+++ /dev/null
-/***
- This file is part of systemd.
-
- Copyright 2008-2012 Kay Sievers <kay@vrfy.org>
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd 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
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <stddef.h>
-#include <errno.h>
-#include <string.h>
-#include <dirent.h>
-#include <fnmatch.h>
-#include <stdbool.h>
-#include <sys/stat.h>
-
-#include "libudev.h"
-#include "libudev-private.h"
-
-/**
- * SECTION:libudev-enumerate
- * @short_description: lookup and sort sys devices
- *
- * Lookup devices in the sys filesystem, filter devices by properties,
- * and return a sorted list of devices.
- */
-
-struct syspath {
- char *syspath;
- size_t len;
-};
-
-/**
- * udev_enumerate:
- *
- * Opaque object representing one device lookup/sort context.
- */
-struct udev_enumerate {
- struct udev *udev;
- int refcount;
- struct udev_list sysattr_match_list;
- struct udev_list sysattr_nomatch_list;
- struct udev_list subsystem_match_list;
- struct udev_list subsystem_nomatch_list;
- struct udev_list sysname_match_list;
- struct udev_list properties_match_list;
- struct udev_list tags_match_list;
- struct udev_device *parent_match;
- struct udev_list devices_list;
- struct syspath *devices;
- unsigned int devices_cur;
- unsigned int devices_max;
- bool devices_uptodate:1;
- bool match_is_initialized;
-};
-
-/**
- * udev_enumerate_new:
- * @udev: udev library context
- *
- * Create an enumeration context to scan /sys.
- *
- * Returns: an enumeration context.
- **/
-_public_ struct udev_enumerate *udev_enumerate_new(struct udev *udev)
-{
- struct udev_enumerate *udev_enumerate;
-
- if (udev == NULL)
- return NULL;
- udev_enumerate = new0(struct udev_enumerate, 1);
- if (udev_enumerate == NULL)
- return NULL;
- udev_enumerate->refcount = 1;
- udev_enumerate->udev = udev;
- udev_list_init(udev, &udev_enumerate->sysattr_match_list, false);
- udev_list_init(udev, &udev_enumerate->sysattr_nomatch_list, false);
- udev_list_init(udev, &udev_enumerate->subsystem_match_list, true);
- udev_list_init(udev, &udev_enumerate->subsystem_nomatch_list, true);
- udev_list_init(udev, &udev_enumerate->sysname_match_list, true);
- udev_list_init(udev, &udev_enumerate->properties_match_list, false);
- udev_list_init(udev, &udev_enumerate->tags_match_list, true);
- udev_list_init(udev, &udev_enumerate->devices_list, false);
- return udev_enumerate;
-}
-
-/**
- * udev_enumerate_ref:
- * @udev_enumerate: context
- *
- * Take a reference of a enumeration context.
- *
- * Returns: the passed enumeration context
- **/
-_public_ struct udev_enumerate *udev_enumerate_ref(struct udev_enumerate *udev_enumerate)
-{
- if (udev_enumerate == NULL)
- return NULL;
- udev_enumerate->refcount++;
- return udev_enumerate;
-}
-
-/**
- * udev_enumerate_unref:
- * @udev_enumerate: context
- *
- * Drop a reference of an enumeration context. If the refcount reaches zero,
- * all resources of the enumeration context will be released.
