mirror of
https://github.com/systemd/systemd-stable.git
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127 lines
3.1 KiB
C
127 lines
3.1 KiB
C
/*
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* udev_utils.c - generic stuff used by udev
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*
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* Copyright (C) 2004, 2005 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <ctype.h>
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#include "udev.h"
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#include "udev_rules.h"
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struct udevice *udev_device_init(void)
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{
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struct udevice *udev;
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udev = malloc(sizeof(struct udevice));
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if (udev == NULL)
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return NULL;
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memset(udev, 0x00, sizeof(struct udevice));
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INIT_LIST_HEAD(&udev->symlink_list);
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INIT_LIST_HEAD(&udev->run_list);
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INIT_LIST_HEAD(&udev->env_list);
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/* set sysfs device to local storage, can be overridden if needed */
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udev->dev = &udev->dev_local;
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/* default node permissions */
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udev->mode = 0660;
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strcpy(udev->owner, "root");
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strcpy(udev->group, "root");
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return udev;
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}
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void udev_device_cleanup(struct udevice *udev)
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{
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name_list_cleanup(&udev->symlink_list);
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name_list_cleanup(&udev->run_list);
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name_list_cleanup(&udev->env_list);
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free(udev);
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}
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dev_t udev_device_get_devt(struct udevice *udev)
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{
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const char *attr;
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unsigned int major, minor;
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/* read it from sysfs */
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attr = sysfs_attr_get_value(udev->dev->devpath, "dev");
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if (attr != NULL) {
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if (sscanf(attr, "%u:%u", &major, &minor) == 2)
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return makedev(major, minor);
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}
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return makedev(0, 0);
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}
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int udev_device_event(struct udev_rules *rules, struct udevice *udev)
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{
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int retval = 0;
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/* device node or netif */
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if ((major(udev->devt) != 0 || strcmp(udev->dev->subsystem, "net") == 0) &&
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strcmp(udev->action, "add") == 0) {
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dbg("device node or netif add '%s'", udev->dev->devpath);
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udev_rules_get_name(rules, udev);
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if (udev->ignore_device) {
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info("device event will be ignored");
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return -1;
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}
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/* create node, store in db */
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if (udev->name[0] != '\0')
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retval = udev_add_device(udev);
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else
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info("device node creation supressed");
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return 0;
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}
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if (major(udev->devt) != 0 && strcmp(udev->action, "remove") == 0) {
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struct name_entry *name_loop;
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udev_rules_get_run(rules, udev);
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if (udev->ignore_device) {
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info("device event will be ignored");
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return -1;
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}
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/* get data from db, remove db-entry, delete node */
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retval = udev_remove_device(udev);
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/* restore stored persistent data */
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list_for_each_entry(name_loop, &udev->env_list, node)
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putenv(name_loop->name);
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return 0;
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}
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/* default devices */
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udev_rules_get_run(rules, udev);
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if (udev->ignore_device) {
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info("device event will be ignored");
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return -1;
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}
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return retval;
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}
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