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nice.c revision 1.5 
      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 1.5 1993/08/27 22:30:34 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 <ctype.h>
     51 #include <errno.h>
     52 #include <err.h>
     53 #include <unistd.h>
     54 
     55 #define	DEFNICE	10
     56 
     57 static void usage();
     58 
     59 int
     60 main(argc, argv)
     61 	int argc;
     62 	char **argv;
     63 {
     64 	int niceness = DEFNICE;
     65 	int c;
     66 
     67         /* handle obsolete -number syntax */
     68         if (argc > 1 && argv[1][0] == '-' && isdigit(argv[1][1])) {
     69 		niceness = atoi (argv[1] + 1);
     70                 argc--; argv++;
     71         }
     72 
     73 	while ((c = getopt (argc, argv, "n:")) != -1) {
     74 		switch (c) {
     75 		case 'n':
     76 			niceness = atoi (optarg);
     77 			break;
     78 
     79 		case '?':
     80 		default:
     81 			usage();
     82 			break;
     83 		}
     84 	}
     85 	argc -= optind; argv += optind;
     86 
     87 	if (argc == 0)
     88 		usage();
     89 
     90 	errno = 0;
     91 	niceness += getpriority(PRIO_PROCESS, 0);
     92 	if (errno) {
     93 		err (1, "getpriority");
     94 		/* NOTREACHED */
     95 	}
     96 	if (setpriority(PRIO_PROCESS, 0, niceness)) {
     97 		warn ("setpriority");
     98 	}
     99 	execvp(argv[0], &argv[0]);
    100 	err ((errno == ENOENT) ? 127 : 126, argv[0]);
    101 }
    102 
    103 static void
    104 usage()
    105 {
    106 	(void)fprintf(stderr,
    107 	    "usage: nice [ -n increment ] utility [ argument ...]\n");
    108 
    109 	exit(1);
    110 }
    111