP
-\fBstruct sched_param {
- ...
- int \fIsched_priority\fB;
- ...
-};
-.fi
-.SH DESCRIPTION
-.BR sched_setparam ()
-sets the scheduling parameters associated with the scheduling policy
-for the thread whose thread ID is specified in \fIpid\fP.
-If \fIpid\fP is zero, then
-the parameters of the calling thread are set.
-The interpretation of
-the argument \fIparam\fP depends on the scheduling
-policy of the thread identified by
-.IR pid .
-See
-.BR sched (7)
-for a description of the scheduling policies supported under Linux.
-.PP
-.BR sched_getparam ()
-retrieves the scheduling parameters for the
-thread identified by \fIpid\fP.
-If \fIpid\fP is zero, then the parameters
-of the calling thread are retrieved.
-.PP
-.BR sched_setparam ()
-checks the validity of \fIparam\fP for the scheduling policy of the
-thread.
-The value \fIparam\->sched_priority\fP must lie within the
-range given by
-.BR sched_get_priority_min (2)
-and
-.BR sched_get_priority_max (2).
-.PP
-For a discussion of the privileges and resource limits related to
-scheduling priority and policy, see
-.BR sched (7).
-.PP
-POSIX systems on which
-.BR sched_setparam ()
-and
-.BR sched_getparam ()
-are available define
-.B _POSIX_PRIORITY_SCHEDULING
-in \fI<unistd.h>\fP.
-.SH RETURN VALUE
-On success,
-.BR sched_setparam ()
-and
-.BR sched_getparam ()
-return 0.
-On error, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EINVAL
-Invalid arguments:
-.I param
-is NULL or
-.I pid
-is negative
-.TP
-.B EINVAL
-.RB ( sched_setparam ())
-The argument \fIparam\fP does not make sense for the current
-scheduling policy.
-.TP
-.B EPERM
-.RB ( sched_setparam ())
-The caller does not have appropriate privileges
-(Linux: does not have the
-.B CAP_SYS_NICE
-capability).
-.TP
-.B ESRCH
-The thread whose ID is \fIpid\fP could not be found.
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001.
-.SH SEE ALSO
-.ad l
-.nh
-.BR getpriority (2),
-.BR gettid (2),
-.BR nice (2),
-.BR sched_get_priority_max (2),
-.BR sched_get_priority_min (2),
-.BR sched_getaffinity (2),
-.BR sched_getscheduler (2),
-.BR sched_setaffinity (2),
-.BR sched_setattr (2),
-.BR sched_setscheduler (2),
-.BR setpriority (2),
-.BR capabilities (7),
-.BR sched (7)