- *
- * Returns: #NULL
- **/
-_public_ struct udev_enumerate *udev_enumerate_unref(struct udev_enumerate *udev_enumerate)
-{
- unsigned int i;
-
- if (udev_enumerate == NULL)
- return NULL;
- udev_enumerate->refcount--;
- if (udev_enumerate->refcount > 0)
- return NULL;
- udev_list_cleanup(&udev_enumerate->sysattr_match_list);
- udev_list_cleanup(&udev_enumerate->sysattr_nomatch_list);
- udev_list_cleanup(&udev_enumerate->subsystem_match_list);
- udev_list_cleanup(&udev_enumerate->subsystem_nomatch_list);
- udev_list_cleanup(&udev_enumerate->sysname_match_list);
- udev_list_cleanup(&udev_enumerate->properties_match_list);
- udev_list_cleanup(&udev_enumerate->tags_match_list);
- udev_device_unref(udev_enumerate->parent_match);
- udev_list_cleanup(&udev_enumerate->devices_list);
- for (i = 0; i < udev_enumerate->devices_cur; i++)
- free(udev_enumerate->devices[i].syspath);
- free(udev_enumerate->devices);
- free(udev_enumerate);
- return NULL;
-}
-
-/**
- * udev_enumerate_get_udev:
- * @udev_enumerate: context
- *
- * Get the udev library context.
- *
- * Returns: a pointer to the context.
- */
-_public_ struct udev *udev_enumerate_get_udev(struct udev_enumerate *udev_enumerate)
-{
- if (udev_enumerate == NULL)
- return NULL;
- return udev_enumerate->udev;
-}
-
-static int syspath_add(struct udev_enumerate *udev_enumerate, const char *syspath)
-{
- char *path;
- struct syspath *entry;
-
- /* double array size if needed */
- if (udev_enumerate->devices_cur >= udev_enumerate->devices_max) {
- struct syspath *buf;
- unsigned int add;
-
- add = udev_enumerate->devices_max;
- if (add < 1024)
- add = 1024;
- buf = realloc(udev_enumerate->devices, (udev_enumerate->devices_max + add) * sizeof(struct syspath));
- if (buf == NULL)
- return -ENOMEM;
- udev_enumerate->devices = buf;
- udev_enumerate->devices_max += add;
- }
-
- path = strdup(syspath);
- if (path == NULL)
- return -ENOMEM;
- entry = &udev_enumerate->devices[udev_enumerate->devices_cur];
- entry->syspath = path;
- entry->len = strlen(path);
- udev_enumerate->devices_cur++;
- udev_enumerate->devices_uptodate = false;
- return 0;
-}
-
-static int syspath_cmp(const void *p1, const void *p2)
-{
- const struct syspath *path1 = p1;
- const struct syspath *path2 = p2;
- size_t len;
- int ret;
-
- len = MIN(path1->len, path2->len);
- ret = memcmp(path1->syspath, path2->syspath, len);
- if (ret == 0) {
- if (path1->len < path2->len)
- ret = -1;
- else if (path1->len > path2->len)
- ret = 1;
- }
- return ret;
-}
-
-/* For devices that should be moved to the absolute end of the list */
-static bool devices_delay_end(struct udev *udev, const char *syspath)
-{
- static const char *delay_device_list[] = {
- "/block/md",
- "/block/dm-",
- NULL
- };
- int i;
-
- for (i = 0; delay_device_list[i] != NULL; i++) {
- if (strstr(syspath + strlen("/sys"), delay_device_list[i]) != NULL)
- return true;
- }
- return false;
-}
-
-/* For devices that should just be moved a little bit later, just
- * before the point where some common path prefix changes. Returns the
- * number of characters that make up that common prefix */
-static size_t devices_delay_later(struct udev *udev, const char *syspath)
-{
- const char *c;
-
- /* For sound cards the control device must be enumerated last
- * to make sure it's the final device node that gets ACLs
- * applied. Applications rely on this fact and use ACL changes
- * on the control node as an indicator that the ACL change of
- * the entire sound card completed. The kernel makes this
- * guarantee when creating those devices, and hence we should
- * too when enumerating them. */
-
- if ((c = strstr(syspath, "/sound/card"))) {
- c += 11;
- c += strcspn(c, "/");
-
- if (startswith(c, "/controlC"))
- return c - syspath + 1;
- }
-
- return 0;
-}
-
-/**
- * udev_enumerate_get_list_entry:
- * @udev_enumerate: context
- *
- * Get the first entry of the sorted list of device paths.
