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 priority
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 completition, nice() returns the new nice value minus
NZERO. Otherwise, -1 is returned, the process' nice value is not
changed, and errno is set to indicate the error.
The nice() function will fail if:
[EPERM] The incr argument is negative and the caller is not
nice(1), fork(2), setpriority(2), renice(8)
The nice() function conforms to X/Open Portability Guide Issue 4.2
A nice() syscall appeared in Version 6 AT&T UNIX.
BSD February 16, 1998 BSD
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