nice man page on Ultrix

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nice(3)								       nice(3)

Name
       nice - set program priority

Syntax
       int nice(incr)
       int incr;

Description
       The  scheduling priority of the process is augmented by incr.  Positive
       priorities get less service than normal.	 Priority 10 is recommended to
       users  who wish to execute long-running programs without flack from the
       administration.

       Negative increments are ignored except on  behalf  of  the  super-user.
       The priority is limited to the range -20 (most urgent) to 20 (least).

       The  priority of a process is passed to a child process by For a privi‐
       leged process to return to  normal  priority  from  an  unknown	state,
       should  be called successively with arguments -40 (goes to priority -20
       because of truncation), 20 (to get to 0), then 0 (to maintain  compati‐
       bility with previous versions of this call).

Environment
       In  any	mode,  nice  returns -1 and sets on an error.  On success, the
       return value depends on the mode in which your  program	was  compiled.
       In  POSIX  or  System  V mode, it is the new priority; otherwise, it is
       zero.  Note that, in POSIX and System V mode, -1	 can  indicate	either
       success or failure; must be used to determine which.

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

								       nice(3)
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