- *
- * Returns: a udev_list_entry.
- */
-_public_ struct udev_list_entry *udev_enumerate_get_list_entry(struct udev_enumerate *udev_enumerate)
-{
- if (udev_enumerate == NULL)
- return NULL;
- if (!udev_enumerate->devices_uptodate) {
- unsigned int i;
- int move_later = -1;
- unsigned int max;
- struct syspath *prev = NULL;
- size_t move_later_prefix = 0;
-
- udev_list_cleanup(&udev_enumerate->devices_list);
- qsort_safe(udev_enumerate->devices, udev_enumerate->devices_cur, sizeof(struct syspath), syspath_cmp);
-
- max = udev_enumerate->devices_cur;
- for (i = 0; i < max; i++) {
- struct syspath *entry = &udev_enumerate->devices[i];
-
- /* skip duplicated entries */
- if (prev != NULL &&
- entry->len == prev->len &&
- memcmp(entry->syspath, prev->syspath, entry->len) == 0)
- continue;
- prev = entry;
-
- /* skip to be delayed devices, and add them to the end of the list */
- if (devices_delay_end(udev_enumerate->udev, entry->syspath)) {
- syspath_add(udev_enumerate, entry->syspath);
- /* need to update prev here for the case realloc() gives a different address */
- prev = &udev_enumerate->devices[i];
- continue;
- }
-
- /* skip to be delayed devices, and move the to
- * the point where the prefix changes. We can
- * only move one item at a time. */
- if (move_later == -1) {
- move_later_prefix = devices_delay_later(udev_enumerate->udev, entry->syspath);
-
- if (move_later_prefix > 0) {
- move_later = i;
- continue;
- }
- }
-
- if ((move_later >= 0) &&
- !strneq(entry->syspath, udev_enumerate->devices[move_later].syspath, move_later_prefix)) {
-
- udev_list_entry_add(&udev_enumerate->devices_list,
- udev_enumerate->devices[move_later].syspath, NULL);
- move_later = -1;
- }
-
- udev_list_entry_add(&udev_enumerate->devices_list, entry->syspath, NULL);
- }
-
- if (move_later >= 0)
- udev_list_entry_add(&udev_enumerate->devices_list,
- udev_enumerate->devices[move_later].syspath, NULL);
-
- /* add and cleanup delayed devices from end of list */
- for (i = max; i < udev_enumerate->devices_cur; i++) {
- struct syspath *entry = &udev_enumerate->devices[i];
-
- udev_list_entry_add(&udev_enumerate->devices_list, entry->syspath, NULL);
- free(entry->syspath);
- }
- udev_enumerate->devices_cur = max;
-
- udev_enumerate->devices_uptodate = true;
- }
- return udev_list_get_entry(&udev_enumerate->devices_list);
-}
-
-/**
- * udev_enumerate_add_match_subsystem:
- * @udev_enumerate: context
- * @subsystem: filter for a subsystem of the device to include in the list
- *
- * Match only devices belonging to a certain kernel subsystem.
- *
- * Returns: 0 on success, otherwise a negative error value.
- */
-_public_ int udev_enumerate_add_match_subsystem(struct udev_enumerate *udev_enumerate, const char *subsystem)
-{
- if (udev_enumerate == NULL)
- return -EINVAL;
- if (subsystem == NULL)
- return 0;
- if (udev_list_entry_add(&udev_enumerate->subsystem_match_list, subsystem, NULL) == NULL)
- return -ENOMEM;
- return 0;
-}
-
-/**
- * udev_enumerate_add_nomatch_subsystem:
- * @udev_enumerate: context
- * @subsystem: filter for a subsystem of the device to exclude from the list
- *
- * Match only devices not belonging to a certain kernel subsystem.
- *
- * Returns: 0 on success, otherwise a negative error value.
