/*      $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);
}