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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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#include <sys/epoll.h>
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#include "unit-name.h"
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#include "dbus-device.h"
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static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = {
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[DEVICE_DEAD] = UNIT_INACTIVE,
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[DEVICE_PLUGGED] = UNIT_ACTIVE
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static void device_unset_sysfs(Device *d) {
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/* Remove this unit from the chain of devices which share the
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first = hashmap_get(UNIT(d)->manager->devices_by_sysfs, d->sysfs);
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LIST_REMOVE(Device, same_sysfs, first, d);
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hashmap_remove_and_replace(UNIT(d)->manager->devices_by_sysfs, d->sysfs, first->sysfs, first);
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hashmap_remove(UNIT(d)->manager->devices_by_sysfs, d->sysfs);
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static void device_init(Unit *u) {
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Device *d = DEVICE(u);
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assert(UNIT(d)->load_state == UNIT_STUB);
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/* In contrast to all other unit types we timeout jobs waiting
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* for devices by default. This is because they otherwise wait
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* indefinitely for plugged in devices, something which cannot
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* happen for the other units since their operations time out
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UNIT(d)->job_timeout = DEFAULT_TIMEOUT_USEC;
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UNIT(d)->ignore_on_isolate = true;
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UNIT(d)->ignore_on_snapshot = true;
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static void device_done(Unit *u) {
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Device *d = DEVICE(u);
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device_unset_sysfs(d);
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static void device_set_state(Device *d, DeviceState state) {
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DeviceState old_state;
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if (state != old_state)
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log_debug("%s changed %s -> %s",
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device_state_to_string(old_state),
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device_state_to_string(state));
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unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state], true);
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static int device_coldplug(Unit *u) {
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Device *d = DEVICE(u);
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assert(d->state == DEVICE_DEAD);
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device_set_state(d, DEVICE_PLUGGED);
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static void device_dump(Unit *u, FILE *f, const char *prefix) {
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Device *d = DEVICE(u);
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"%sDevice State: %s\n"
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"%sSysfs Path: %s\n",
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prefix, device_state_to_string(d->state),
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prefix, strna(d->sysfs));
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static UnitActiveState device_active_state(Unit *u) {
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return state_translation_table[DEVICE(u)->state];
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static const char *device_sub_state_to_string(Unit *u) {
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return device_state_to_string(DEVICE(u)->state);
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static int device_add_escaped_name(Unit *u, const char *dn) {
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assert(dn[0] == '/');
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if (!(e = unit_name_from_path(dn, ".device")))
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r = unit_add_name(u, e);
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if (r < 0 && r != -EEXIST)
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static int device_find_escape_name(Manager *m, const char *dn, Unit **_u) {
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assert(dn[0] == '/');
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if (!(e = unit_name_from_path(dn, ".device")))
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u = manager_get_unit(m, e);
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static int device_update_unit(Manager *m, struct udev_device *dev, const char *path, bool main) {
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const char *sysfs, *model;
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if (!(sysfs = udev_device_get_syspath(dev)))
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if ((r = device_find_escape_name(m, path, &u)) < 0)
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if (u && DEVICE(u)->sysfs && !path_equal(DEVICE(u)->sysfs, sysfs))
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u = unit_new(m, sizeof(Device));
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r = device_add_escaped_name(u, path);
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unit_add_to_load_queue(u);
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/* If this was created via some dependency and has not
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* actually been seen yet ->sysfs will not be
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* initialized. Hence initialize it if necessary. */
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if (!DEVICE(u)->sysfs) {
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if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
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if (!m->devices_by_sysfs)
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if (!(m->devices_by_sysfs = hashmap_new(string_hash_func, string_compare_func))) {
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first = hashmap_get(m->devices_by_sysfs, sysfs);
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LIST_PREPEND(Device, same_sysfs, first, DEVICE(u));