- */
-_public_ int udev_enumerate_add_nomatch_subsystem(struct udev_enumerate *udev_enumerate, const char *subsystem)
-{
- if (udev_enumerate == NULL)
- return -EINVAL;
- if (subsystem == NULL)
- return 0;
- if (udev_list_entry_add(&udev_enumerate->subsystem_nomatch_list, subsystem, NULL) == NULL)
- return -ENOMEM;
- return 0;
-}
-
-/**
- * udev_enumerate_add_match_sysattr:
- * @udev_enumerate: context
- * @sysattr: filter for a sys attribute at the device to include in the list
- * @value: optional value of the sys attribute
- *
- * Match only devices with a certain /sys device attribute.
- *
- * Returns: 0 on success, otherwise a negative error value.
- */
-_public_ int udev_enumerate_add_match_sysattr(struct udev_enumerate *udev_enumerate, const char *sysattr, const char *value)
-{
- if (udev_enumerate == NULL)
- return -EINVAL;
- if (sysattr == NULL)
- return 0;
- if (udev_list_entry_add(&udev_enumerate->sysattr_match_list, sysattr, value) == NULL)
- return -ENOMEM;
- return 0;
-}
-
-/**
- * udev_enumerate_add_nomatch_sysattr:
- * @udev_enumerate: context
- * @sysattr: filter for a sys attribute at the device to exclude from the list
- * @value: optional value of the sys attribute
- *
- * Match only devices not having a certain /sys device attribute.
- *
- * Returns: 0 on success, otherwise a negative error value.
- */
-_public_ int udev_enumerate_add_nomatch_sysattr(struct udev_enumerate *udev_enumerate, const char *sysattr, const char *value)
-{
- if (udev_enumerate == NULL)
- return -EINVAL;
- if (sysattr == NULL)
- return 0;
- if (udev_list_entry_add(&udev_enumerate->sysattr_nomatch_list, sysattr, value) == NULL)
- return -ENOMEM;
- return 0;
-}
-
-static int match_sysattr_value(struct udev_device *dev, const char *sysattr, const char *match_val)
-{
- const char *val = NULL;
- bool match = false;
-
- val = udev_device_get_sysattr_value(dev, sysattr);
- if (val == NULL)
- goto exit;
- if (match_val == NULL) {
- match = true;
- goto exit;
- }
- if (fnmatch(match_val, val, 0) == 0) {
- match = true;
- goto exit;
- }
-exit:
- return match;
-}
-
-/**
- * udev_enumerate_add_match_property:
- * @udev_enumerate: context
- * @property: filter for a property of the device to include in the list
- * @value: value of the property
- *
- * Match only devices with a certain property.
- *
- * Returns: 0 on success, otherwise a negative error value.
- */
-_public_ int udev_enumerate_add_match_property(struct udev_enumerate *udev_enumerate, const char *property, const char *value)
-{
- if (udev_enumerate == NULL)
- return -EINVAL;
- if (property == NULL)
- return 0;
- if (udev_list_entry_add(&udev_enumerate->properties_match_list, property, value) == NULL)
- return -ENOMEM;
- return 0;
-}
-
-/**
- * udev_enumerate_add_match_tag:
- * @udev_enumerate: context
- * @tag: filter for a tag of the device to include in the list
- *
- * Match only devices with a certain tag.
- *
- * Returns: 0 on success, otherwise a negative error value.
- */
-_public_ int udev_enumerate_add_match_tag(struct udev_enumerate *udev_enumerate, const char *tag)
-{
- if (udev_enumerate == NULL)
- return -EINVAL;
- if (tag == NULL)
- return 0;
- if (udev_list_entry_add(&udev_enumerate->tags_match_list, tag, NULL) == NULL)
- return -ENOMEM;
- return 0;
-}
-
-/**
- * udev_enumerate_add_match_parent:
- * @udev_enumerate: context
- * @parent: parent device where to start searching
- *
- * Return the devices on the subtree of one given device. The parent
- * itself is included in the list.
- *
- * A reference for the device is held until the udev_enumerate context
- * is cleaned up.
