diff options
Diffstat (limited to 'tools/rmmod.c')
| -rw-r--r-- | tools/rmmod.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/tools/rmmod.c b/tools/rmmod.c new file mode 100644 index 0000000..3942e7b --- /dev/null +++ b/tools/rmmod.c @@ -0,0 +1,203 @@ +/* + * 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 <http://www.gnu.org/licenses/>. + */ + +#include <errno.h> +#include <getopt.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <sys/stat.h> +#include <sys/types.h> + +#include <shared/macro.h> + +#include <libkmod/libkmod.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, ret; + + 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; + } + + ret = kmod_module_get_refcnt(mod); + if (ret > 0) { + ERR("Module %s is in use\n", kmod_module_get_name(mod)); + return -EBUSY; + } else if (ret == -ENOENT) { + ERR("Module unloading is not supported\n"); + } + + return ret; +} + +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); + puts(KMOD_FEATURES); + 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", +}; |