libc/gen/nice.c

1.5.4.1      jtc /*	$NetBSD: nice.c,v 1.5.4.1 1996/09/19 20:03:21 jtc Exp $	*/
    1.5      cgd
    1.1      cgd /*
    1.5      cgd  * Copyright (c) 1983, 1993
    1.5      cgd  *	The Regents of the University of California.  All rights reserved.
    1.1      cgd  *
    1.1      cgd  * Redistribution and use in source and binary forms, with or without
    1.1      cgd  * modification, are permitted provided that the following conditions
    1.1      cgd  * are met:
    1.1      cgd  * 1. Redistributions of source code must retain the above copyright
    1.1      cgd  *    notice, this list of conditions and the following disclaimer.
    1.1      cgd  * 2. Redistributions in binary form must reproduce the above copyright
    1.1      cgd  *    notice, this list of conditions and the following disclaimer in the
    1.1      cgd  *    documentation and/or other materials provided with the distribution.
    1.1      cgd  * 3. All advertising materials mentioning features or use of this software
    1.1      cgd  *    must display the following acknowledgement:
    1.1      cgd  *	This product includes software developed by the University of
    1.1      cgd  *	California, Berkeley and its contributors.
    1.1      cgd  * 4. Neither the name of the University nor the names of its contributors
    1.1      cgd  *    may be used to endorse or promote products derived from this software
    1.1      cgd  *    without specific prior written permission.
    1.1      cgd  *
    1.1      cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
    1.1      cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    1.1      cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    1.1      cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
    1.1      cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    1.1      cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
    1.1      cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    1.1      cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    1.1      cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    1.1      cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    1.1      cgd  * SUCH DAMAGE.
    1.1      cgd  */
    1.1      cgd
    1.1      cgd #if defined(LIBC_SCCS) && !defined(lint)
    1.5      cgd #if 0
    1.5      cgd static char sccsid[] = "@(#)nice.c	8.1 (Berkeley) 6/4/93";
    1.5      cgd #else
1.5.4.1      jtc static char rcsid[] = "$NetBSD: nice.c,v 1.5.4.1 1996/09/19 20:03:21 jtc Exp $";
    1.5      cgd #endif
    1.1      cgd #endif /* LIBC_SCCS and not lint */
    1.1      cgd
1.5.4.1      jtc #include "namespace.h"
    1.4  mycroft #include <sys/types.h>
    1.1      cgd #include <sys/time.h>
    1.1      cgd #include <sys/resource.h>
    1.1      cgd #include <unistd.h>
1.5.4.1      jtc
1.5.4.1      jtc #ifdef __weak_alias
1.5.4.1      jtc __weak_alias(nice,_nice);
1.5.4.1      jtc #endif
    1.1      cgd
    1.1      cgd /*
    1.1      cgd  * Backwards compatible nice.
    1.1      cgd  */
    1.1      cgd int
    1.1      cgd nice(incr)
    1.1      cgd 	int incr;
    1.1      cgd {
    1.1      cgd 	int prio;
    1.1      cgd 	extern int errno;
    1.1      cgd
    1.1      cgd 	errno = 0;
    1.1      cgd 	prio = getpriority(PRIO_PROCESS, 0);
    1.1      cgd 	if (prio == -1 && errno)
    1.1      cgd 		return (-1);
    1.1      cgd 	return (setpriority(PRIO_PROCESS, 0, prio + incr));
    1.1      cgd }