diff options
Diffstat (limited to 'src/udev/libudev-enumerate.c')
| -rw-r--r-- | src/udev/libudev-enumerate.c | 936 |
1 files changed, 0 insertions, 936 deletions
diff --git a/src/udev/libudev-enumerate.c b/src/udev/libudev-enumerate.c deleted file mode 100644 index 7b9a732ce6..0000000000 --- a/src/udev/libudev-enumerate.c +++ /dev/null @@ -1,936 +0,0 @@ -/* - * libudev - interface to udev device information - * - * Copyright (C) 2008-2010 Kay Sievers <kay.sievers@vrfy.org> - * - * This library 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. - */ - -#include <stdio.h> -#include <stdlib.h> -#include <stddef.h> -#include <unistd.h> -#include <errno.h> -#include <string.h> -#include <dirent.h> -#include <fnmatch.h> -#include <stdbool.h> -#include <sys/stat.h> -#include <sys/param.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 - * - * Returns: an enumeration context - **/ -_public_ struct udev_enumerate *udev_enumerate_new(struct udev *udev) -{ - struct udev_enumerate *udev_enumerate; - - udev_enumerate = calloc(1, sizeof(struct udev_enumerate)); - 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. - **/ -_public_ void udev_enumerate_unref(struct udev_enumerate *udev_enumerate) -{ - unsigned int i; - - if (udev_enumerate == NULL) - return; - udev_enumerate->refcount--; - if (udev_enumerate->refcount > 0) - return; - 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); -} - -/** - * udev_enumerate_get_udev: - * @udev_enumerate: context - * - * Returns: the udev library 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 - }; - size_t len; - int i; - - len = strlen(udev_get_sys_path(udev)); - for (i = 0; delay_device_list[i] != NULL; i++) { - if (strstr(&syspath[len], 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 (strncmp(c, "/controlC", 9) == 0) - return c - syspath + 1; - } - - return 0; -} - -/** - * udev_enumerate_get_list_entry: - * @udev_enumerate: context - * - * Returns: the first entry of the sorted list of device paths. - */ -_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; - unsigned int max; - struct syspath *prev = NULL, *move_later = NULL; - size_t move_later_prefix = 0; - - udev_list_cleanup(&udev_enumerate->devices_list); - qsort(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) { - move_later_prefix = devices_delay_later(udev_enumerate->udev, entry->syspath); - - if (move_later_prefix > 0) { - move_later = entry; - continue; - } - } - - if (move_later && - strncmp(entry->syspath, move_later->syspath, move_later_prefix) != 0) { - - udev_list_entry_add(&udev_enumerate->devices_list, move_later->syspath, NULL); - move_later = NULL; - } - - udev_list_entry_add(&udev_enumerate->devices_list, entry->syspath, NULL); - } - - if (move_later) - udev_list_entry_add(&udev_enumerate->devices_list, 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 - * - * 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 - * - * 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 - * - * 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 - * - * 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 - * - * 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 - * - * 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 - * - * 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) -{ - const char *parent; - - if (udev_enumerate->parent_match == NULL) - return true; - - parent = udev_device_get_devpath(udev_enumerate->parent_match); - return strncmp(parent, udev_device_get_devpath(dev), strlen(parent)) == 0; -} - -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) -{ - struct udev *udev = udev_enumerate_get_udev(udev_enumerate); - char path[UTIL_PATH_SIZE]; - size_t l; - char *s; - DIR *dir; - struct dirent *dent; - - s = path; - l = util_strpcpyl(&s, sizeof(path), udev_get_sys_path(udev), "/", basedir, NULL); - if (subdir1 != NULL) - l = util_strpcpyl(&s, l, "/", subdir1, NULL); - if (subdir2 != NULL) - util_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; - - util_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; - - 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) -{ - struct udev *udev = udev_enumerate_get_udev(udev_enumerate); - - char path[UTIL_PATH_SIZE]; - DIR *dir; - struct dirent *dent; - - util_strscpyl(path, sizeof(path), udev_get_sys_path(udev), "/", 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 *udev = udev_enumerate_get_udev(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]; - - util_strscpyl(path, sizeof(path), udev_get_run_path(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_id_filename(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; - - dev = udev_device_new_from_syspath(enumerate->udev, path); - if (dev == NULL) - return -ENODEV; - - if (!match_subsystem(enumerate, udev_device_get_subsystem(dev))) - return 0; - if (!match_sysname(enumerate, udev_device_get_sysname(dev))) - return 0; - if (!match_property(enumerate, dev)) - return 0; - if (!match_sysattr(enumerate, dev)) - return 0; - - syspath_add(enumerate, udev_device_get_syspath(dev)); - udev_device_unref(dev); - return 1; -} - -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 udev *udev = udev_enumerate_get_udev(udev_enumerate); - char base[UTIL_PATH_SIZE]; - struct stat statbuf; - - util_strscpyl(base, sizeof(base), udev_get_sys_path(udev), "/subsystem", NULL); - if (stat(base, &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 - * - * 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 - * - * Returns: 0 on success, otherwise a negative error value. - **/ -_public_ int udev_enumerate_scan_subsystems(struct udev_enumerate *udev_enumerate) -{ - struct udev *udev = udev_enumerate_get_udev(udev_enumerate); - char base[UTIL_PATH_SIZE]; - 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); - - util_strscpyl(base, sizeof(base), udev_get_sys_path(udev), "/subsystem", NULL); - if (stat(base, &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; -} |