#ifndef lintstatic	char	*sccsid = "@(#)nice.c	4.1	(ULTRIX)	7/3/90";#endif lint/************************************************************************ *									* *			Copyright (c) 1985 by				* *		Digital Equipment Corporation, Maynard, MA		* *			All rights reserved.				* *									* *   This software is furnished under a license and may be used and	* *   copied  only  in accordance with the terms of such license and	* *   with the  inclusion  of  the  above  copyright  notice.   This	* *   software  or  any  other copies thereof may not be provided or	* *   otherwise made available to any other person.  No title to and	* *   ownership of the software is hereby transferred.			* *									* *   This software is  derived  from  software  received  from  the	* *   University    of   California,   Berkeley,   and   from   Bell	* *   Laboratories.  Use, duplication, or disclosure is  subject  to	* *   restrictions  under  license  agreements  with  University  of	* *   California and with AT&T.						* *									* *   The information in this software is subject to change  without	* *   notice  and should not be construed as a commitment by Digital	* *   Equipment Corporation.						* *									* *   Digital assumes no responsibility for the use  or  reliability	* *   of its software on equipment which is not supplied by Digital.	* *									* ************************************************************************//************************************************************************ *			Modification History				* *									* *	G Gopal, 28-Sep-1989 * 0002 In posix mode return the new nice value. * *	David L Ballenger, 30-Mar-1985					* * 0001	Add defintions for System V compatibility.			* *									* ************************************************************************//*	nice.c	4.1	83/05/30	*/#include <sys/exec.h>#include <sys/sysinfo.h>#include <signal.h>#include <sys/time.h>#include <sys/resource.h>/* * Backwards compatible nice. */nice(incr)	int incr;{	int prio, retval;	short progenv;	extern int errno;	errno = 0;	prio = getpriority(PRIO_PROCESS, 0);	if (prio == -1 && errno)		return (-1);	prio += incr ; /* Assumed new priority */	if( getsysinfo(GSI_PROG_ENV, &progenv, sizeof(int), 0, 0, 0) < 1 )		progenv = A_BSD;#ifndef SYSTEM_FIVE	/*	 * On ULTRIX just return value from setpriority	 */ 	retval = setpriority(PRIO_PROCESS, 0, prio);	if((progenv == A_POSIX) && (retval == 0)) /* success */		return(getpriority(PRIO_PROCESS,0));		return (retval);#else   SYSTEM_FIVE	/*	 * For System V  make sure the assumed priority is in the	 * correct range, and return it if set priority succeeds	 */	if (prio < -20)		prio = -20;	else if (prio > 19)		prio = 19;	return(setpriority(PRIO_PROCESS, 0, prio) == 0 ? prio : -1);#endif SYSTEM_FIVE}