/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 1997 Doug Rabson
 * 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 THE AUTHOR 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.
 */

#include <sys/param.h>
#include <sys/linker.h>

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <sysexits.h>
#include <unistd.h>

static void
usage(void)
{
        fprintf(stderr, "usage: kldunload [-fv] -i id ...\n");
        fprintf(stderr, "       kldunload [-fv] [-n] name ...\n");
        exit(EX_USAGE);
}

#define OPT_NULL        0x00
#define OPT_ID          0x01
#define OPT_VERBOSE     0x02
#define OPT_FORCE       0x04

int
main(int argc, char** argv)
{
        struct kld_file_stat stat;
        int c, fileid, force, opt;
        char *filename;

        filename = NULL;
        opt = OPT_NULL;

        while ((c = getopt(argc, argv, "finv")) != -1) {
                switch (c) {
                case 'f':
                        opt |= OPT_FORCE;
                        break;
                case 'i':
                        opt |= OPT_ID;
                        break;
                case 'n':
                        /* 
                         * XXX: For backward compatibility. Currently does
                         * nothing
                         */
                        break;
                case 'v':
                        opt |= OPT_VERBOSE;
                        break;
                default:
                        usage();
                }
        }

        argc -= optind;
        argv += optind;

        if (argc == 0)
                usage();

        while ((filename = *argv++) != NULL) {
                if (opt & OPT_ID) {
                        fileid = atoi(filename);
                        if (fileid < 0)
                                errx(EXIT_FAILURE, "Invalid ID %s", optarg);
                } else {
                        if ((fileid = kldfind(filename)) < 0)
                                errx(EXIT_FAILURE, "can't find file %s",
                                    filename);
                }
                if (opt & OPT_VERBOSE) {
                        stat.version = sizeof(stat);
                        if (kldstat(fileid, &stat) < 0)
                                err(EXIT_FAILURE, "can't stat file");
                        (void) printf("Unloading %s, id=%d\n", stat.name,
                            fileid);
                }
                if (opt & OPT_FORCE)
                        force = LINKER_UNLOAD_FORCE;
                else
                        force = LINKER_UNLOAD_NORMAL;

                if (kldunloadf(fileid, force) < 0)
                        err(EXIT_FAILURE, "can't unload file");
        }

        return (EXIT_SUCCESS);
}