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/*
* udev_utils.c - generic stuff used by udev
*
* Copyright (C) 2004, 2005 Kay Sievers <kay.sievers@vrfy.org>
*
* 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 version 2 of the License.
*
* 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, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <stddef.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include "udev.h"
#include "udev_rules.h"
struct udevice *udev_device_init(void)
{
struct udevice *udev;
udev = malloc(sizeof(struct udevice));
if (udev == NULL)
return NULL;
memset(udev, 0x00, sizeof(struct udevice));
INIT_LIST_HEAD(&udev->symlink_list);
INIT_LIST_HEAD(&udev->run_list);
INIT_LIST_HEAD(&udev->env_list);
/* set sysfs device to local storage, can be overridden if needed */
udev->dev = &udev->dev_local;
/* default node permissions */
udev->mode = 0660;
strcpy(udev->owner, "root");
strcpy(udev->group, "root");
return udev;
}
void udev_device_cleanup(struct udevice *udev)
{
name_list_cleanup(&udev->symlink_list);
name_list_cleanup(&udev->run_list);
name_list_cleanup(&udev->env_list);
free(udev);
}
dev_t udev_device_get_devt(struct udevice *udev)
{
const char *attr;
unsigned int major, minor;
/* read it from sysfs */
attr = sysfs_attr_get_value(udev->dev->devpath, "dev");
if (attr != NULL) {
if (sscanf(attr, "%u:%u", &major, &minor) == 2)
return makedev(major, minor);
}
return makedev(0, 0);
}
int udev_device_event(struct udev_rules *rules, struct udevice *udev)
{
int retval = 0;
/* device node or netif */
if ((major(udev->devt) != 0 || strcmp(udev->dev->subsystem, "net") == 0) &&
strcmp(udev->action, "add") == 0) {
dbg("device node or netif add '%s'", udev->dev->devpath);
udev_rules_get_name(rules, udev);
if (udev->ignore_device) {
info("device event will be ignored");
return 0;
}
/* create node, store in db */
if (udev->name[0] != '\0')
retval = udev_add_device(udev);
else
info("device node creation supressed");
return retval;
}
if (major(udev->devt) != 0 && strcmp(udev->action, "remove") == 0) {
struct name_entry *name_loop;
udev_rules_get_run(rules, udev);
if (udev->ignore_device) {
info("device event will be ignored");
return 0;
}
/* get data from db, remove db-entry, delete node */
retval = udev_remove_device(udev);
/* restore stored persistent data */
list_for_each_entry(name_loop, &udev->env_list, node)
putenv(name_loop->name);
return retval;
}
/* default devices without a node */
udev_rules_get_run(rules, udev);
if (udev->ignore_device)
info("device event will be ignored");
return retval;
}
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