1 /* 2 * kmod-rmmod - remove modules from linux kernel using libkmod. 3 * 4 * Copyright (C) 2011-2013 ProFUSION embedded systems 5 * 6 * This program is free software: you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation, either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include <errno.h> 21 #include <getopt.h> 22 #include <stdio.h> 23 #include <stdlib.h> 24 #include <string.h> 25 #include <unistd.h> 26 #include <sys/stat.h> 27 #include <sys/types.h> 28 29 #include <shared/macro.h> 30 31 #include <libkmod/libkmod.h> 32 33 #include "kmod.h" 34 35 #define DEFAULT_VERBOSE LOG_ERR 36 static int verbose = DEFAULT_VERBOSE; 37 static int use_syslog; 38 39 static const char cmdopts_s[] = "fsvVwh"; 40 static const struct option cmdopts[] = { 41 {"force", no_argument, 0, 'f'}, 42 {"syslog", no_argument, 0, 's'}, 43 {"verbose", no_argument, 0, 'v'}, 44 {"version", no_argument, 0, 'V'}, 45 {"help", no_argument, 0, 'h'}, 46 {NULL, 0, 0, 0} 47 }; 48 49 static void help(void) 50 { 51 printf("Usage:\n" 52 "\t%s [options] modulename ...\n" 53 "Options:\n" 54 "\t-f, --force forces a module unload and may crash your\n" 55 "\t machine. This requires Forced Module Removal\n" 56 "\t option in your kernel. DANGEROUS\n" 57 "\t-s, --syslog print to syslog, not stderr\n" 58 "\t-v, --verbose enables more messages\n" 59 "\t-V, --version show version\n" 60 "\t-h, --help show this help\n", 61 program_invocation_short_name); 62 } 63 64 static int check_module_inuse(struct kmod_module *mod) { 65 struct kmod_list *holders; 66 int state; 67 68 state = kmod_module_get_initstate(mod); 69 70 if (state == KMOD_MODULE_BUILTIN) { 71 ERR("Module %s is builtin.\n", kmod_module_get_name(mod)); 72 return -ENOENT; 73 } else if (state < 0) { 74 ERR("Module %s is not currently loaded\n", 75 kmod_module_get_name(mod)); 76 return -ENOENT; 77 } 78 79 holders = kmod_module_get_holders(mod); 80 if (holders != NULL) { 81 struct kmod_list *itr; 82 83 ERR("Module %s is in use by:", kmod_module_get_name(mod)); 84 85 kmod_list_foreach(itr, holders) { 86 struct kmod_module *hm = kmod_module_get_module(itr); 87 fprintf(stderr, " %s", kmod_module_get_name(hm)); 88 kmod_module_unref(hm); 89 } 90 fputc('\n', stderr); 91 92 kmod_module_unref_list(holders); 93 return -EBUSY; 94 } 95 96 if (kmod_module_get_refcnt(mod) != 0) { 97 ERR("Module %s is in use\n", kmod_module_get_name(mod)); 98 return -EBUSY; 99 } 100 101 return 0; 102 } 103 104 static int do_rmmod(int argc, char *argv[]) 105 { 106 struct kmod_ctx *ctx; 107 const char *null_config = NULL; 108 int flags = 0; 109 int i, err, r = 0; 110 111 for (;;) { 112 int c, idx = 0; 113 c = getopt_long(argc, argv, cmdopts_s, cmdopts, &idx); 114 if (c == -1) 115 break; 116 switch (c) { 117 case 'f': 118 flags |= KMOD_REMOVE_FORCE; 119 break; 120 case 's': 121 use_syslog = 1; 122 break; 123 case 'v': 124 verbose++; 125 break; 126 case 'h': 127 help(); 128 return EXIT_SUCCESS; 129 case 'V': 130 puts(PACKAGE " version " VERSION); 131 puts(KMOD_FEATURES); 132 return EXIT_SUCCESS; 133 case '?': 134 return EXIT_FAILURE; 135 default: 136 ERR("unexpected getopt_long() value '%c'.\n", c); 137 return EXIT_FAILURE; 138 } 139 } 140 141 log_open(use_syslog); 142 143 if (optind >= argc) { 144 ERR("missing module name.\n"); 145 r = EXIT_FAILURE; 146 goto done; 147 } 148 149 ctx = kmod_new(NULL, &null_config); 150 if (!ctx) { 151 ERR("kmod_new() failed!\n"); 152 r = EXIT_FAILURE; 153 goto done; 154 } 155 156 log_setup_kmod_log(ctx, verbose); 157 158 for (i = optind; i < argc; i++) { 159 struct kmod_module *mod; 160 const char *arg = argv[i]; 161 struct stat st; 162 if (stat(arg, &st) == 0) 163 err = kmod_module_new_from_path(ctx, arg, &mod); 164 else 165 err = kmod_module_new_from_name(ctx, arg, &mod); 166 167 if (err < 0) { 168 ERR("could not use module %s: %s\n", arg, 169 strerror(-err)); 170 break; 171 } 172 173 if (!(flags & KMOD_REMOVE_FORCE) && check_module_inuse(mod) < 0) { 174 r++; 175 goto next; 176 } 177 178 err = kmod_module_remove_module(mod, flags); 179 if (err < 0) { 180 ERR("could not remove module %s: %s\n", arg, 181 strerror(-err)); 182 r++; 183 } 184 next: 185 kmod_module_unref(mod); 186 } 187 188 kmod_unref(ctx); 189 190 done: 191 log_close(); 192 193 return r == 0 ? EXIT_SUCCESS : EXIT_FAILURE; 194 } 195 196 const struct kmod_cmd kmod_cmd_compat_rmmod = { 197 .name = "rmmod", 198 .cmd = do_rmmod, 199 .help = "compat rmmod command", 200 }; 201
