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nice.c revision 1.2 
      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[] = "@(#)nice.c	5.4 (Berkeley) 6/1/90";
     42 #endif /* not lint */
     43 
     44 #include <sys/time.h>
     45 #include <sys/resource.h>
     46 #include <stdio.h>
     47 #include <ctype.h>
     48 #include <string.h>
     49 
     50 #define	DEFNICE	10
     51 
     52 /* ARGSUSED */
     53 main(argc, argv)
     54 	int argc;
     55 	char **argv;
     56 {
     57 	extern int errno;
     58 	int niceness;
     59 
     60 	if (!argv[1])
     61 		usage();
     62 
     63 	niceness = DEFNICE;
     64 	if (argv[1][0] == '-')
     65 		if (isdigit(argv[1][1]) || argv[1][1] == '-') {
     66 			niceness = atoi(argv[1] + 1);
     67 			++argv;
     68 		}
     69 		else {
     70 			(void)fprintf(stderr, "nice: illegal option -- %c\n",
     71 			    argv[1][1]);
     72 			usage();
     73 		}
     74 
     75 	if (!argv[1])
     76 		usage();
     77 
     78 	errno = 0;
     79 	niceness += getpriority(PRIO_PROCESS, 0);
     80 	if (errno) {
     81 		(void)fprintf(stderr, "nice: getpriority: %s\n",
     82 		    strerror(errno));
     83 		exit(1);
     84 	}
     85 	if (setpriority(PRIO_PROCESS, 0, niceness)) {
     86 		(void)fprintf(stderr, "nice: setpriority: %s\n",
     87 		    strerror(errno));
     88 		exit(1);
     89 	}
     90 	execvp(argv[1], &argv[1]);
     91 	(void)fprintf(stderr,
     92 	    "nice: %s: %s\n", argv[1], strerror(errno));
     93 	exit(1);
     94 }
     95 
     96 usage()
     97 {
     98 	(void)fprintf(stderr,
     99 	    "nice [ -# ] command [ options ] [ operands ]\n");
    100 	exit(1);
    101 }
    102