/*
* libudev - interface to udev device information
*
- * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
+ * 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
#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"
-static int devices_sort(struct udev_enumerate *udev_enumerate);
+/**
+ * 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_node sysattr_nomatch_list;
struct udev_list_node subsystem_match_list;
struct udev_list_node subsystem_nomatch_list;
+ struct udev_list_node sysname_match_list;
struct udev_list_node properties_match_list;
+ struct udev_list_node tags_match_list;
struct udev_list_node devices_list;
- int devices_sorted;
+ struct syspath *devices;
+ unsigned int devices_cur;
+ unsigned int devices_max;
+ bool devices_uptodate:1;
+ bool match_is_initialized;
};
/**
return NULL;
udev_enumerate->refcount = 1;
udev_enumerate->udev = udev;
- udev_list_init(&udev_enumerate->devices_list);
udev_list_init(&udev_enumerate->sysattr_match_list);
udev_list_init(&udev_enumerate->sysattr_nomatch_list);
udev_list_init(&udev_enumerate->subsystem_match_list);
udev_list_init(&udev_enumerate->subsystem_nomatch_list);
+ udev_list_init(&udev_enumerate->sysname_match_list);
udev_list_init(&udev_enumerate->properties_match_list);
+ udev_list_init(&udev_enumerate->tags_match_list);
+ udev_list_init(&udev_enumerate->devices_list);
return udev_enumerate;
}
+/**
+ * udev_enumerate_ref:
+ * @udev_enumerate: context
+ *
+ * Take a reference of a enumeration context.
+ *
+ * Returns: the passed enumeration context
+ **/
struct udev_enumerate *udev_enumerate_ref(struct udev_enumerate *udev_enumerate)
{
if (udev_enumerate == NULL)
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.
+ **/
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_entries(udev_enumerate->udev, &udev_enumerate->devices_list);
udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->sysattr_match_list);
udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->sysattr_nomatch_list);
udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->subsystem_match_list);
udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->subsystem_nomatch_list);
+ udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->sysname_match_list);
udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->properties_match_list);
+ udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->tags_match_list);
+ udev_list_cleanup_entries(udev_enumerate->udev, &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.
+ */
struct udev *udev_enumerate_get_udev(struct udev_enumerate *udev_enumerate)
{
if (udev_enumerate == 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) {
+ dbg(udev, "delaying: %s\n", syspath);
+ 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.
+ */
struct udev_list_entry *udev_enumerate_get_list_entry(struct udev_enumerate *udev_enumerate)
{
if (udev_enumerate == NULL)
return NULL;
- if (!udev_enumerate->devices_sorted)
- devices_sort(udev_enumerate);
+ 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_entries(udev_enumerate->udev, &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->udev, &udev_enumerate->devices_list,
+ move_later->syspath, NULL, 0);
+ move_later = NULL;
+ }
+
+ udev_list_entry_add(udev_enumerate->udev, &udev_enumerate->devices_list,
+ entry->syspath, NULL, 0);
+ }
+
+ if (move_later)
+ udev_list_entry_add(udev_enumerate->udev, &udev_enumerate->devices_list,
+ move_later->syspath, NULL, 0);
+
+ /* 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->udev, &udev_enumerate->devices_list,
+ entry->syspath, NULL, 0);
+ 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.
+ */
int udev_enumerate_add_match_subsystem(struct udev_enumerate *udev_enumerate, const char *subsystem)
{
if (udev_enumerate == NULL)
if (subsystem == NULL)
return 0;
if (udev_list_entry_add(udev_enumerate_get_udev(udev_enumerate),
- &udev_enumerate->subsystem_match_list, subsystem, NULL, 1, 0) == NULL)
+ &udev_enumerate->subsystem_match_list, subsystem, NULL, UDEV_LIST_UNIQUE) == 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.
+ */
int udev_enumerate_add_nomatch_subsystem(struct udev_enumerate *udev_enumerate, const char *subsystem)
{
if (udev_enumerate == NULL)
if (subsystem == NULL)
return 0;
if (udev_list_entry_add(udev_enumerate_get_udev(udev_enumerate),
- &udev_enumerate->subsystem_nomatch_list, subsystem, NULL, 1, 0) == NULL)
+ &udev_enumerate->subsystem_nomatch_list, subsystem, NULL, UDEV_LIST_UNIQUE) == 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.
+ */
int udev_enumerate_add_match_sysattr(struct udev_enumerate *udev_enumerate, const char *sysattr, const char *value)
{
if (udev_enumerate == NULL)
if (sysattr == NULL)
return 0;
if (udev_list_entry_add(udev_enumerate_get_udev(udev_enumerate),
- &udev_enumerate->sysattr_match_list, sysattr, value, 0, 0) == NULL)
+ &udev_enumerate->sysattr_match_list, sysattr, value, 0) == 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.
