mirror of
https://github.com/systemd/systemd-stable.git
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8d1425d547
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
166 lines
4.4 KiB
C
166 lines
4.4 KiB
C
/*
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* udev_event.c - udev event process
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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 <dirent.h>
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#include <syslog.h>
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#include <sys/stat.h>
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#include "libsysfs/sysfs/libsysfs.h"
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#include "udev_libc_wrapper.h"
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#include "udev.h"
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#include "logging.h"
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#include "udev_rules.h"
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#include "udev_utils.h"
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#include "list.h"
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dev_t get_devt(struct sysfs_class_device *class_dev)
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{
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struct sysfs_attribute *attr = NULL;
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unsigned int major, minor;
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char *maj, *min;
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maj = getenv("MAJOR");
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min = getenv("MINOR");
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if (maj && min) {
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major = atoi(maj);
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minor = atoi(min);
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} else {
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attr = sysfs_get_classdev_attr(class_dev, "dev");
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if (attr == NULL)
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return 0;
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dbg("dev='%s'", attr->value);
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if (sscanf(attr->value, "%u:%u", &major, &minor) != 2)
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return 0;
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}
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dbg("found major=%d, minor=%d", major, minor);
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return makedev(major, minor);
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}
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int udev_process_event(struct udev_rules *rules, struct udevice *udev)
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{
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int retval;
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char path[PATH_SIZE];
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if (udev->type == DEV_BLOCK || udev->type == DEV_CLASS || udev->type == DEV_NET) {
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/* handle device node */
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if (strcmp(udev->action, "add") == 0) {
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struct sysfs_class_device *class_dev;
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dbg("node add");
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snprintf(path, sizeof(path), "%s%s", sysfs_path, udev->devpath);
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path[sizeof(path)-1] = '\0';
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class_dev = sysfs_open_class_device_path(path);
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if (class_dev == NULL) {
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dbg("open class device failed");
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return 0;
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}
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dbg("opened class_dev->name='%s'", class_dev->name);
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/* get major/minor */
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if (udev->type == DEV_BLOCK || udev->type == DEV_CLASS)
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udev->devt = get_devt(class_dev);
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if (udev->type == DEV_NET || udev->devt) {
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/* name device */
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udev_rules_get_name(rules, udev, class_dev);
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if (udev->ignore_device) {
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info("device event will be ignored");
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sysfs_close_class_device(class_dev);
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return 0;
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}
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if (udev->name[0] != '\0') {
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/* create node, store in db */
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retval = udev_add_device(udev, class_dev);
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} else {
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info("device node creation supressed");
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}
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} else {
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dbg("no dev-file found");
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udev_rules_get_run(rules, udev, class_dev, NULL);
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if (udev->ignore_device) {
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info("device event will be ignored");
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sysfs_close_class_device(class_dev);
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return 0;
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}
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}
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sysfs_close_class_device(class_dev);
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} else if (strcmp(udev->action, "remove") == 0) {
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struct name_entry *name_loop;
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/* get data from db, remove db-entry, delete node */
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dbg("node remove");
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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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udev_rules_get_run(rules, udev, NULL, NULL);
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if (udev->ignore_device) {
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dbg("device event will be ignored");
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return 0;
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}
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}
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/* export name of device node or netif */
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if (udev->devname[0] != '\0')
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setenv("DEVNAME", udev->devname, 1);
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} else if (udev->type == DEV_DEVICE && strcmp(udev->action, "add") == 0) {
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struct sysfs_device *devices_dev;
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dbg("devices add");
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snprintf(path, sizeof(path), "%s%s", sysfs_path, udev->devpath);
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path[sizeof(path)-1] = '\0';
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devices_dev = sysfs_open_device_path(path);
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if (!devices_dev) {
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dbg("devices device unavailable (probably remove has beaten us)");
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return 0;
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}
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dbg("devices device opened '%s'", path);
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udev_rules_get_run(rules, udev, NULL, devices_dev);
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sysfs_close_device(devices_dev);
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if (udev->ignore_device) {
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info("device event will be ignored");
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return 0;
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}
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} else {
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dbg("default handling");
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udev_rules_get_run(rules, udev, NULL, NULL);
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if (udev->ignore_device) {
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info("device event will be ignored");
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return 0;
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}
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}
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return 0;
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}
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