Home | History | Annotate | Line # | Download | only in nice
nice.c revision 1.2
      1  1.1  cgd /*
      2  1.1  cgd  * Copyright (c) 1989 The Regents of the University of California.
      3  1.1  cgd  * All rights reserved.
      4  1.1  cgd  *
      5  1.1  cgd  * Redistribution and use in source and binary forms, with or without
      6  1.1  cgd  * modification, are permitted provided that the following conditions
      7  1.1  cgd  * are met:
      8  1.1  cgd  * 1. Redistributions of source code must retain the above copyright
      9  1.1  cgd  *    notice, this list of conditions and the following disclaimer.
     10  1.1  cgd  * 2. Redistributions in binary form must reproduce the above copyright
     11  1.1  cgd  *    notice, this list of conditions and the following disclaimer in the
     12  1.1  cgd  *    documentation and/or other materials provided with the distribution.
     13  1.1  cgd  * 3. All advertising materials mentioning features or use of this software
     14  1.1  cgd  *    must display the following acknowledgement:
     15  1.1  cgd  *	This product includes software developed by the University of
     16  1.1  cgd  *	California, Berkeley and its contributors.
     17  1.1  cgd  * 4. Neither the name of the University nor the names of its contributors
     18  1.1  cgd  *    may be used to endorse or promote products derived from this software
     19  1.1  cgd  *    without specific prior written permission.
     20  1.1  cgd  *
     21  1.1  cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  1.1  cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  1.1  cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  1.1  cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  1.1  cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  1.1  cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  1.1  cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  1.1  cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  1.1  cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  1.1  cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  1.1  cgd  * SUCH DAMAGE.
     32  1.1  cgd  */
     33  1.1  cgd 
     34  1.1  cgd #ifndef lint
     35  1.1  cgd char copyright[] =
     36  1.1  cgd "@(#) Copyright (c) 1989 The Regents of the University of California.\n\
     37  1.1  cgd  All rights reserved.\n";
     38  1.1  cgd #endif /* not lint */
     39  1.1  cgd 
     40  1.1  cgd #ifndef lint
     41  1.1  cgd static char sccsid[] = "@(#)nice.c	5.4 (Berkeley) 6/1/90";
     42  1.1  cgd #endif /* not lint */
     43  1.1  cgd 
     44  1.1  cgd #include <sys/time.h>
     45  1.1  cgd #include <sys/resource.h>
     46  1.1  cgd #include <stdio.h>
     47  1.1  cgd #include <ctype.h>
     48  1.2  jtc #include <string.h>
     49  1.1  cgd 
     50  1.1  cgd #define	DEFNICE	10
     51  1.1  cgd 
     52  1.1  cgd /* ARGSUSED */
     53  1.1  cgd main(argc, argv)
     54  1.1  cgd 	int argc;
     55  1.1  cgd 	char **argv;
     56  1.1  cgd {
     57  1.1  cgd 	extern int errno;
     58  1.1  cgd 	int niceness;
     59  1.1  cgd 
     60  1.2  jtc 	if (!argv[1])
     61  1.2  jtc 		usage();
     62  1.2  jtc 
     63  1.1  cgd 	niceness = DEFNICE;
     64  1.1  cgd 	if (argv[1][0] == '-')
     65  1.2  jtc 		if (isdigit(argv[1][1]) || argv[1][1] == '-') {
     66  1.1  cgd 			niceness = atoi(argv[1] + 1);
     67  1.1  cgd 			++argv;
     68  1.1  cgd 		}
     69  1.1  cgd 		else {
     70  1.1  cgd 			(void)fprintf(stderr, "nice: illegal option -- %c\n",
     71  1.1  cgd 			    argv[1][1]);
     72  1.1  cgd 			usage();
     73  1.1  cgd 		}
     74  1.1  cgd 
     75  1.1  cgd 	if (!argv[1])
     76  1.1  cgd 		usage();
     77  1.1  cgd 
     78  1.1  cgd 	errno = 0;
     79  1.1  cgd 	niceness += getpriority(PRIO_PROCESS, 0);
     80  1.1  cgd 	if (errno) {
     81  1.1  cgd 		(void)fprintf(stderr, "nice: getpriority: %s\n",
     82  1.1  cgd 		    strerror(errno));
     83  1.1  cgd 		exit(1);
     84  1.1  cgd 	}
     85  1.1  cgd 	if (setpriority(PRIO_PROCESS, 0, niceness)) {
     86  1.2  jtc 		(void)fprintf(stderr, "nice: setpriority: %s\n",
     87  1.2  jtc 		    strerror(errno));
     88  1.1  cgd 		exit(1);
     89  1.1  cgd 	}
     90  1.1  cgd 	execvp(argv[1], &argv[1]);
     91  1.1  cgd 	(void)fprintf(stderr,
     92  1.1  cgd 	    "nice: %s: %s\n", argv[1], strerror(errno));
     93  1.1  cgd 	exit(1);
     94  1.1  cgd }
     95  1.1  cgd 
     96  1.1  cgd usage()
     97  1.1  cgd {
     98  1.1  cgd 	(void)fprintf(stderr,
     99  1.1  cgd 	    "nice [ -# ] command [ options ] [ operands ]\n");
    100  1.1  cgd 	exit(1);
    101  1.1  cgd }
    102