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>
30 #include "unit-name.h"
31 #include "dbus-device.h"
33 static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = {
34 [DEVICE_DEAD] = UNIT_INACTIVE,
35 [DEVICE_AVAILABLE] = UNIT_ACTIVE
38 static const char* const state_string_table[_DEVICE_STATE_MAX] = {
39 [DEVICE_DEAD] = "dead",
40 [DEVICE_AVAILABLE] = "available"
43 static void device_done(Unit *u) {
44 Device *d = DEVICE(u);
52 static void device_init(Unit *u) {
53 Device *d = DEVICE(u);
56 assert(u->meta.load_state == UNIT_STUB);
61 static void device_set_state(Device *d, DeviceState state) {
62 DeviceState old_state;
68 if (state != old_state)
69 log_debug("%s changed %s → %s", UNIT(d)->meta.id, state_string_table[old_state], state_string_table[state]);
71 unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state]);
74 static int device_coldplug(Unit *u) {
75 Device *d = DEVICE(u);
78 assert(d->state == DEVICE_DEAD);
81 device_set_state(d, DEVICE_AVAILABLE);
86 static void device_dump(Unit *u, FILE *f, const char *prefix) {
87 Device *d = DEVICE(u);
92 "%sDevice State: %s\n"
94 prefix, state_string_table[d->state],
95 prefix, strna(d->sysfs));
98 static UnitActiveState device_active_state(Unit *u) {
101 return state_translation_table[DEVICE(u)->state];
104 static const char *device_sub_state_to_string(Unit *u) {
107 return state_string_table[DEVICE(u)->state];
110 static int device_add_escaped_name(Unit *u, const char *dn, bool make_id) {
116 assert(dn[0] == '/');
118 if (!(e = unit_name_build_escape(dn+1, NULL, ".device")))
121 r = unit_add_name(u, e);
123 if (r >= 0 && make_id)
124 unit_choose_id(u, e);
128 if (r < 0 && r != -EEXIST)
134 static int device_find_escape_name(Manager *m, const char *dn, Unit **_u) {
140 assert(dn[0] == '/');
143 if (!(e = unit_name_build_escape(dn+1, NULL, ".device")))
146 u = manager_get_unit(m, e);
157 static int device_process_new_device(Manager *m, struct udev_device *dev, bool update_state) {
158 const char *dn, *wants, *sysfs, *expose, *model;
164 struct udev_list_entry *item = NULL, *first = NULL;
169 if (!(sysfs = udev_device_get_syspath(dev)))
172 if (!(expose = udev_device_get_property_value(dev, "SYSTEMD_EXPOSE")))
175 if ((b = parse_boolean(expose)) < 0) {
176 log_error("Failed to parse SYSTEMD_EXPOSE udev property for device %s: %s", sysfs, expose);
183 /* Check whether this entry is even relevant for us. */
184 dn = udev_device_get_devnode(dev);
185 wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS");
187 if ((r = device_find_escape_name(m, sysfs, &u)) < 0)
191 if ((r = device_find_escape_name(m, dn, &u)) < 0)
195 first = udev_device_get_devlinks_list_entry(dev);
196 udev_list_entry_foreach(item, first) {
197 if ((r = device_find_escape_name(m, udev_list_entry_get_name(item), &u)) < 0)
205 /* FIXME: this needs proper merging */
207 assert((r > 0) == !!u);
209 /* If this is a different unit, then let's not merge things */
210 if (u && DEVICE(u)->sysfs && !streq(DEVICE(u)->sysfs, sysfs))
216 if (!(u = unit_new(m)))
219 if ((r = device_add_escaped_name(u, sysfs, true)) < 0)
222 unit_add_to_load_queue(u);
226 if (!(DEVICE(u)->sysfs))
227 if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
233 if ((r = device_add_escaped_name(u, dn, true)) < 0)
236 first = udev_device_get_devlinks_list_entry(dev);
237 udev_list_entry_foreach(item, first)
238 if ((r = device_add_escaped_name(u, udev_list_entry_get_name(item), false)) < 0)
241 if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) ||
242 (model = udev_device_get_property_value(dev, "ID_MODEL"))) {
243 if ((r = unit_set_description(u, model)) < 0)
246 if ((r = unit_set_description(u, dn)) < 0)
250 FOREACH_WORD(w, l, wants, state) {
253 if (!(e = strndup(w, l))) {
258 r = unit_add_dependency_by_name(u, UNIT_WANTS, NULL, e);
267 manager_dispatch_load_queue(u->meta.manager);
268 device_set_state(DEVICE(u), DEVICE_AVAILABLE);
271 unit_add_to_dbus_queue(u);
281 static int device_process_path(Manager *m, const char *path, bool update_state) {
283 struct udev_device *dev;
288 if (!(dev = udev_device_new_from_syspath(m->udev, path))) {
289 log_warning("Failed to get udev device object from udev for path %s.", path);
293 r = device_process_new_device(m, dev, update_state);
294 udev_device_unref(dev);
298 static int device_process_removed_device(Manager *m, struct udev_device *dev) {
307 if (!(sysfs = udev_device_get_syspath(dev)))
310 assert(sysfs[0] == '/');
311 if (!(e = unit_name_build_escape(sysfs+1, NULL, ".device")))
314 u = manager_get_unit(m, e);
324 device_set_state(d, DEVICE_DEAD);
328 static void device_shutdown(Manager *m) {
332 udev_monitor_unref(m->udev_monitor);
338 static int device_enumerate(Manager *m) {
339 struct epoll_event ev;
341 struct udev_enumerate *e = NULL;
342 struct udev_list_entry *item = NULL, *first = NULL;
346 if (!(m->udev = udev_new()))
349 if (!(m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"))) {
354 if (udev_monitor_enable_receiving(m->udev_monitor) < 0) {
359 m->udev_watch.type = WATCH_UDEV;
360 m->udev_watch.fd = udev_monitor_get_fd(m->udev_monitor);
364 ev.data.ptr = &m->udev_watch;
366 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_watch.fd, &ev) < 0)
369 if (!(e = udev_enumerate_new(m->udev))) {
374 if (udev_enumerate_scan_devices(e) < 0) {
379 first = udev_enumerate_get_list_entry(e);
380 udev_list_entry_foreach(item, first)
381 device_process_path(m, udev_list_entry_get_name(item), false);
383 udev_enumerate_unref(e);
388 udev_enumerate_unref(e);
394 void device_fd_event(Manager *m, int events) {
395 struct udev_device *dev;
400 assert(events == EPOLLIN);
402 if (!(dev = udev_monitor_receive_device(m->udev_monitor))) {
403 log_error("Failed to receive device.");
407 if (!(action = udev_device_get_action(dev))) {
408 log_error("Failed to get udev action string.");
412 if (streq(action, "remove")) {
413 if ((r = device_process_removed_device(m, dev)) < 0) {
414 log_error("Failed to process udev device event: %s", strerror(-r));
418 if ((r = device_process_new_device(m, dev, true)) < 0) {
419 log_error("Failed to process udev device event: %s", strerror(-r));
425 udev_device_unref(dev);
428 const UnitVTable device_vtable = {
432 .no_instances = true,
433 .no_snapshots = true,
436 .load = unit_load_fragment_and_dropin_optional,
438 .coldplug = device_coldplug,
442 .active_state = device_active_state,
443 .sub_state_to_string = device_sub_state_to_string,
445 .bus_message_handler = bus_device_message_handler,
447 .enumerate = device_enumerate,
448 .shutdown = device_shutdown