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"
32 static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = {
33 [DEVICE_DEAD] = UNIT_INACTIVE,
34 [DEVICE_AVAILABLE] = UNIT_ACTIVE
37 static const char* const state_string_table[_DEVICE_STATE_MAX] = {
38 [DEVICE_DEAD] = "dead",
39 [DEVICE_AVAILABLE] = "available"
42 static void device_done(Unit *u) {
43 Device *d = DEVICE(u);
51 static void device_init(Unit *u) {
52 Device *d = DEVICE(u);
55 assert(u->meta.load_state == UNIT_STUB);
60 static void device_set_state(Device *d, DeviceState state) {
61 DeviceState old_state;
67 if (state != old_state)
68 log_debug("%s changed %s → %s", UNIT(d)->meta.id, state_string_table[old_state], state_string_table[state]);
70 unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state]);
73 static int device_coldplug(Unit *u) {
74 Device *d = DEVICE(u);
77 assert(d->state == DEVICE_DEAD);
80 device_set_state(d, DEVICE_AVAILABLE);
85 static void device_dump(Unit *u, FILE *f, const char *prefix) {
86 Device *d = DEVICE(u);
91 "%sDevice State: %s\n"
93 prefix, state_string_table[d->state],
94 prefix, strna(d->sysfs));
97 static UnitActiveState device_active_state(Unit *u) {
100 return state_translation_table[DEVICE(u)->state];
103 static const char *device_sub_state_to_string(Unit *u) {
106 return state_string_table[DEVICE(u)->state];
109 static int device_add_escaped_name(Unit *u, const char *dn, bool make_id) {
115 assert(dn[0] == '/');
117 if (!(e = unit_name_build_escape(dn+1, NULL, ".device")))
120 r = unit_add_name(u, e);
122 if (r >= 0 && make_id)
123 unit_choose_id(u, e);
127 if (r < 0 && r != -EEXIST)
133 static int device_find_escape_name(Manager *m, const char *dn, Unit **_u) {
139 assert(dn[0] == '/');
142 if (!(e = unit_name_build_escape(dn+1, NULL, ".device")))
145 u = manager_get_unit(m, e);
156 static bool devnode_is_api(const char *node) {
159 static const char * const table[] = {
171 for (i = 0; i < ELEMENTSOF(table); i++)
172 if (streq(table[i], node))
178 static int device_process_new_device(Manager *m, struct udev_device *dev, bool update_state) {
179 const char *dn, *names, *wants, *sysfs, *expose, *model;
185 struct udev_list_entry *item = NULL, *first = NULL;
189 if (!(sysfs = udev_device_get_syspath(dev)))
192 /* Check whether this entry is even relevant for us. */
193 dn = udev_device_get_devnode(dev);
194 expose = udev_device_get_property_value(dev, "SYSTEMD_EXPOSE");
195 names = udev_device_get_property_value(dev, "SYSTEMD_NAMES");
196 wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS");
201 if ((b = parse_boolean(expose)) < 0) {
202 log_error("Failed to parse SYSTEMD_EXPOSE udev property for device %s: %s", sysfs, expose);
209 if ((!dn || devnode_is_api(dn)) && !names && !wants)
212 /* Ok, seems kinda interesting. Now, let's see if this one
215 if ((r = device_find_escape_name(m, sysfs, &u)) < 0)
219 if ((r = device_find_escape_name(m, dn, &u)) < 0)
223 first = udev_device_get_devlinks_list_entry(dev);
224 udev_list_entry_foreach(item, first) {
225 if ((r = device_find_escape_name(m, udev_list_entry_get_name(item), &u)) < 0)
233 /* FIXME: this needs proper merging */
235 assert((r > 0) == !!u);
237 /* If this is a different unit, then let's not merge things */
238 if (u && DEVICE(u)->sysfs && !streq(DEVICE(u)->sysfs, sysfs))
244 if (!(u = unit_new(m)))
247 if ((r = device_add_escaped_name(u, sysfs, true)) < 0)
250 unit_add_to_load_queue(u);
254 if (!(DEVICE(u)->sysfs))
255 if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
