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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 2023-03-30 "Linux man-pages 6.04"
+.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)