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Man Pages
NICE(3) FreeBSD Library Functions Manual NICE(3)

nice
set program scheduling priority

Standard C Library (libc, -lc)

#include <unistd.h>

int
nice(int incr);

This interface is obsoleted by setpriority(2).

The nice() function adds incr to the scheduling priority of the process. 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 completion, nice() returns 0, and errno is unchanged. 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:
[]
The incr argument is negative and the caller does not have appropriate privileges.

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

The nice() function conforms to IEEE Std 1003.1-2008 (“POSIX.1”) except for the return value. This implementation returns 0 upon successful completion but the standard requires returning the new nice value, which could be -1.

A nice() syscall appeared in Version 6 AT&T UNIX.
February 28, 2015 FreeBSD 13.1-RELEASE

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