261 if ((r = device_add_escaped_name(u, dn, true)) < 0)
264 first = udev_device_get_devlinks_list_entry(dev);
265 udev_list_entry_foreach(item, first)
266 if ((r = device_add_escaped_name(u, udev_list_entry_get_name(item), false)) < 0)
269 if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) ||
270 (model = udev_device_get_property_value(dev, "ID_MODEL"))) {
271 if ((r = unit_set_description(u, model)) < 0)
274 if ((r = unit_set_description(u, dn)) < 0)
277 /* We don't remove names that are gone. But that should be
278 * fine and should probably be fixed only on a configuration
282 FOREACH_WORD(w, l, names, state) {
285 if (!(e = strndup(w, l))) {
290 r = unit_add_name(u, e);
293 if (r < 0 && r != -EEXIST)
299 FOREACH_WORD(w, l, wants, state) {
302 if (!(e = strndup(w, l))) {
307 r = unit_add_dependency_by_name(u, UNIT_WANTS, NULL, e);
316 manager_dispatch_load_queue(u->meta.manager);
317 device_set_state(DEVICE(u), DEVICE_AVAILABLE);
320 unit_add_to_dbus_queue(u);
330 static int device_process_path(Manager *m, const char *path, bool update_state) {
332 struct udev_device *dev;
337 if (!(dev = udev_device_new_from_syspath(m->udev, path))) {
338 log_warning("Failed to get udev device object from udev for path %s.", path);
342 r = device_process_new_device(m, dev, update_state);
343 udev_device_unref(dev);
347 static int device_process_removed_device(Manager *m, struct udev_device *dev) {
356 if (!(sysfs = udev_device_get_syspath(dev)))
359 assert(sysfs[0] == '/');
360 if (!(e = unit_name_build_escape(sysfs+1, NULL, ".device")))
363 u = manager_get_unit(m, e);
373 device_set_state(d, DEVICE_DEAD);
377 static void device_shutdown(Manager *m) {
381 udev_monitor_unref(m->udev_monitor);
387 static int device_enumerate(Manager *m) {
388 struct epoll_event ev;
390 struct udev_enumerate *e = NULL;
391 struct udev_list_entry *item = NULL, *first = NULL;
395 if (!(m->udev = udev_new()))
398 if (!(m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"))) {
403 if (udev_monitor_enable_receiving(m->udev_monitor) < 0) {
408 m->udev_watch.type = WATCH_UDEV;
409 m->udev_watch.fd = udev_monitor_get_fd(m->udev_monitor);
413 ev.data.ptr = &m->udev_watch;
415 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_watch.fd, &ev) < 0)
418 if (!(e = udev_enumerate_new(m->udev))) {
423 if (udev_enumerate_scan_devices(e) < 0) {
428 first = udev_enumerate_get_list_entry(e);
429 udev_list_entry_foreach(item, first)
430 device_process_path(m, udev_list_entry_get_name(item), false);
432 udev_enumerate_unref(e);
437 udev_enumerate_unref(e);
443 void device_fd_event(Manager *m, int events) {
444 struct udev_device *dev;
449 assert(events == EPOLLIN);
451 if (!(dev = udev_monitor_receive_device(m->udev_monitor))) {
452 log_error("Failed to receive device.");
456 if (!(action = udev_device_get_action(dev))) {
457 log_error("Failed to get udev action string.");
461 if (streq(action, "remove")) {
462 if ((r = device_process_removed_device(m, dev)) < 0) {
463 log_error("Failed to process udev device event: %s", strerror(-r));
467 if ((r = device_process_new_device(m, dev, true)) < 0) {
468 log_error("Failed to process udev device event: %s", strerror(-r));
474 udev_device_unref(dev);
477 const UnitVTable device_vtable = {
481 .no_instances = true,
484 .load = unit_load_fragment_and_dropin_optional,
486 .coldplug = device_coldplug,
490 .active_state = device_active_state,
491 .sub_state_to_string = device_sub_state_to_string,
493 .enumerate = device_enumerate,
494 .shutdown = device_shutdown