- *
- * Returns: 0 on success, otherwise a negative error value.
- */
-_public_ int udev_enumerate_add_match_parent(struct udev_enumerate *udev_enumerate, struct udev_device *parent)
-{
- if (udev_enumerate == NULL)
- return -EINVAL;
- if (parent == NULL)
- return 0;
- if (udev_enumerate->parent_match != NULL)
- udev_device_unref(udev_enumerate->parent_match);
- udev_enumerate->parent_match = udev_device_ref(parent);
- return 0;
-}
-
-/**
- * udev_enumerate_add_match_is_initialized:
- * @udev_enumerate: context
- *
- * Match only devices which udev has set up already. This makes
- * sure, that the device node permissions and context are properly set
- * and that network devices are fully renamed.
- *
- * Usually, devices which are found in the kernel but not already
- * handled by udev, have still pending events. Services should subscribe
- * to monitor events and wait for these devices to become ready, instead
- * of using uninitialized devices.
- *
- * For now, this will not affect devices which do not have a device node
- * and are not network interfaces.
- *
- * Returns: 0 on success, otherwise a negative error value.
- */
-_public_ int udev_enumerate_add_match_is_initialized(struct udev_enumerate *udev_enumerate)
-{
- if (udev_enumerate == NULL)
- return -EINVAL;
- udev_enumerate->match_is_initialized = true;
- return 0;
-}
-
-/**
- * udev_enumerate_add_match_sysname:
- * @udev_enumerate: context
- * @sysname: filter for the name of the device to include in the list
- *
- * Match only devices with a given /sys device name.
- *
- * Returns: 0 on success, otherwise a negative error value.
- */
-_public_ int udev_enumerate_add_match_sysname(struct udev_enumerate *udev_enumerate, const char *sysname)
-{
- if (udev_enumerate == NULL)
- return -EINVAL;
- if (sysname == NULL)
- return 0;
- if (udev_list_entry_add(&udev_enumerate->sysname_match_list, sysname, NULL) == NULL)
- return -ENOMEM;
- return 0;
-}
-
-static bool match_sysattr(struct udev_enumerate *udev_enumerate, struct udev_device *dev)
-{
- struct udev_list_entry *list_entry;
-
- /* skip list */
- udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->sysattr_nomatch_list)) {
- if (match_sysattr_value(dev, udev_list_entry_get_name(list_entry),
- udev_list_entry_get_value(list_entry)))
- return false;
- }
- /* include list */
- if (udev_list_get_entry(&udev_enumerate->sysattr_match_list) != NULL) {
- udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->sysattr_match_list)) {
- /* anything that does not match, will make it FALSE */
- if (!match_sysattr_value(dev, udev_list_entry_get_name(list_entry),
- udev_list_entry_get_value(list_entry)))
- return false;
- }
- return true;
- }
- return true;
-}
-
-static bool match_property(struct udev_enumerate *udev_enumerate, struct udev_device *dev)
-{
- struct udev_list_entry *list_entry;
- bool match = false;
-
- /* no match always matches */
- if (udev_list_get_entry(&udev_enumerate->properties_match_list) == NULL)
- return true;
-
- /* loop over matches */
- udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->properties_match_list)) {
- const char *match_key = udev_list_entry_get_name(list_entry);
- const char *match_value = udev_list_entry_get_value(list_entry);
- struct udev_list_entry *property_entry;
-
- /* loop over device properties */
- udev_list_entry_foreach(property_entry, udev_device_get_properties_list_entry(dev)) {
- const char *dev_key = udev_list_entry_get_name(property_entry);
- const char *dev_value = udev_list_entry_get_value(property_entry);
-
- if (fnmatch(match_key, dev_key, 0) != 0)
- continue;
- if (match_value == NULL && dev_value == NULL) {
- match = true;
- goto out;
- }
- if (match_value == NULL || dev_value == NULL)
- continue;
- if (fnmatch(match_value, dev_value, 0) == 0) {
- match = true;
- goto out;
- }
- }
- }
-out:
- return match;
-}
-
-static bool match_tag(struct udev_enumerate *udev_enumerate, struct udev_device *dev)
