BSD 4_3_Net_2 release

[unix-history] / usr / src / usr.bin / nice / nice.c

/*
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)nice.c      5.4 (Berkeley) 6/1/90";
#endif /* not lint */

#include <sys/time.h>
#include <sys/resource.h>
#include <stdio.h>
#include <ctype.h>

#define DEFNICE 10

/* ARGSUSED */
main(argc, argv)
       int argc;
       char **argv;
{
       extern int errno;
       int niceness;
       char *strerror();

       niceness = DEFNICE;
       if (argv[1][0] == '-')
               if (isdigit(argv[1][1])) {
                       niceness = atoi(argv[1] + 1);
                       ++argv;
               }
               else {
                       (void)fprintf(stderr, "nice: illegal option -- %c\n",
                           argv[1][1]);
                       usage();
               }

       if (!argv[1])
               usage();

       errno = 0;
       niceness += getpriority(PRIO_PROCESS, 0);
       if (errno) {
               (void)fprintf(stderr, "nice: getpriority: %s\n",
                   strerror(errno));
               exit(1);
       }
       if (setpriority(PRIO_PROCESS, 0, niceness)) {
               (void)fprintf(stderr,
                   "nice: setpriority: %s\n", strerror(errno));
               exit(1);
       }
       execvp(argv[1], &argv[1]);
       (void)fprintf(stderr,
           "nice: %s: %s\n", argv[1], strerror(errno));
       exit(1);
}

usage()
{
       (void)fprintf(stderr,
           "nice [ -# ] command [ options ] [ operands ]\n");
       exit(1);
}