/*
 * Copyright (c) 1995
 *      Mark Murray.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY MARK MURRAY 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 AUTHOR 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/rndcontrol/rndcontrol.c,v 1.11.2.1 2000/05/10 02:04:44 obrien Exp $
 * $DragonFly: src/usr.sbin/rndcontrol/rndcontrol.c,v 1.4 2005/12/05 02:40:28 swildner Exp $
 */

#include <sys/random.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>

static void
usage(void)
{
        fprintf(stderr, "usage: rndcontrol [-q] [-s irq_no] [-c irq_no]\n");
        exit(1);
}

int
main(int argc, char *argv[])
{
        int verbose, ch, fd, result, i;
        u_int16_t irq;

        verbose = 1;

        fd = open("/dev/random", O_RDONLY, 0);
        if (fd == -1) {
                warn("/dev/random");
                return (1);
        }
        else {
                while ((ch = getopt(argc, argv, "qs:c:")) != -1)
                        switch (ch) {
                        case 'q':
                                verbose = 0;
                                break;
                        case 's':
                                irq = (u_int16_t)atoi(optarg);
                                if (verbose)
                                        printf("%s: setting irq %d\n", argv[0], irq);
                                result = ioctl(fd, MEM_SETIRQ, (char *)&irq);
                                if (result == -1) {
                                        warn("%s", argv[0]);
                                        return (1);
                                }
                                break;
                        case 'c':
                                irq = (u_int16_t)atoi(optarg);
                                if (verbose)
                                        printf("%s: clearing irq %d\n", argv[0], irq);
                                result = ioctl(fd, MEM_CLEARIRQ, (char *)&irq);
                                if (result == -1) {
                                        warn("%s", argv[0]);
                                        return (1);
                                }
                                break;
                        case '?':
                        default:
                                usage();
                        }
                }
                if (verbose) {
                        printf("%s: interrupts in use:", argv[0]);
                        irq = 0;
                        for (;;) {
                            result = ioctl(fd, MEM_FINDIRQ, (char *)&irq);
                            if (result < 0)
                                break;
                            printf(" %d", irq);
                            ++irq;
                        }
                        if (result < 0 && errno == ENOTSUP) {
                            printf(" unknown");
                        }
                        printf("\n");
                }
                argc -= optind;
                argv += optind;

                if (argc) {
                        fprintf(stderr, "%s: unknown argument(s): ", argv[-optind]);
                        for (i = 0; i < argc; i++)
                                fprintf(stderr, " %s", argv[i]);
                        fprintf(stderr, "\n");
                }

        return 0;
}