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 void device_done(Unit *u) {
39 Device *d = DEVICE(u);
47 static void device_set_state(Device *d, DeviceState state) {
48 DeviceState old_state;
54 if (state != old_state)
55 log_debug("%s changed %s -> %s",
57 device_state_to_string(old_state),
58 device_state_to_string(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, device_state_to_string(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 const char *device_sub_state_to_string(Unit *u) {
96 return device_state_to_string(DEVICE(u)->state);
99 static int device_add_escaped_name(Unit *u, const char *dn, bool make_id) {
105 assert(dn[0] == '/');
107 if (!(e = unit_name_from_path(dn, ".device")))
110 r = unit_add_name(u, e);
112 if (r >= 0 && make_id)
113 unit_choose_id(u, e);
117 if (r < 0 && r != -EEXIST)
123 static int device_find_escape_name(Manager *m, const char *dn, Unit **_u) {
129 assert(dn[0] == '/');
132 if (!(e = unit_name_from_path(dn, ".device")))
135 u = manager_get_unit(m, e);
146 static int device_process_new_device(Manager *m, struct udev_device *dev, bool update_state) {
147 const char *dn, *wants, *sysfs, *model, *alias;
153 struct udev_list_entry *item = NULL, *first = NULL;
157 if (!(sysfs = udev_device_get_syspath(dev)))
160 /* Check whether this entry is even relevant for us. */
161 dn = udev_device_get_devnode(dev);
162 wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS");
163 alias = udev_device_get_property_value(dev, "SYSTEMD_ALIAS");
165 /* We allow exactly one alias to be configured a this time and
166 * it must be a path */
168 if (alias && !is_path(alias)) {
169 log_warning("SYSTEMD_ALIAS for %s is not a path, ignoring: %s", sysfs, alias);
173 if ((r = device_find_escape_name(m, sysfs, &u)) < 0)
177 if ((r = device_find_escape_name(m, dn, &u)) < 0)
181 first = udev_device_get_devlinks_list_entry(dev);
182 udev_list_entry_foreach(item, first) {
183 if ((r = device_find_escape_name(m, udev_list_entry_get_name(item), &u)) < 0)
192 if ((r = device_find_escape_name(m, alias, &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 && !path_equal(DEVICE(u)->sysfs, sysfs))
206 if (!(u = unit_new(m)))
209 if ((r = device_add_escaped_name(u, sysfs, true)) < 0)
212 unit_add_to_load_queue(u);
216 if (!(DEVICE(u)->sysfs))
217 if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
223 if ((r = device_add_escaped_name(u, alias, true)) < 0)
227 if ((r = device_add_escaped_name(u, dn, true)) < 0)
230 first = udev_device_get_devlinks_list_entry(dev);
231 udev_list_entry_foreach(item, first)
232 if ((r = device_add_escaped_name(u, udev_list_entry_get_name(item), false)) < 0)
235 if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) ||
236 (model = udev_device_get_property_value(dev, "ID_MODEL"))) {
237 if ((r = unit_set_description(u, model)) < 0)
240 if ((r = unit_set_description(u, dn)) < 0)
243 if ((r = unit_set_description(u, sysfs)) < 0)
247 FOREACH_WORD_QUOTED(w, l, wants, state) {
250 if (!(e = strndup(w, l))) {
255 r = unit_add_dependency_by_name(u, UNIT_WANTS, NULL, e, true);
264 manager_dispatch_load_queue(u->meta.manager);
265 device_set_state(DEVICE(u), DEVICE_AVAILABLE);
268 unit_add_to_dbus_queue(u);
278 static int device_process_path(Manager *m, const char *path, bool update_state) {
280 struct udev_device *dev;
285 if (!(dev = udev_device_new_from_syspath(m->udev, path))) {
286 log_warning("Failed to get udev device object from udev for path %s.", path);
290 r = device_process_new_device(m, dev, update_state);
291 udev_device_unref(dev);
295 static int device_process_removed_device(Manager *m, struct udev_device *dev) {
304 if (!(sysfs = udev_device_get_syspath(dev)))
307 assert(sysfs[0] == '/');
308 if (!(e = unit_name_from_path(sysfs, ".device")))
311 u = manager_get_unit(m, e);
321 device_set_state(d, DEVICE_DEAD);
325 static void device_shutdown(Manager *m) {
328 if (m->udev_monitor) {
329 udev_monitor_unref(m->udev_monitor);
330 m->udev_monitor = NULL;
339 static int device_enumerate(Manager *m) {
340 struct epoll_event ev;
342 struct udev_enumerate *e = NULL;
343 struct udev_list_entry *item = NULL, *first = NULL;
348 if (!(m->udev = udev_new()))
351 if (!(m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"))) {
356 if (udev_monitor_filter_add_match_tag(m->udev_monitor, "systemd") < 0) {
361 if (udev_monitor_enable_receiving(m->udev_monitor) < 0) {
366 m->udev_watch.type = WATCH_UDEV;
367 m->udev_watch.fd = udev_monitor_get_fd(m->udev_monitor);
371 ev.data.ptr = &m->udev_watch;
373 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_watch.fd, &ev) < 0)
377 if (!(e = udev_enumerate_new(m->udev))) {
381 if (udev_enumerate_add_match_tag(e, "systemd") < 0) {
386 if (udev_enumerate_scan_devices(e) < 0) {
391 first = udev_enumerate_get_list_entry(e);
392 udev_list_entry_foreach(item, first)
393 device_process_path(m, udev_list_entry_get_name(item), false);
395 udev_enumerate_unref(e);
400 udev_enumerate_unref(e);
406 void device_fd_event(Manager *m, int events) {
407 struct udev_device *dev;
412 assert(events == EPOLLIN);
414 if (!(dev = udev_monitor_receive_device(m->udev_monitor))) {
415 log_error("Failed to receive device.");
419 if (!(action = udev_device_get_action(dev))) {
420 log_error("Failed to get udev action string.");
424 if (streq(action, "remove")) {
425 if ((r = device_process_removed_device(m, dev)) < 0) {
426 log_error("Failed to process udev device event: %s", strerror(-r));
430 if ((r = device_process_new_device(m, dev, true)) < 0) {
431 log_error("Failed to process udev device event: %s", strerror(-r));
437 udev_device_unref(dev);
440 static const char* const device_state_table[_DEVICE_STATE_MAX] = {
441 [DEVICE_DEAD] = "dead",
442 [DEVICE_AVAILABLE] = "available"
445 DEFINE_STRING_TABLE_LOOKUP(device_state, DeviceState);
447 const UnitVTable device_vtable = {
451 .no_instances = true,
452 .no_snapshots = true,
455 .load = unit_load_fragment_and_dropin_optional,
457 .coldplug = device_coldplug,
461 .active_state = device_active_state,
462 .sub_state_to_string = device_sub_state_to_string,
464 .bus_message_handler = bus_device_message_handler,
466 .enumerate = device_enumerate,
467 .shutdown = device_shutdown