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/*
* 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"
static struct kmod_ctx *ctx = NULL;
static int load_module(struct udev *udev, const char *alias) {
int err;
#ifdef HAVE_LIBKMOD
struct kmod_list *list = NULL;
struct kmod_list *l;
err = kmod_module_new_from_lookup(ctx, alias, &list);
if (err < 0)
return err;
if (list == NULL)
log_debug("No module matches '%s'", 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", kmod_module_get_name(mod));
else if (err == 0)
log_debug("Inserted '%s'", kmod_module_get_name(mod));
else
log_debug("Failed to insert '%s'", kmod_module_get_name(mod));
kmod_module_unref(mod);
}
kmod_module_unref_list(list);
#else
/*
These 3 temporaries are needed because argv (below) is a const pointer, not pointer to const
*/
char *tmp_alias = strdup(alias);
char *tmp_modprobe = strdup(MODPROBE);
char *tmp_bq = strdup("-bq");
char *const argv[] = { tmp_modprobe, tmp_bq, tmp_alias, 0 };
err = execute_command(MODPROBE, argv);
free(tmp_alias);
free(tmp_modprobe);
free(tmp_bq);
#endif
/* both 'kmod_module_new_from_lookup' and 'execute_command' return <0 on error
so it is ok to assign both to 'err' */
return err;
}
_printf_(6,0) static void udev_kmod_log(void *data, int priority, const char *file, int line, const char *fn, const char *format, va_list args) {
log_internalv(priority, 0, 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 || !streq(argv[1], "load")) {
log_error("expect: %s load <module>", argv[0]);
return EXIT_FAILURE;
}
for (i = 2; argv[i]; i++) {
log_debug("Execute '%s' '%s'", 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");
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");
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");
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,
};
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