+ */
int udev_enumerate_add_nomatch_sysattr(struct udev_enumerate *udev_enumerate, const char *sysattr, const char *value)
{
if (udev_enumerate == NULL)
if (sysattr == NULL)
return 0;
if (udev_list_entry_add(udev_enumerate_get_udev(udev_enumerate),
- &udev_enumerate->sysattr_nomatch_list, sysattr, value, 0, 0) == NULL)
+ &udev_enumerate->sysattr_nomatch_list, sysattr, value, 0) == NULL)
return -ENOMEM;
return 0;
}
-static int match_sysattr_value(struct udev *udev, const char *syspath, const char *sysattr, const char *match_val)
+static int match_sysattr_value(struct udev_device *dev, const char *sysattr, const char *match_val)
{
- struct udev_device *device;
const char *val = NULL;
- int match = 0;
+ bool match = false;
- device = udev_device_new_from_syspath(udev, syspath);
- if (device == NULL)
- return -EINVAL;
- val = udev_device_get_sysattr_value(device, sysattr);
+ val = udev_device_get_sysattr_value(dev, sysattr);
if (val == NULL)
goto exit;
if (match_val == NULL) {
- match = 1;
+ match = true;
goto exit;
}
if (fnmatch(match_val, val, 0) == 0) {
- match = 1;
+ match = true;
goto exit;
}
exit:
- udev_device_unref(device);
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.
+ */
int udev_enumerate_add_match_property(struct udev_enumerate *udev_enumerate, const char *property, const char *value)
{
if (udev_enumerate == NULL)
if (property == NULL)
return 0;
if (udev_list_entry_add(udev_enumerate_get_udev(udev_enumerate),
- &udev_enumerate->properties_match_list, property, value, 0, 0) == NULL)
+ &udev_enumerate->properties_match_list, property, value, 0) == NULL)
return -ENOMEM;
return 0;
}
-static int match_sysattr(struct udev_enumerate *udev_enumerate, const char *syspath)
+/**
+ * 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.
+ */
+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_get_udev(udev_enumerate),
+ &udev_enumerate->tags_match_list, tag, NULL, UDEV_LIST_UNIQUE) == NULL)
+ return -ENOMEM;
+ 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.
+ */
+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.
+ */
+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_get_udev(udev_enumerate),
+ &udev_enumerate->sysname_match_list, sysname, NULL, UDEV_LIST_UNIQUE) == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+static bool match_sysattr(struct udev_enumerate *udev_enumerate, struct udev_device *dev)
{
- struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
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(udev, syspath,
- udev_list_entry_get_name(list_entry),
- udev_list_entry_get_value(list_entry)))
- return 0;
+ 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(udev, syspath,
- udev_list_entry_get_name(list_entry),
- udev_list_entry_get_value(list_entry)))
- return 0;
+ if (!match_sysattr_value(dev, udev_list_entry_get_name(list_entry),
+ udev_list_entry_get_value(list_entry)))
+ return false;
}
- return 1;
+ return true;
}
- return 1;
+ return true;
}
-static int match_property(struct udev_enumerate *udev_enumerate, const char *syspath)
+static bool match_property(struct udev_enumerate *udev_enumerate, struct udev_device *dev)
{
- struct udev_device *dev;
struct udev_list_entry *list_entry;
- int match = 0;
+ bool match = false;
/* no match always matches */
if (udev_list_get_entry(&udev_enumerate->properties_match_list) == NULL)
- return 1;
-
- /* no device does not match */
- dev = udev_device_new_from_syspath(udev_enumerate->udev, syspath);
- if (dev == NULL)
- return 0;
+ return true;
/* loop over matches */
udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->properties_match_list)) {
if (fnmatch(match_key, dev_key, 0) != 0)
continue;
if (match_value == NULL && dev_value == NULL) {
- match = 1;
+ match = true;
goto out;
}
if (match_value == NULL || dev_value == NULL)
continue;
if (fnmatch(match_value, dev_value, 0) == 0) {
- match = 1;
+ match = true;
goto out;
}
}
}
out:
- udev_device_unref(dev);
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_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)
{
if (subdir1 != NULL)
l = util_strpcpyl(&s, l, "/", subdir1, NULL);
if (subdir2 != NULL)
- l = util_strpcpyl(&s, l, "/", subdir2, NULL);
+ util_strpcpyl(&s, l, "/", subdir2, NULL);
dir = opendir(path);
if (dir == NULL)
- return -1;
+ return -ENOENT;
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
char syspath[UTIL_PATH_SIZE];
- char filename[UTIL_PATH_SIZE];
- struct stat statbuf;
+ struct udev_device *dev;
if (dent->d_name[0] == '.')
