udev-builtin-kmod.c revision ad29a9f14fa8b1932c0e418bfcf1c10ce6a35a33
/*
* load kernel modules
*
* Copyright (C) 2011 Kay Sievers <kay.sievers@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>
#include <libkmod.h>
#include "udev.h"
static struct kmod_ctx *ctx;
static int load_module(struct udev *udev, const char *alias)
{
struct kmod_list *list = NULL;
struct kmod_list *listb = NULL;
struct kmod_list *l;
int err;
err = kmod_module_new_from_lookup(ctx, alias, &list);
if (err < 0)
return err;
err = kmod_module_get_filtered_blacklist(ctx, list, &listb);
if (err < 0)
return err;
if (list == NULL)
info(udev, "no module matches '%s'\n", alias);
kmod_list_foreach(l, listb) {
struct kmod_module *mod = kmod_module_get_module(l);
err = kmod_module_probe_insert_module(mod, 0, NULL, NULL, NULL);
if (err >=0 )
info(udev, "inserted '%s'\n", kmod_module_get_name(mod));
else
info(udev, "failed to insert '%s'\n", kmod_module_get_name(mod));
kmod_module_unref(mod);
}
kmod_module_unref_list(list);
kmod_module_unref_list(listb);
return err;
}
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);
}
/* needs to re-instantiate the context after a reload */
static int builtin_kmod(struct udev_device *dev, int argc, char *argv[], bool test)
{
struct udev *udev = udev_device_get_udev(dev);
int i;
if (!ctx) {
ctx = kmod_new(NULL, NULL);
if (!ctx)
return -ENOMEM;
info(udev, "load module index\n");
kmod_set_log_fn(ctx, udev_kmod_log, udev);
kmod_load_resources(ctx);
}
if (argc < 3 || strcmp(argv[1], "load")) {
err(udev, "expect: %s load <module>\n", argv[0]);
return EXIT_FAILURE;
}
for (i = 2; argv[i]; i++) {
info(udev, "execute '%s' '%s'\n", argv[1], argv[i]);
load_module(udev, argv[i]);
}
return EXIT_SUCCESS;
}
/* called at udev startup */
static int builtin_kmod_init(struct udev *udev)
{
if (ctx)
return 0;
ctx = kmod_new(NULL, NULL);
if (!ctx)
return -ENOMEM;
info(udev, "load module index\n");
kmod_set_log_fn(ctx, udev_kmod_log, udev);
kmod_load_resources(ctx);
return 0;
}
/* called on udev shutdown and reload request */
static void builtin_kmod_exit(struct udev *udev)
{
info(udev, "unload module index\n");
ctx = kmod_unref(ctx);
}
/* called every couple of seconds during event activity; 'true' if config has changed */
static bool builtin_kmod_validate(struct udev *udev)
{
info(udev, "validate module index\n");
if (kmod_validate_resources(ctx) != KMOD_RESOURCES_OK)
return true;
return false;
}
const struct udev_builtin udev_builtin_kmod = {
.name = "kmod",
.cmd = builtin_kmod,
.init = builtin_kmod_init,
.exit = builtin_kmod_exit,
.validate = builtin_kmod_validate,
.help = "kernel module loader",
.run_once = false,
};