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From: wescott@Columbia.NCR.COM (Mike Wescott)
Newsgroups: comp.unix.programmer
Subject: Re: Nice() in Sys V.4
Keywords: nice(), priocntl(), ioctl()
Message-ID: <1991Mar21.141753.28726@nncrcae.Columbia.NCR.COM>
Date: 21 Mar 91 19:17:52 GMT
References: <previous> <posting> <318@secola.Columbia.NCR.COM>
Organization: NCR Corp
Lines: 35
Nntp-Posting-Host: micky

In article <318@secola.Columbia.NCR.COM> krupczak@secola.Columbia.NCR.COM (Bobby Krupczak) writes:
> In V.4, there is a /proc file system.
[...]
> I found
> a ioctl() option that will allow one to set the nice value of a process.
> Unforntunately, the header files do not tell what the arguments are.

See proc(4) in the FM:

	Information and  control  operations  are  provided  through
	ioctl.  These have the form:

		#include <sys/types.h>
		#include <sys/signal.h>
		#include <sys/fault.h>
		#include <sys/syscall.h>
		#include <sys/procfs.h>
		void *p;
		retval = ioctl(fildes, code, p);

	The argument p is a generic pointer whose  type  depends  on
	the  specific  ioctl code.  Where not specifically mentioned
	below, its value should be  zero.   <sys/procfs.h>  contains

	[...]

    PIOCNICE*
	The traced process's nice priority  is  incremented  by  the
	amount  contained  in  the  int  addressed  by  p.  Only the
	super-user may better a process's priority in this way,  but
	any user may make the priority worse.

--
	-Mike Wescott
	 mike.wescott@ncrcae.Columbia.NCR.COM