DragonFly On-Line Manual Pages
NICE(3) DragonFly Library Functions Manual NICE(3)
nice -- set program scheduling priority
Standard C Library (libc, -lc)
This interface is obsoleted by setpriority(2).
The nice() function obtains the scheduling priority of the process from
the system and sets it to the priority value specified in incr. The pri-
ority is a value in the range -20 to 20. The default priority is 0;
lower priorities cause more favorable scheduling. Only the super-user
may lower priorities.
Children inherit the priority of their parent processes via fork(2).
Upon successful completion, nice() returns the new nice value. Other-
wise, -1 is returned, the process' nice value is not changed, and errno
is set appropriately.
The nice() function will fail if:
[EPERM] The incr argument is negative and the calling process
does not have super-user privileges.
nice(1), fork(2), setpriority(2), renice(8)
A nice() syscall appeared in Version 6 AT&T UNIX.
DragonFly 4.7 June 25, 2009 DragonFly 4.7