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-.\" Copyright (c) 1980, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
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-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)getpriority.2	8.1 (Berkeley) 6/4/93
-.\"
-.Dd June 4, 1993
-.Dt GETPRIORITY 2
-.Os
-.Sh NAME
-.Nm getpriority ,
-.Nm setpriority
-.Nd get/set program scheduling priority
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In sys/time.h
-.In sys/resource.h
-.Ft int
-.Fn getpriority "int which" "int who"
-.Ft int
-.Fn setpriority "int which" "int who" "int prio"
-.Sh DESCRIPTION
-The scheduling
-priority of the process, process group, or user, as indicated by
-.Fa which
-and
-.Fa who
-is obtained with the
-.Fn getpriority
-system call and set with the
-.Fn setpriority
-system call.
-The
-.Fa which
-argument
-is one of
-.Dv PRIO_PROCESS ,
-.Dv PRIO_PGRP ,
-or
-.Dv PRIO_USER ,
-and
-.Fa who
-is interpreted relative to
-.Fa which
-(a process identifier for
-.Dv PRIO_PROCESS ,
-process group
-identifier for
-.Dv PRIO_PGRP ,
-and a user ID for
-.Dv PRIO_USER ) .
-A zero value of
-.Fa who
-denotes the current process, process group, or user.
-The
-.Fa prio
-argument
-is a value in the range -20 to 20.
-The default priority is 0;
-lower priorities cause more favorable scheduling.
-.Pp
-The
-.Fn getpriority
-system call returns the highest priority (lowest numerical value)
-enjoyed by any of the specified processes.
-The
-.Fn setpriority
-system call sets the priorities of all of the specified processes
-to the specified value.
-Only the super-user may lower priorities.
-.Sh RETURN VALUES
-Since
-.Fn getpriority
-can legitimately return the value -1, it is necessary
-to clear the external variable
-.Va errno
-prior to the
-call, then check it afterward to determine
-if a -1 is an error or a legitimate value.
-.Pp
-.Rv -std setpriority
-.Sh ERRORS
-The
-.Fn getpriority
-and
-.Fn setpriority
-system calls
-will fail if:
-.Bl -tag -width Er
-.It Bq Er ESRCH
-No process was located using the
-.Fa which
-and
-.Fa who
-values specified.
-.It Bq Er EINVAL
-The
-.Fa which
-argument
-was not one of
-.Dv PRIO_PROCESS ,
-.Dv PRIO_PGRP ,
-or
-.Dv PRIO_USER .
-.El
-.Pp
-In addition to the errors indicated above,
-.Fn setpriority
-will fail if:
-.Bl -tag -width Er
-.It Bq Er EPERM
-A process was located, but neither its effective nor real user
-ID matched the effective user ID of the caller.
-.It Bq Er EACCES
-A non super-user attempted to lower a process priority.
-.El
-.Sh SEE ALSO
-.Xr nice 1 ,
-.Xr fork 2 ,
-.Xr renice 8
-.Sh HISTORY
-The
-.Fn getpriority
-system call appeared in
-.Bx 4.2 .