-{
- struct udev_list_entry *list_entry;
-
- /* no match always matches */
- if (udev_list_get_entry(&udev_enumerate->tags_match_list) == NULL)
- return true;
-
- /* loop over matches */
- udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->tags_match_list))
- if (!udev_device_has_tag(dev, udev_list_entry_get_name(list_entry)))
- return false;
-
- return true;
-}
-
-static bool match_parent(struct udev_enumerate *udev_enumerate, struct udev_device *dev)
-{
- if (udev_enumerate->parent_match == NULL)
- return true;
-
- return startswith(udev_device_get_devpath(dev), udev_device_get_devpath(udev_enumerate->parent_match));
-}
-
-static bool match_sysname(struct udev_enumerate *udev_enumerate, const char *sysname)
-{
- struct udev_list_entry *list_entry;
-
- if (udev_list_get_entry(&udev_enumerate->sysname_match_list) == NULL)
- return true;
-
- udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->sysname_match_list)) {
- if (fnmatch(udev_list_entry_get_name(list_entry), sysname, 0) != 0)
- continue;
- return true;
- }
- return false;
-}
-
-static int scan_dir_and_add_devices(struct udev_enumerate *udev_enumerate,
- const char *basedir, const char *subdir1, const char *subdir2)
-{
- char path[UTIL_PATH_SIZE];
- size_t l;
- char *s;
- DIR *dir;
- struct dirent *dent;
-
- s = path;
- l = strpcpyl(&s, sizeof(path), "/sys/", basedir, NULL);
- if (subdir1 != NULL)
- l = strpcpyl(&s, l, "/", subdir1, NULL);
- if (subdir2 != NULL)
- strpcpyl(&s, l, "/", subdir2, NULL);
- dir = opendir(path);
- if (dir == NULL)
- return -ENOENT;
- for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
- char syspath[UTIL_PATH_SIZE];
- struct udev_device *dev;
-
- if (dent->d_name[0] == '.')
- continue;
-
- if (!match_sysname(udev_enumerate, dent->d_name))
- continue;
-
- strscpyl(syspath, sizeof(syspath), path, "/", dent->d_name, NULL);
- dev = udev_device_new_from_syspath(udev_enumerate->udev, syspath);
- if (dev == NULL)
- continue;
-
- if (udev_enumerate->match_is_initialized) {
- /*
- * All devices with a device node or network interfaces
- * possibly need udev to adjust the device node permission
- * or context, or rename the interface before it can be
- * reliably used from other processes.
- *
- * For now, we can only check these types of devices, we
- * might not store a database, and have no way to find out
- * for all other types of devices.
- */
- if (!udev_device_get_is_initialized(dev) &&
- (major(udev_device_get_devnum(dev)) > 0 || udev_device_get_ifindex(dev) > 0))
- goto nomatch;
- }
- if (!match_parent(udev_enumerate, dev))
- goto nomatch;
- if (!match_tag(udev_enumerate, dev))
- goto nomatch;
- if (!match_property(udev_enumerate, dev))
- goto nomatch;
- if (!match_sysattr(udev_enumerate, dev))
- goto nomatch;
-
- syspath_add(udev_enumerate, udev_device_get_syspath(dev));
-nomatch:
- udev_device_unref(dev);
- }
- closedir(dir);
- return 0;
-}
-
-static bool match_subsystem(struct udev_enumerate *udev_enumerate, const char *subsystem)
-{
- struct udev_list_entry *list_entry;
-
- if (!subsystem)
- return false;
-
- udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->subsystem_nomatch_list)) {
- if (fnmatch(udev_list_entry_get_name(list_entry), subsystem, 0) == 0)
- return false;
- }
-
- if (udev_list_get_entry(&udev_enumerate->subsystem_match_list) != NULL) {
- udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->subsystem_match_list)) {
- if (fnmatch(udev_list_entry_get_name(list_entry), subsystem, 0) == 0)
- return true;
- }
- return false;
- }
-
- return true;
-}
-
-static int scan_dir(struct udev_enumerate *udev_enumerate, const char *basedir, const char *subdir, const char *subsystem)
-{
- char path[UTIL_PATH_SIZE];
- DIR *dir;
- struct dirent *dent;
-
- strscpyl(path, sizeof(path), "/sys/", basedir, NULL);
- dir = opendir(path);
- if (dir == NULL)
- return -1;
- for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
- if (dent->d_name[0] == '.')
