/*
* 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
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;
struct syspath *devices;
unsigned int devices_cur;
unsigned int devices_max;
bool devices_uptodate:1;
+ bool match_is_initialized;
};
/**
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_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);
return ret;
}
-static int devices_delay(struct udev *udev, const char *syspath)
+/* 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",
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 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;
}
if (!udev_enumerate->devices_uptodate) {
unsigned int i;
unsigned int max;
- struct syspath *prev = NULL;
+ 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);
prev = entry;
/* skip to be delayed devices, and add them to the end of the list */
- if (devices_delay(udev_enumerate->udev, entry->syspath)) {
+ if (devices_delay_end(udev_enumerate->udev, entry->syspath)) {
syspath_add(udev_enumerate, entry->syspath);
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, 0);
+ move_later = NULL;
+ }
+
udev_list_entry_add(udev_enumerate->udev, &udev_enumerate->devices_list,
entry->syspath, NULL, 0, 0);
}
+
+ if (move_later)
+ udev_list_entry_add(udev_enumerate->udev, &udev_enumerate->devices_list,
+ move_later->syspath, NULL, 0, 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];
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;
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) {
goto exit;
}
exit:
- udev_device_unref(device);
return match;
}
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.
+ */
+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, 1, 0) == 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
return 0;
}
-static int match_sysattr(struct udev_enumerate *udev_enumerate, const char *syspath)
+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 = false;
+ 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)) {
}
}
out:
- udev_device_unref(dev);
return match;
}
-static int match_sysname(struct udev_enumerate *udev_enumerate, const char *sysname)
+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 1;
+ 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 1;
+ return true;
}
- return 0;
+ return false;
}
static int scan_dir_and_add_devices(struct udev_enumerate *udev_enumerate,
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;
+
if (!match_sysname(udev_enumerate, dent->d_name))
continue;
util_strscpyl(syspath, sizeof(syspath), path, "/", dent->d_name, NULL);
- if (lstat(syspath, &statbuf) != 0)
- continue;
- if (S_ISREG(statbuf.st_mode))
+ dev = udev_device_new_from_syspath(udev_enumerate->udev, syspath);
+ if (dev == NULL)
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))
- continue;
- if (!match_property(udev_enumerate, syspath))
- continue;
- syspath_add(udev_enumerate, syspath);
+ 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)
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_dev_path(udev), "/.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;
}
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