NICE(2) NICE(2)
NAME
nice - change priority of a process
SYNOPSIS
int nice (incr)
int incr;
DESCRIPTION
nice adds the value of incr to the nice value of the calling
process. A process's nice value is a non-negative number
for which a more positive value results in lower CPU
priority.
A maximum nice value of 39 and a minimum nice value of 0 are
imposed by the system. (The default nice value is 20.)
Requests for values above or below these limits result in
the nice value being set to the corresponding limit.
[EPERM] nice will fail and not change the nice value
if incr is negative or greater than 39 and
the effective user ID of the calling process
is not super-user.
SEE ALSO
exec(2).
nice(1) in the User's Reference Manual.
DIAGNOSTICS
Upon successful completion, nice returns the new nice value
minus 20. Otherwise, a value of -1 is returned and errno is
set to indicate the error.
Page 1 May 1989