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nice.c revision 1.10 
      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 }
    123