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

/*
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/

#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) %G%";
#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);
}