2.9BSD/usr/man/man2/nice.2

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.TH NICE 2 
.UC
.UC
.SH NAME
nice \- change program priority
.SH SYNOPSIS
.B nice(incr)
.SH DESCRIPTION
The scheduling
priority of the process is augmented by
.IR incr .
Positive priorities get less
service than normal.
Priority 10 is recommended to users
who wish to execute long-running programs
without flak from the administration.
.PP
Negative increments are ignored except on behalf of 
the super-user.
The priority is limited to the range
\-20 (most urgent) to 20 (least).
.PP
The priority of a process is
passed to a child process by
.IR fork (2).
For a privileged process to return to normal priority
from an unknown state,
.I nice
should be called successively with arguments
\-40 (goes to priority \-20 because of truncation),
20 (to get to 0),
then 0 (to maintain compatibility with previous versions
of this call).
.SH ERRORS
.I Nice
will fail and the process's scheduling priority remain the same if:
.TP 20
[EPERM]
.I Incr
is negative and the process's effective user ID is not the super-user.
.SH "SEE ALSO"
nice(1), renice(1), renice(2)
.SH ASSEMBLER
(nice = 34.)
.br
(priority in r0)
.br
.B sys nice