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/*
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* kmod-rmmod - remove modules from linux kernel using libkmod.
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*
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* Copyright (C) 2011-2013 ProFUSION embedded systems
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <errno.h>
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#include <getopt.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <shared/macro.h>
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#include <libkmod/libkmod.h>
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#include "kmod.h"
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#define DEFAULT_VERBOSE LOG_ERR
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static int verbose = DEFAULT_VERBOSE;
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static int use_syslog;
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static const char cmdopts_s[] = "fsvVwh";
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static const struct option cmdopts[] = {
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{"force", no_argument, 0, 'f'},
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{"syslog", no_argument, 0, 's'},
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{"verbose", no_argument, 0, 'v'},
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{"version", no_argument, 0, 'V'},
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{"help", no_argument, 0, 'h'},
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{NULL, 0, 0, 0}
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};
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static void help(void)
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{
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printf("Usage:\n"
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"\t%s [options] modulename ...\n"
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"Options:\n"
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"\t-f, --force forces a module unload and may crash your\n"
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"\t machine. This requires Forced Module Removal\n"
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"\t option in your kernel. DANGEROUS\n"
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"\t-s, --syslog print to syslog, not stderr\n"
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"\t-v, --verbose enables more messages\n"
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"\t-V, --version show version\n"
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"\t-h, --help show this help\n",
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program_invocation_short_name);
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}
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static int check_module_inuse(struct kmod_module *mod) {
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struct kmod_list *holders;
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int state;
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state = kmod_module_get_initstate(mod);
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if (state == KMOD_MODULE_BUILTIN) {
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ERR("Module %s is builtin.\n", kmod_module_get_name(mod));
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return -ENOENT;
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} else if (state < 0) {
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ERR("Module %s is not currently loaded\n",
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kmod_module_get_name(mod));
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return -ENOENT;
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}
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holders = kmod_module_get_holders(mod);
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if (holders != NULL) {
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struct kmod_list *itr;
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ERR("Module %s is in use by:", kmod_module_get_name(mod));
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kmod_list_foreach(itr, holders) {
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struct kmod_module *hm = kmod_module_get_module(itr);
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fprintf(stderr, " %s", kmod_module_get_name(hm));
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kmod_module_unref(hm);
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}
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fputc('\n', stderr);
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kmod_module_unref_list(holders);
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return -EBUSY;
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}
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if (kmod_module_get_refcnt(mod) != 0) {
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ERR("Module %s is in use\n", kmod_module_get_name(mod));
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return -EBUSY;
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}
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return 0;
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}
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static int do_rmmod(int argc, char *argv[])
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{
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struct kmod_ctx *ctx;
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const char *null_config = NULL;
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int flags = 0;
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int i, err, r = 0;
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for (;;) {
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int c, idx = 0;
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c = getopt_long(argc, argv, cmdopts_s, cmdopts, &idx);
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if (c == -1)
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break;
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switch (c) {
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case 'f':
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flags |= KMOD_REMOVE_FORCE;
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break;
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case 's':
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use_syslog = 1;
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break;
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case 'v':
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verbose++;
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break;
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case 'h':
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help();
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return EXIT_SUCCESS;
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case 'V':
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puts(PACKAGE " version " VERSION);
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puts(KMOD_FEATURES);
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return EXIT_SUCCESS;
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case '?':
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return EXIT_FAILURE;
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default:
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ERR("unexpected getopt_long() value '%c'.\n", c);
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return EXIT_FAILURE;
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}
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}
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log_open(use_syslog);
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if (optind >= argc) {
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ERR("missing module name.\n");
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r = EXIT_FAILURE;
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goto done;
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}
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ctx = kmod_new(NULL, &null_config);
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if (!ctx) {
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ERR("kmod_new() failed!\n");
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r = EXIT_FAILURE;
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goto done;
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}
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log_setup_kmod_log(ctx, verbose);
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for (i = optind; i < argc; i++) {
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struct kmod_module *mod;
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const char *arg = argv[i];
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struct stat st;
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if (stat(arg, &st) == 0)
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err = kmod_module_new_from_path(ctx, arg, &mod);
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else
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err = kmod_module_new_from_name(ctx, arg, &mod);
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if (err < 0) {
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ERR("could not use module %s: %s\n", arg,
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strerror(-err));
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break;
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}
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if (!(flags & KMOD_REMOVE_FORCE) && check_module_inuse(mod) < 0) {
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r++;
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goto next;
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}
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err = kmod_module_remove_module(mod, flags);
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if (err < 0) {
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ERR("could not remove module %s: %s\n", arg,
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strerror(-err));
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r++;
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}
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next:
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kmod_module_unref(mod);
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}
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kmod_unref(ctx);
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done:
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log_close();
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return r == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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const struct kmod_cmd kmod_cmd_compat_rmmod = {
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.name = "rmmod",
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.cmd = do_rmmod,
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.help = "compat rmmod command",
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};
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