/*
 * Copyright (c) 1994 David Greenman
 * Copyright (c) 1994 Henrik Vestergaard Draboel (hvd@terry.ping.dk)
 * 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 Henrik Vestergaard Draboel.
 *      This product includes software developed by David Greenman.
 * 4. Neither the names of the authors nor the names of contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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.
 *
 * $FreeBSD: src/usr.sbin/rtprio/rtprio.c,v 1.8.2.1 2001/01/29 08:07:26 kuriyama Exp $
 * $DragonFly: src/usr.sbin/rtprio/rtprio.c,v 1.5 2005/02/04 21:32:55 cpressey Exp $
 */

#include <sys/param.h>
#include <sys/rtprio.h>
#include <sys/errno.h>

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

static void usage(void);

int
main(int argc, char **argv)
{
        char   *p;
        int     proc = 0;
        struct rtprio rtp;

        /* find basename */
        if ((p = strrchr(argv[0], '/')) == NULL)
                p = argv[0];
        else
                ++p;

        if (!strcmp(p, "rtprio"))
                rtp.type = RTP_PRIO_REALTIME;
        else if (!strcmp(p, "idprio"))
                rtp.type = RTP_PRIO_IDLE;

        switch (argc) {
        case 2:
                proc = abs(atoi(argv[1]));      /* Should check if numeric
                                                 * arg! */
                /* FALLTHROUGH */
        case 1:
                if (rtprio(RTP_LOOKUP, proc, &rtp) != 0)
                        err(1, "%s", argv[0]);
                printf("%s: ", p);
                switch (rtp.type) {
                case RTP_PRIO_REALTIME:
                case RTP_PRIO_FIFO:
                        printf("realtime priority %d\n", rtp.prio);
                        break;
                case RTP_PRIO_NORMAL:
                        printf("normal priority\n");
                        break;
                case RTP_PRIO_IDLE:
                        printf("idle priority %d\n", rtp.prio);
                        break;
                default:
                        printf("invalid priority type %d\n", rtp.type);
                        break;
                }
                exit(0);
        default:
                if (argv[1][0] == '-' || isdigit(argv[1][0])) {
                        if (argv[1][0] == '-') {
                                if (strcmp(argv[1], "-t") == 0) {
                                        rtp.type = RTP_PRIO_NORMAL;
                                        rtp.prio = 0;
                                } else {
                                        usage();
                                        break;
                                }
                        } else {
                                rtp.prio = atoi(argv[1]);
                        }
                } else {
                        usage();
                        break;
                }

                if (argv[2][0] == '-')
                        proc = -atoi(argv[2]);

                if (rtprio(RTP_SET, proc, &rtp) != 0)
                        err(1, "%s", argv[0]);

                if (proc == 0) {
                        execvp(argv[2], &argv[2]);
                        err(1, "%s", argv[2]);
                }
                exit(0);
        }
        exit (1);
}

static void
usage(void)
{
        fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n",
                "usage: [id|rt]prio",
                "       [id|rt]prio [-]pid",
                "       [id|rt]prio priority command [args]",
                "       [id|rt]prio priority -pid",
                "       [id|rt]prio -t command [args]",
                "       [id|rt]prio -t -pid");
        exit(1);
}