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nice.c revision 1.7 
      1 /*
      2  * Copyright (c) 1989 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 char copyright[] =
     36 "@(#) Copyright (c) 1989 The Regents of the University of California.\n\
     37  All rights reserved.\n";
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 /*static char sccsid[] = "from: @(#)nice.c	5.4 (Berkeley) 6/1/90";*/
     42 static char rcsid[] = "$Id: nice.c,v 1.7 1993/11/19 20:07:13 jtc Exp $";
     43 #endif /* not lint */
     44 
     45 #include <sys/time.h>
     46 #include <sys/resource.h>
     47 #include <stdio.h>
     48 #include <stdlib.h>
     49 #include <string.h>
     50 #include <locale.h>
     51 #include <ctype.h>
     52 #include <errno.h>
     53 #include <err.h>
     54 #include <unistd.h>
     55 
     56 #define	DEFNICE	10
     57 
     58 static void usage();
     59 
     60 int
     61 main(argc, argv)
     62 	int argc;
     63 	char **argv;
     64 {
     65 	int niceness = DEFNICE;
     66 	int c;
     67 
     68 	setlocale(LC_ALL, "");
     69 
     70         /* handle obsolete -number syntax */
     71         if (argc > 1 && argv[1][0] == '-' && isdigit(argv[1][1])) {
     72 		niceness = atoi (argv[1] + 1);
     73                 argc--; argv++;
     74         }
     75 
     76 	while ((c = getopt (argc, argv, "n:")) != -1) {
     77 		switch (c) {
     78 		case 'n':
     79 			niceness = atoi (optarg);
     80 			break;
     81 
     82 		case '?':
     83 		default:
     84 			usage();
     85 			break;
     86 		}
     87 	}
     88 	argc -= optind; argv += optind;
     89 
     90 	if (argc == 0)
     91 		usage();
     92 
     93 	errno = 0;
     94 	niceness += getpriority(PRIO_PROCESS, 0);
     95 	if (errno) {
     96 		err (1, "getpriority");
     97 		/* NOTREACHED */
     98 	}
     99 	if (setpriority(PRIO_PROCESS, 0, niceness)) {
    100 		warn ("setpriority");
    101 	}
    102 
    103 	execvp(argv[0], &argv[0]);
    104 	err ((errno == ENOENT) ? 127 : 126, "%s", argv[0]);
    105 	/* NOTREACHED */
    106 }
    107 
    108 static void
    109 usage()
    110 {
    111 	(void)fprintf(stderr,
    112 	    "usage: nice [ -n increment ] utility [ argument ...]\n");
    113 
    114 	exit(1);
    115 }
    116