?? nice.c
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#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}
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