- continue;
- if (!match_subsystem(udev_enumerate, subsystem != NULL ? subsystem : dent->d_name))
- continue;
- scan_dir_and_add_devices(udev_enumerate, basedir, dent->d_name, subdir);
- }
- closedir(dir);
- return 0;
-}
-
-/**
- * udev_enumerate_add_syspath:
- * @udev_enumerate: context
- * @syspath: path of a device
- *
- * Add a device to the list of devices, to retrieve it back sorted in dependency order.
- *
- * Returns: 0 on success, otherwise a negative error value.
- */
-_public_ int udev_enumerate_add_syspath(struct udev_enumerate *udev_enumerate, const char *syspath)
-{
- struct udev_device *udev_device;
-
- if (udev_enumerate == NULL)
- return -EINVAL;
- if (syspath == NULL)
- return 0;
- /* resolve to real syspath */
- udev_device = udev_device_new_from_syspath(udev_enumerate->udev, syspath);
- if (udev_device == NULL)
- return -EINVAL;
- syspath_add(udev_enumerate, udev_device_get_syspath(udev_device));
- udev_device_unref(udev_device);
- return 0;
-}
-
-static int scan_devices_tags(struct udev_enumerate *udev_enumerate)
-{
- struct udev_list_entry *list_entry;
-
- /* scan only tagged devices, use tags reverse-index, instead of searching all devices in /sys */
- udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->tags_match_list)) {
- DIR *dir;
- struct dirent *dent;
- char path[UTIL_PATH_SIZE];
-
- strscpyl(path, sizeof(path), "/run/udev/tags/", udev_list_entry_get_name(list_entry), NULL);
- dir = opendir(path);
- if (dir == NULL)
- continue;
- for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
- struct udev_device *dev;
-
- if (dent->d_name[0] == '.')
- continue;
-
- dev = udev_device_new_from_device_id(udev_enumerate->udev, dent->d_name);
- if (dev == NULL)
- continue;
-
- if (!match_subsystem(udev_enumerate, udev_device_get_subsystem(dev)))
- goto nomatch;
- if (!match_sysname(udev_enumerate, udev_device_get_sysname(dev)))
- goto nomatch;
- if (!match_parent(udev_enumerate, dev))
- goto nomatch;
- if (!match_property(udev_enumerate, dev))
- goto nomatch;
- if (!match_sysattr(udev_enumerate, dev))
- goto nomatch;
-
- syspath_add(udev_enumerate, udev_device_get_syspath(dev));
-nomatch:
- udev_device_unref(dev);
- }
- closedir(dir);
- }
- return 0;
-}
-
-static int parent_add_child(struct udev_enumerate *enumerate, const char *path)
-{
- struct udev_device *dev;
- int r = 0;
-
- dev = udev_device_new_from_syspath(enumerate->udev, path);
- if (dev == NULL)
- return -ENODEV;
-
- if (!match_subsystem(enumerate, udev_device_get_subsystem(dev)))
- goto nomatch;
- if (!match_sysname(enumerate, udev_device_get_sysname(dev)))
- goto nomatch;
- if (!match_property(enumerate, dev))
- goto nomatch;
- if (!match_sysattr(enumerate, dev))
- goto nomatch;
-
- syspath_add(enumerate, udev_device_get_syspath(dev));
- r = 1;
-
-nomatch:
- udev_device_unref(dev);
- return r;
-}
-
-static int parent_crawl_children(struct udev_enumerate *enumerate, const char *path, int maxdepth)
-{
- DIR *d;
- struct dirent *dent;
-
- d = opendir(path);
- if (d == NULL)
- return -errno;
-
- for (dent = readdir(d); dent != NULL; dent = readdir(d)) {
- char *child;
-
- if (dent->d_name[0] == '.')
