NICE

nice ? change process priority

#include <unistd.h>

int nice(int inc);

nice adds inc to the priority for the calling pid. Only the superuser may specify a negative increment, or priority increase.

Note that internally, a higher number is a higher priority. Do not confuse this with the priority scheme as used by the nice interface.

On success, zero is returned. On error, ?1 is returned, and errno is set appropriately.

EPERM

A non-super user attempts to do a priority increase, a numerical decrease, by supplying a negative inc.

SVr4, SVID EXT, AT&T, X/OPEN, BSD 4.3. SVr4 documents an additional EINVAL error code.

nice(1), setpriority(2), fork(2), renice(8)