1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
23 #include <sys/epoll.h>
31 static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = {
32 [DEVICE_DEAD] = UNIT_INACTIVE,
33 [DEVICE_AVAILABLE] = UNIT_ACTIVE
36 static const char* const state_string_table[_DEVICE_STATE_MAX] = {
37 [DEVICE_DEAD] = "dead",
38 [DEVICE_AVAILABLE] = "available"
41 static void device_done(Unit *u) {
42 Device *d = DEVICE(u);
48 static void device_set_state(Device *d, DeviceState state) {
49 DeviceState old_state;
52 if (state == d->state)
58 log_debug("%s changed %s → %s", unit_id(UNIT(d)), state_string_table[old_state], state_string_table[state]);
60 unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state]);
63 static int device_coldplug(Unit *u) {
64 Device *d = DEVICE(u);
67 assert(d->state == DEVICE_DEAD);
70 device_set_state(d, DEVICE_AVAILABLE);
75 static void device_dump(Unit *u, FILE *f, const char *prefix) {
76 Device *d = DEVICE(u);
81 "%sDevice State: %s\n"
83 prefix, state_string_table[d->state],
84 prefix, strna(d->sysfs));
87 static UnitActiveState device_active_state(Unit *u) {
90 return state_translation_table[DEVICE(u)->state];
93 static int device_add_escaped_name(Unit *u, const char *dn, bool make_id) {
101 if (!(e = unit_name_escape_path(dn+1, ".device")))
104 r = unit_add_name(u, e);
106 if (r >= 0 && make_id)
107 unit_choose_id(u, e);
111 if (r < 0 && r != -EEXIST)
117 static int device_find_escape_name(Manager *m, const char *dn, Unit **_u) {
123 assert(dn[0] == '/');
126 if (!(e = unit_name_escape_path(dn+1, ".device")))
129 u = manager_get_unit(m, e);
140 static int device_process_new_device(Manager *m, struct udev_device *dev, bool update_state) {
141 const char *dn, *names, *wants, *sysfs, *expose, *model;
147 struct udev_list_entry *item = NULL, *first = NULL;
151 if (!(sysfs = udev_device_get_syspath(dev)))
154 /* Check whether this entry is even relevant for us. */
155 dn = udev_device_get_devnode(dev);
156 expose = udev_device_get_property_value(dev, "SYSTEMD_EXPOSE");
157 names = udev_device_get_property_value(dev, "SYSTEMD_NAMES");
158 wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS");
163 if ((b = parse_boolean(expose)) < 0) {
164 log_error("Failed to parse SYSTEMD_EXPOSE udev property for device %s: %s", sysfs, expose);
171 if (!dn && !names && !wants)
174 /* Ok, seems kinda interesting. Now, let's see if this one
177 if ((r = device_find_escape_name(m, sysfs, &u)) < 0)
181 if ((r = device_find_escape_name(m, dn, &u)) < 0)
185 first = udev_device_get_devlinks_list_entry(dev);
186 udev_list_entry_foreach(item, first) {
187 if ((r = device_find_escape_name(m, udev_list_entry_get_name(item), &u)) < 0)
195 /* FIXME: this needs proper merging */
197 assert((r > 0) == !!u);
199 /* If this is a different unit, then let's not merge things */
200 if (u && DEVICE(u)->sysfs && !streq(DEVICE(u)->sysfs, sysfs))
206 if (!(u = unit_new(m)))
209 if ((r = device_add_escaped_name(u, sysfs, true)) < 0)
212 if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
217 unit_add_to_load_queue(u);
222 if ((r = device_add_escaped_name(u, dn, true)) < 0)
225 first = udev_device_get_devlinks_list_entry(dev);
226 udev_list_entry_foreach(item, first)
227 if ((r = device_add_escaped_name(u, udev_list_entry_get_name(item), false)) < 0)
230 if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) ||
231 (model = udev_device_get_property_value(dev, "ID_MODEL"))) {
232 if ((r = unit_set_description(u, model)) < 0)
235 if ((r = unit_set_description(u, dn)) < 0)
238 /* We don't remove names that are gone. But that should be
239 * fine and should probably be fixed only on a configuration
243 FOREACH_WORD(w, l, names, state) {
246 if (!(e = strndup(w, l))) {
251 r = unit_add_name(u, e);
254 if (r < 0 && r != -EEXIST)
260 FOREACH_WORD(w, l, wants, state) {
263 if (!(e = strndup(w, l))) {
268 r = unit_add_dependency_by_name(u, UNIT_WANTS, e);
277 manager_dispatch_load_queue(u->meta.manager);
278 device_set_state(DEVICE(u), DEVICE_AVAILABLE);
281 unit_add_to_dbus_queue(u);
291 static int device_process_path(Manager *m, const char *path, bool update_state) {
293 struct udev_device *dev;
298 if (!(dev = udev_device_new_from_syspath(m->udev, path))) {
299 log_warning("Failed to get udev device object from udev for path %s.", path);
303 r = device_process_new_device(m, dev, update_state);
304 udev_device_unref(dev);
308 static int device_process_removed_device(Manager *m, struct udev_device *dev) {
317 if (!(sysfs = udev_device_get_syspath(dev)))
320 assert(sysfs[0] == '/');
321 if (!(e = unit_name_escape_path(sysfs+1, ".device")))
324 u = manager_get_unit(m, e);
334 device_set_state(d, DEVICE_DEAD);
338 static void device_shutdown(Manager *m) {
342 udev_monitor_unref(m->udev_monitor);
348 static int device_enumerate(Manager *m) {
349 struct epoll_event ev;
351 struct udev_enumerate *e = NULL;
352 struct udev_list_entry *item = NULL, *first = NULL;
356 if (!(m->udev = udev_new()))
359 if (!(m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"))) {
364 if (udev_monitor_enable_receiving(m->udev_monitor) < 0) {
369 m->udev_watch.type = WATCH_UDEV;
370 m->udev_watch.fd = udev_monitor_get_fd(m->udev_monitor);
374 ev.data.ptr = &m->udev_watch;
376 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_watch.fd, &ev) < 0)
379 if (!(e = udev_enumerate_new(m->udev))) {
384 if (udev_enumerate_scan_devices(e) < 0) {
389 first = udev_enumerate_get_list_entry(e);
390 udev_list_entry_foreach(item, first)
391 device_process_path(m, udev_list_entry_get_name(item), false);
393 udev_enumerate_unref(e);
398 udev_enumerate_unref(e);
404 void device_fd_event(Manager *m, int events) {
405 struct udev_device *dev;
410 assert(events == EPOLLIN);
412 if (!(dev = udev_monitor_receive_device(m->udev_monitor))) {
413 log_error("Failed to receive device.");
417 if (!(action = udev_device_get_action(dev))) {
418 log_error("Failed to get udev action string.");
422 if (streq(action, "remove")) {
423 if ((r = device_process_removed_device(m, dev)) < 0) {
424 log_error("Failed to process udev device event: %s", strerror(-r));
428 if ((r = device_process_new_device(m, dev, true)) < 0) {
429 log_error("Failed to process udev device event: %s", strerror(-r));
435 udev_device_unref(dev);
438 const UnitVTable device_vtable = {
441 .init = unit_load_fragment_and_dropin_optional,
443 .coldplug = device_coldplug,
447 .active_state = device_active_state,
449 .enumerate = device_enumerate,
450 .shutdown = device_shutdown