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/*
* udev_event.c - udev event process
*
* 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 <dirent.h>
#include <syslog.h>
#include <sys/stat.h>
#include "libsysfs/sysfs/libsysfs.h"
#include "udev_libc_wrapper.h"
#include "udev.h"
#include "logging.h"
#include "udev_rules.h"
#include "udev_utils.h"
#include "list.h"
dev_t get_devt(struct sysfs_class_device *class_dev)
{
struct sysfs_attribute *attr = NULL;
unsigned int major, minor;
char *maj, *min;
maj = getenv("MAJOR");
min = getenv("MINOR");
if (maj && min) {
major = atoi(maj);
minor = atoi(min);
} else {
attr = sysfs_get_classdev_attr(class_dev, "dev");
if (attr == NULL)
return 0;
dbg("dev='%s'", attr->value);
if (sscanf(attr->value, "%u:%u", &major, &minor) != 2)
return 0;
}
dbg("found major=%d, minor=%d", major, minor);
return makedev(major, minor);
}
int udev_process_event(struct udev_rules *rules, struct udevice *udev)
{
int retval;
char path[PATH_SIZE];
if (udev->type == DEV_BLOCK || udev->type == DEV_CLASS || udev->type == DEV_NET) {
/* handle device node */
if (strcmp(udev->action, "add") == 0) {
struct sysfs_class_device *class_dev;
dbg("node add");
snprintf(path, sizeof(path), "%s%s", sysfs_path, udev->devpath);
path[sizeof(path)-1] = '\0';
class_dev = sysfs_open_class_device_path(path);
if (class_dev == NULL) {
dbg("open class device failed");
return 0;
}
dbg("opened class_dev->name='%s'", class_dev->name);
/* get major/minor */
if (udev->type == DEV_BLOCK || udev->type == DEV_CLASS)
udev->devt = get_devt(class_dev);
if (udev->type == DEV_NET || udev->devt) {
/* name device */
udev_rules_get_name(rules, udev, class_dev);
if (udev->ignore_device) {
info("device event will be ignored");
sysfs_close_class_device(class_dev);
return -1;
}
if (udev->name[0] != '\0') {
/* create node, store in db */
retval = udev_add_device(udev, class_dev);
} else {
info("device node creation supressed");
}
} else {
dbg("no dev-file found");
udev_rules_get_run(rules, udev, class_dev, NULL);
if (udev->ignore_device) {
info("device event will be ignored");
sysfs_close_class_device(class_dev);
return -1;
}
}
sysfs_close_class_device(class_dev);
} else if (strcmp(udev->action, "remove") == 0) {
struct name_entry *name_loop;
/* get data from db, remove db-entry, delete node */
dbg("node remove");
retval = udev_remove_device(udev);
/* restore stored persistent data */
list_for_each_entry(name_loop, &udev->env_list, node)
putenv(name_loop->name);
udev_rules_get_run(rules, udev, NULL, NULL);
if (udev->ignore_device) {
dbg("device event will be ignored");
return -1;
}
}
/* export name of device node or netif */
if (udev->devname[0] != '\0')
setenv("DEVNAME", udev->devname, 1);
} else if (udev->type == DEV_DEVICE && strcmp(udev->action, "add") == 0) {
struct sysfs_device *devices_dev;
dbg("devices add");
snprintf(path, sizeof(path), "%s%s", sysfs_path, udev->devpath);
path[sizeof(path)-1] = '\0';
devices_dev = sysfs_open_device_path(path);
if (!devices_dev) {
dbg("devices device unavailable (probably remove has beaten us)");
return 0;
}
dbg("devices device opened '%s'", path);
udev_rules_get_run(rules, udev, NULL, devices_dev);
sysfs_close_device(devices_dev);
if (udev->ignore_device) {
info("device event will be ignored");
return -1;
}
} else {
dbg("default handling");
udev_rules_get_run(rules, udev, NULL, NULL);
if (udev->ignore_device) {
info("device event will be ignored");
return -1;
}
}
return 0;
}
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