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if ((r = hashmap_replace(m->devices_by_sysfs, DEVICE(u)->sysfs, first)) < 0)
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if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) ||
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(model = udev_device_get_property_value(dev, "ID_MODEL"))) {
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if ((r = unit_set_description(u, model)) < 0)
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if ((r = unit_set_description(u, path)) < 0)
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/* The additional systemd udev properties we only
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* interpret for the main object */
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const char *wants, *alias;
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if ((alias = udev_device_get_property_value(dev, "SYSTEMD_ALIAS"))) {
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log_warning("SYSTEMD_ALIAS for %s is not a path, ignoring: %s", sysfs, alias);
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if ((r = device_add_escaped_name(u, alias)) < 0)
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if ((wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS"))) {
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FOREACH_WORD_QUOTED(w, l, wants, state) {
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if (!(e = strndup(w, l))) {
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r = unit_add_dependency_by_name(u, UNIT_WANTS, e, NULL, true);
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unit_add_to_dbus_queue(u);
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log_warning("Failed to load device unit: %s", strerror(-r));
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static int device_process_new_device(Manager *m, struct udev_device *dev, bool update_state) {
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const char *sysfs, *dn;
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struct udev_list_entry *item = NULL, *first = NULL;
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if (!(sysfs = udev_device_get_syspath(dev)))
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/* Add the main unit named after the sysfs path */
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device_update_unit(m, dev, sysfs, true);
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/* Add an additional unit for the device node */
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if ((dn = udev_device_get_devnode(dev)))
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device_update_unit(m, dev, dn, false);
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/* Add additional units for all symlinks */
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first = udev_device_get_devlinks_list_entry(dev);
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udev_list_entry_foreach(item, first) {
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/* Don't bother with the /dev/block links */
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p = udev_list_entry_get_name(item);
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if (path_startswith(p, "/dev/block/") ||
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path_startswith(p, "/dev/char/"))
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/* Verify that the symlink in the FS actually belongs
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* to this device. This is useful to deal with
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* conflicting devices, e.g. when two disks want the
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* same /dev/disk/by-label/xxx link because they have
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* the same label. We want to make sure that the same
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* device that won the symlink wins in systemd, so we
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* check the device node major/minor*/
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if (stat(p, &st) >= 0)
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if ((!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) ||
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st.st_rdev != udev_device_get_devnum(dev))
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device_update_unit(m, dev, p, false);
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manager_dispatch_load_queue(m);
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l = hashmap_get(m->devices_by_sysfs, sysfs);
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LIST_FOREACH(same_sysfs, d, l)
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device_set_state(d, DEVICE_PLUGGED);
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static int device_process_path(Manager *m, const char *path, bool update_state) {
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struct udev_device *dev;
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if (!(dev = udev_device_new_from_syspath(m->udev, path))) {
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log_warning("Failed to get udev device object from udev for path %s.", path);
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r = device_process_new_device(m, dev, update_state);
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udev_device_unref(dev);
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static int device_process_removed_device(Manager *m, struct udev_device *dev) {
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if (!(sysfs = udev_device_get_syspath(dev)))
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/* Remove all units of this sysfs path */
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while ((d = hashmap_get(m->devices_by_sysfs, sysfs))) {
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device_unset_sysfs(d);
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device_set_state(d, DEVICE_DEAD);
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static Unit *device_following(Unit *u) {
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Device *d = DEVICE(u);
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Device *other, *first = NULL;
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if (startswith(u->id, "sys-"))
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/* Make everybody follow the unit that's named after the sysfs path */
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for (other = d->same_sysfs_next; other; other = other->same_sysfs_next)
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if (startswith(UNIT(other)->id, "sys-"))
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for (other = d->same_sysfs_prev; other; other = other->same_sysfs_prev) {
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if (startswith(UNIT(other)->id, "sys-"))
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static int device_following_set(Unit *u, Set **_s) {
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Device *d = DEVICE(u);
