nice/nice.c

   1 /*      $NetBSD: nice.c,v 1.10 1997/10/19 06:28:04 lukem Exp $  */
   2
   3 /*
   4  * Copyright (c) 1989 The Regents of the University of California.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 #ifndef lint
  38 __COPYRIGHT(
  39     "@(#) Copyright (c) 1989 The Regents of the University of California.\n\
  40  All rights reserved.\n");
  41 #endif /* not lint */
  42
  43 #ifndef lint
  44 #if 0
  45 static char sccsid[] = "@(#)nice.c      5.4 (Berkeley) 6/1/90";
  46 #endif
  47 __RCSID("$NetBSD: nice.c,v 1.10 1997/10/19 06:28:04 lukem Exp $");
  48 #endif /* not lint */
  49
  50 #include <sys/types.h>
  51 #include <sys/time.h>
  52 #include <sys/resource.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #include <locale.h>
  57 #include <ctype.h>
  58 #include <errno.h>
  59 #include <err.h>
  60 #include <unistd.h>
  61
  62 #define DEFNICE 10
  63
  64 int     main __P((int, char **));
  65 static void usage __P((void));
  66
  67 int
  68 main(argc, argv)
  69         int argc;
  70         char **argv;
  71 {
  72         int niceness = DEFNICE;
  73         int c;
  74
  75         setlocale(LC_ALL, "");
  76
  77         /* handle obsolete -number syntax */
  78         if (argc > 1 && argv[1][0] == '-' && isdigit(argv[1][1])) {
  79                 niceness = atoi (argv[1] + 1);
  80                 argc--; argv++;
  81         }
  82
  83         while ((c = getopt (argc, argv, "n:")) != -1) {
  84                 switch (c) {
  85                 case 'n':
  86                         niceness = atoi (optarg);
  87                         break;
  88
  89                 case '?':
  90                 default:
  91                         usage();
  92                         break;
  93                 }
  94         }
  95         argc -= optind; argv += optind;
  96
  97         if (argc == 0)
  98                 usage();
  99
 100         errno = 0;
 101         niceness += getpriority(PRIO_PROCESS, 0);
 102         if (errno) {
 103                 err (1, "getpriority");
 104                 /* NOTREACHED */
 105         }
 106         if (setpriority(PRIO_PROCESS, 0, niceness)) {
 107                 warn ("setpriority");
 108         }
 109
 110         execvp(argv[0], &argv[0]);
 111         err ((errno == ENOENT) ? 127 : 126, "%s", argv[0]);
 112         /* NOTREACHED */
 113 }
 114
 115 static void
 116 usage()
 117 {
 118         (void)fprintf(stderr,
 119             "usage: nice [ -n increment ] utility [ argument ...]\n");
 120
 121         exit(1);
 122 }