/*      $NetBSD: nice.c,v 1.15 2008/07/21 14:19:24 lukem Exp $  */

/*
* 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. 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.
*/

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1989\
The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)nice.c      5.4 (Berkeley) 6/1/90";
#endif
__RCSID("$NetBSD: nice.c,v 1.15 2008/07/21 14:19:24 lukem Exp $");
#endif /* not lint */

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

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <locale.h>
#include <ctype.h>
#include <errno.h>
#include <err.h>
#include <unistd.h>

#define DEFNICE 10

static void usage(void) __dead;

int
main(int argc, char **argv)
{
       char *ep;
       int niceness = DEFNICE;
       int c;
       long tmp;

       setprogname(argv[0]);
       (void)setlocale(LC_ALL, "");

       /* handle obsolete -number syntax */
       if (argc > 1 && argv[1][0] == '-' &&
           isdigit((unsigned char)argv[1][1])) {
               niceness = atoi (argv[1] + 1);
               argc--; argv++;
       }

       while ((c = getopt (argc, argv, "n:")) != -1) {
               switch (c) {
               case 'n':
                       errno = 0;
                       tmp = strtol(optarg, &ep, 10);
                       if (*ep != '\0' || tmp < INT_MIN || tmp > INT_MAX)
                               errx(EXIT_FAILURE, "invalid argument: `%s'",
                                   optarg);
                       niceness = (int)tmp;
                       break;
               default:
                       usage();
                       break;
               }
       }
       argc -= optind;
       argv += optind;

       if (argc == 0)
               usage();

       errno = 0;
       niceness += getpriority(PRIO_PROCESS, 0);
       if (errno) {
               err(EXIT_FAILURE, "getpriority");
               /* NOTREACHED */
       }
       if (setpriority(PRIO_PROCESS, 0, niceness) == -1) {
               warn("setpriority");
       }

       (void)execvp(argv[0], &argv[0]);
       err((errno == ENOENT || errno == ENOTDIR) ? 127 : 126, "%s", argv[0]);
       /* NOTREACHED */
}

static void
usage(void)
{
       (void)fprintf(stderr,
           "Usage: %s [ -n increment ] utility [ argument ...]\n",
           getprogname());
       exit(EXIT_FAILURE);
}