continue;
- util_strscpyl(syspath, sizeof(syspath), path, "/", dent->d_name, NULL);
- if (lstat(syspath, &statbuf) != 0)
- continue;
- if (S_ISREG(statbuf.st_mode))
- continue;
- if (S_ISLNK(statbuf.st_mode))
- util_resolve_sys_link(udev, syspath, sizeof(syspath));
- util_strscpyl(filename, sizeof(filename), syspath, "/uevent", NULL);
- if (stat(filename, &statbuf) != 0)
- continue;
- if (!match_sysattr(udev_enumerate, syspath))
+ if (!match_sysname(udev_enumerate, dent->d_name))
continue;
- if (!match_property(udev_enumerate, syspath))
+
+ util_strscpyl(syspath, sizeof(syspath), path, "/", dent->d_name, NULL);
+ dev = udev_device_new_from_syspath(udev_enumerate->udev, syspath);
+ if (dev == NULL)
continue;
- udev_list_entry_add(udev, &udev_enumerate->devices_list, syspath, NULL, 1, 1);
+
+ 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_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 int match_subsystem(struct udev_enumerate *udev_enumerate, const char *subsystem)
+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 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 1;
+ return true;
}
- return 0;
+ return false;
}
- return 1;
+ return true;
}
static int scan_dir(struct udev_enumerate *udev_enumerate, const char *basedir, const char *subdir, const char *subsystem)
return 0;
}
-static int devices_delay(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) {
- dbg(udev, "delaying: %s\n", syspath);
- return 1;
- }
- }
- return 0;
-}
-
-/* sort delayed devices to the end of the list */
-static int devices_sort(struct udev_enumerate *udev_enumerate)
-{
- struct udev_list_entry *entry_loop;
- struct udev_list_entry *entry_tmp;
- struct udev_list_node devices_list;
-
- udev_list_init(&devices_list);
- /* move delayed to delay list */
- udev_list_entry_foreach_safe(entry_loop, entry_tmp, udev_list_get_entry(&udev_enumerate->devices_list)) {
- if (devices_delay(udev_enumerate->udev, udev_list_entry_get_name(entry_loop))) {
- udev_list_entry_remove(entry_loop);
- udev_list_entry_append(entry_loop, &devices_list);
- }
- }
- /* move delayed back to end of list */
- udev_list_entry_foreach_safe(entry_loop, entry_tmp, udev_list_get_entry(&devices_list)) {
- udev_list_entry_remove(entry_loop);
- udev_list_entry_append(entry_loop, &udev_enumerate->devices_list);
- }
- udev_enumerate->devices_sorted = 1;
- 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.
+ */
int udev_enumerate_add_syspath(struct udev_enumerate *udev_enumerate, const char *syspath)
{
- struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
struct udev_device *udev_device;
if (udev_enumerate == NULL)
udev_device = udev_device_new_from_syspath(udev_enumerate->udev, syspath);
if (udev_device == NULL)
return -EINVAL;
- udev_list_entry_add(udev, &udev_enumerate->devices_list,
- udev_device_get_syspath(udev_device), NULL, 1, 1);
+ syspath_add(udev_enumerate, udev_device_get_syspath(udev_device));
udev_device_unref(udev_device);
return 0;
}
* udev_enumerate_scan_devices:
* @udev_enumerate: udev enumeration context
*
- * Returns: a negative value on error.
+ * Returns: 0 on success, otherwise a negative error value.
**/
int udev_enumerate_scan_devices(struct udev_enumerate *udev_enumerate)
{
if (udev_enumerate == NULL)
return -EINVAL;
- 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 */
- dbg(udev, "searching '/subsystem/*/devices/*' dir\n");
- scan_dir(udev_enumerate, "subsystem", "devices", NULL);
+
+ if (udev_list_get_entry(&udev_enumerate->tags_match_list) != NULL) {
+ 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;
+ syspath_add(udev_enumerate, udev_device_get_syspath(dev));
+ udev_device_unref(dev);
+ }
+ closedir(dir);
+ }
} else {
+ 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 */
+ dbg(udev, "searching '/subsystem/*/devices/*' dir\n");
+ scan_dir(udev_enumerate, "subsystem", "devices", NULL);
+ } else {
dbg(udev, "searching '/bus/*/devices/*' dir\n");
- scan_dir(udev_enumerate, "bus", "devices", NULL);
- dbg(udev, "searching '/class/*' dir\n");
- scan_dir(udev_enumerate, "class", NULL, NULL);
- /* if block isn't a class, scan /block/ */
- util_strscpyl(base, sizeof(base), udev_get_sys_path(udev), "/class/block", NULL);
- if (stat(base, &statbuf) != 0) {
- if (match_subsystem(udev_enumerate, "block")) {
- dbg(udev, "searching '/block/*' dir\n");
- /* scan disks */
- scan_dir_and_add_devices(udev_enumerate, "block", NULL, NULL);
- /* scan partitions */
- dbg(udev, "searching '/block/*/*' dir\n");
- scan_dir(udev_enumerate, "block", NULL, "block");
- }
+ scan_dir(udev_enumerate, "bus", "devices", NULL);
+ dbg(udev, "searching '/class/*' dir\n");
+ scan_dir(udev_enumerate, "class", NULL, NULL);
}
}
+
return 0;
}
* udev_enumerate_scan_subsystems:
* @udev_enumerate: udev enumeration context
*
- * Returns: a negative value on error.
+ * Returns: 0 on success, otherwise a negative error value.
**/
int udev_enumerate_scan_subsystems(struct udev_enumerate *udev_enumerate)
{
if (udev_enumerate == NULL)
return -EINVAL;
+
util_strscpyl(base, sizeof(base), udev_get_sys_path(udev), "/subsystem", NULL);
if (stat(base, &statbuf) == 0)
subsysdir = "subsystem";
~ianmdlvl / elogind.git / blobdiff