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