- continue;
- if (dent->d_type != DT_DIR)
- continue;
- if (asprintf(&child, "%s/%s", path, dent->d_name) < 0)
- continue;
- parent_add_child(enumerate, child);
- if (maxdepth > 0)
- parent_crawl_children(enumerate, child, maxdepth-1);
- free(child);
- }
-
- closedir(d);
- return 0;
-}
-
-static int scan_devices_children(struct udev_enumerate *enumerate)
-{
- const char *path;
-
- path = udev_device_get_syspath(enumerate->parent_match);
- parent_add_child(enumerate, path);
- return parent_crawl_children(enumerate, path, 256);
-}
-
-static int scan_devices_all(struct udev_enumerate *udev_enumerate)
-{
- struct stat statbuf;
-
- if (stat("/sys/subsystem", &statbuf) == 0) {
- /* we have /subsystem/, forget all the old stuff */
- scan_dir(udev_enumerate, "subsystem", "devices", NULL);
- } else {
- scan_dir(udev_enumerate, "bus", "devices", NULL);
- scan_dir(udev_enumerate, "class", NULL, NULL);
- }
- return 0;
-}
-
-/**
- * udev_enumerate_scan_devices:
- * @udev_enumerate: udev enumeration context
- *
- * Scan /sys for all devices which match the given filters. No matches
- * will return all currently available devices.
- *
- * Returns: 0 on success, otherwise a negative error value.
- **/
-_public_ int udev_enumerate_scan_devices(struct udev_enumerate *udev_enumerate)
-{
- if (udev_enumerate == NULL)
- return -EINVAL;
-
- /* efficiently lookup tags only, we maintain a reverse-index */
- if (udev_list_get_entry(&udev_enumerate->tags_match_list) != NULL)
- return scan_devices_tags(udev_enumerate);
-
- /* walk the subtree of one parent device only */
- if (udev_enumerate->parent_match != NULL)
- return scan_devices_children(udev_enumerate);
-
- /* scan devices of all subsystems */
- return scan_devices_all(udev_enumerate);
-}
-
-/**
- * udev_enumerate_scan_subsystems:
- * @udev_enumerate: udev enumeration context
- *
- * Scan /sys for all kernel subsystems, including buses, classes, drivers.
- *
- * Returns: 0 on success, otherwise a negative error value.
- **/
-_public_ int udev_enumerate_scan_subsystems(struct udev_enumerate *udev_enumerate)
-{
- struct stat statbuf;
- const char *subsysdir;
-
- if (udev_enumerate == NULL)
- return -EINVAL;
-
- /* all kernel modules */
- if (match_subsystem(udev_enumerate, "module"))
- scan_dir_and_add_devices(udev_enumerate, "module", NULL, NULL);
-
- if (stat("/sys/subsystem", &statbuf) == 0)
- subsysdir = "subsystem";
- else
- subsysdir = "bus";
-
- /* all subsystems (only buses support coldplug) */
- if (match_subsystem(udev_enumerate, "subsystem"))
- scan_dir_and_add_devices(udev_enumerate, subsysdir, NULL, NULL);
-
- /* all subsystem drivers */
- if (match_subsystem(udev_enumerate, "drivers"))
- scan_dir(udev_enumerate, subsysdir, "drivers", "drivers");
- return 0;
-}
~ianmdlvl / elogind.git / blobdiff