usr/src/lib/libbc/libc/compat/4.1/nice.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1986 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28           /* from UCB 4.1 83/05/30 */
  29
  30 #include <sys/time.h>
  31 #include <sys/resource.h>
  32
  33 /*
  34  * Backwards compatible nice.
  35  */
  36 int
  37 nice(incr)
  38         int incr;
  39 {
  40         int prio;
  41         extern int errno;
  42         int serrno;
  43
  44         serrno = errno;
  45         errno = 0;
  46         prio = getpriority(PRIO_PROCESS, 0);
  47         if (prio == -1 && errno)
  48                 return (-1);
  49         if (setpriority(PRIO_PROCESS, 0, prio + incr) == -1)
  50                 return (-1);
  51         errno = serrno;
  52         return (0);
  53 }