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NICE(3) BSD 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 priority is a value in the range -20 to 20.
The default priority is 0; lower priorities cause more favorable scheduling. Only a process
with appropriate privileges may lower priorities.
Children inherit the priority of their parent processes via fork(2).
Upon successful completion, 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 does not have appropriate
nice(1), fork(2), setpriority(2), renice(8)
The nice() function conforms to X/Open Portability Guide Issue 4, Version 2 (``XPG4.2'').
A nice() syscall appeared in Version 6 AT&T UNIX.
BSD April 30, 2011 BSD
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