/* * load kernel modules * * Copyright (C) 2011-2012 Kay Sievers <kay@vrfy.org> * Copyright (C) 2011 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 <stdio.h> #include <stdlib.h> #include <stdarg.h> #include <unistd.h> #include <string.h> #include <errno.h> #include <fcntl.h> #include <sys/stat.h> #include <sys/wait.h> #ifdef HAVE_LIBKMOD #include <libkmod.h> #endif #include "udev.h" #include "util.h" static struct kmod_ctx *ctx; static int load_module(struct udev *udev, const char *alias) { #ifdef HAVE_LIBKMOD struct kmod_list *list = NULL; struct kmod_list *l; int err; err = kmod_module_new_from_lookup(ctx, alias, &list); if (err < 0) return err; if (list == NULL) log_debug("no module matches '%s'\n", alias); kmod_list_foreach(l, list) { struct kmod_module *mod = kmod_module_get_module(l); err = kmod_module_probe_insert_module(mod, KMOD_PROBE_APPLY_BLACKLIST, NULL, NULL, NULL, NULL); if (err == KMOD_PROBE_APPLY_BLACKLIST) log_debug("module '%s' is blacklisted\n", kmod_module_get_name(mod)); else if (err == 0) log_debug("inserted '%s'\n", kmod_module_get_name(mod)); else log_debug("failed to insert '%s'\n", kmod_module_get_name(mod)); kmod_module_unref(mod); } kmod_module_unref_list(list); return err; #else char * const argv[] = { MODPROBE, "-bq", alias, 0 }; return execute_command(MODPROBE, argv); #endif } static void udev_kmod_log(void *data, int priority, const char *file, int line, const char *fn, const char *format, va_list args) { udev_main_log(data, priority, file, line, fn, format, args); } static int builtin_kmod(struct udev_device *dev, int argc, char *argv[], bool test) { struct udev *udev = udev_device_get_udev(dev); int i; #ifdef HAVE_LIBKMOD if (!ctx) return 0; #endif if (argc < 3 || strcmp(argv[1], "load")) { log_error("expect: %s load <module>\n", argv[0]); return EXIT_FAILURE; } for (i = 2; argv[i]; i++) { log_debug("execute '%s' '%s'\n", argv[1], argv[i]); load_module(udev, argv[i]); } return EXIT_SUCCESS; } /* called at udev startup and reload */ static int builtin_kmod_init(struct udev *udev) { #ifdef HAVE_LIBKMOD if (ctx) return 0; ctx = kmod_new(NULL, NULL); if (!ctx) return -ENOMEM; log_debug("load module index\n"); kmod_set_log_fn(ctx, udev_kmod_log, udev); kmod_load_resources(ctx); #endif return 0; } /* called on udev shutdown and reload request */ static void builtin_kmod_exit(struct udev *udev) { #ifdef HAVE_LIBKMOD log_debug("unload module index\n"); ctx = kmod_unref(ctx); #endif } #ifdef HAVE_LIBKMOD /* called every couple of seconds during event activity; 'true' if config has changed */ static bool builtin_kmod_validate(struct udev *udev) { log_debug("validate module index\n"); if (!ctx) return false; return (kmod_validate_resources(ctx) != KMOD_RESOURCES_OK); } #endif const struct udev_builtin udev_builtin_kmod = { .name = "kmod", .cmd = builtin_kmod, .init = builtin_kmod_init, .exit = builtin_kmod_exit, #ifdef HAVE_LIBKMOD .validate = builtin_kmod_validate, #endif .help = "kernel module loader", .run_once = false, };