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if (!d->same_sysfs_prev && !d->same_sysfs_next) {
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if (!(s = set_new(NULL, NULL)))
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for (other = d->same_sysfs_next; other; other = other->same_sysfs_next)
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if ((r = set_put(s, other)) < 0)
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for (other = d->same_sysfs_prev; other; other = other->same_sysfs_prev)
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if ((r = set_put(s, other)) < 0)
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static void device_shutdown(Manager *m) {
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if (m->udev_monitor) {
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udev_monitor_unref(m->udev_monitor);
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m->udev_monitor = NULL;
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hashmap_free(m->devices_by_sysfs);
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m->devices_by_sysfs = NULL;
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static int device_enumerate(Manager *m) {
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struct epoll_event ev;
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struct udev_enumerate *e = NULL;
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struct udev_list_entry *item = NULL, *first = NULL;
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if (!(m->udev = udev_new()))
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if (!(m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"))) {
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/* This will fail if we are unprivileged, but that
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* should not matter much, as user instances won't run
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udev_monitor_set_receive_buffer_size(m->udev_monitor, 128*1024*1024);
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if (udev_monitor_filter_add_match_tag(m->udev_monitor, "systemd") < 0) {
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if (udev_monitor_enable_receiving(m->udev_monitor) < 0) {
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m->udev_watch.type = WATCH_UDEV;
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m->udev_watch.fd = udev_monitor_get_fd(m->udev_monitor);
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ev.data.ptr = &m->udev_watch;
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if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_watch.fd, &ev) < 0)
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if (!(e = udev_enumerate_new(m->udev))) {
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if (udev_enumerate_add_match_tag(e, "systemd") < 0) {
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if (udev_enumerate_scan_devices(e) < 0) {
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first = udev_enumerate_get_list_entry(e);
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udev_list_entry_foreach(item, first)
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device_process_path(m, udev_list_entry_get_name(item), false);
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udev_enumerate_unref(e);
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udev_enumerate_unref(e);
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void device_fd_event(Manager *m, int events) {
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struct udev_device *dev;
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const char *action, *ready;
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if (events != EPOLLIN) {
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static RATELIMIT_DEFINE(limit, 10*USEC_PER_SEC, 5);
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if (!ratelimit_test(&limit))
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log_error("Failed to get udev event: %m");
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if (!(events & EPOLLIN))
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if (!(dev = udev_monitor_receive_device(m->udev_monitor))) {
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* libudev might filter-out devices which pass the bloom filter,
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* so getting NULL here is not necessarily an error
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if (!(action = udev_device_get_action(dev))) {
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log_error("Failed to get udev action string.");
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ready = udev_device_get_property_value(dev, "SYSTEMD_READY");
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if (streq(action, "remove") || (ready && parse_boolean(ready) == 0)) {
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if ((r = device_process_removed_device(m, dev)) < 0) {
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log_error("Failed to process udev device event: %s", strerror(-r));
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if ((r = device_process_new_device(m, dev, true)) < 0) {
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log_error("Failed to process udev device event: %s", strerror(-r));
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udev_device_unref(dev);
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static const char* const device_state_table[_DEVICE_STATE_MAX] = {
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[DEVICE_DEAD] = "dead",
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[DEVICE_PLUGGED] = "plugged"
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DEFINE_STRING_TABLE_LOOKUP(device_state, DeviceState);
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const UnitVTable device_vtable = {
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.object_size = sizeof(Device),
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.no_instances = true,
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.load = unit_load_fragment_and_dropin_optional,
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.coldplug = device_coldplug,
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.active_state = device_active_state,
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.sub_state_to_string = device_sub_state_to_string,
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.bus_interface = "org.freedesktop.systemd1.Device",
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.bus_message_handler = bus_device_message_handler,
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.bus_invalidating_properties = bus_device_invalidating_properties,
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.following = device_following,
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.following_set = device_following_set,
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.enumerate = device_enumerate,
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.shutdown = device_shutdown
added
removed
src/device.c
