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);
50 static void device_init(Unit *u) {
51 Device *d = DEVICE(u);
54 assert(u->meta.load_state == UNIT_STUB);
59 static void device_set_state(Device *d, DeviceState state) {
60 DeviceState old_state;
66 if (state != old_state)
67 log_debug("%s changed %s → %s", unit_id(UNIT(d)), state_string_table[old_state], state_string_table[state]);
69 unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state]);
72 static int device_coldplug(Unit *u) {
73 Device *d = DEVICE(u);
76 assert(d->state == DEVICE_DEAD);
79 device_set_state(d, DEVICE_AVAILABLE);
84 static void device_dump(Unit *u, FILE *f, const char *prefix) {
85 Device *d = DEVICE(u);
90 "%sDevice State: %s\n"
92 prefix, state_string_table[d->state],
93 prefix, strna(d->sysfs));
96 static UnitActiveState device_active_state(Unit *u) {
99 return state_translation_table[DEVICE(u)->state];
102 static int device_add_escaped_name(Unit *u, const char *dn, bool make_id) {
108 assert(dn[0] == '/');
110 if (!(e = unit_name_escape_path(dn+1, ".device")))
113 r = unit_add_name(u, e);
115 if (r >= 0 && make_id)
116 unit_choose_id(u, e);
120 if (r < 0 && r != -EEXIST)
126 static int device_find_escape_name(Manager *m, const char *dn, Unit **_u) {
132 assert(dn[0] == '/');
135 if (!(e = unit_name_escape_path(dn+1, ".device")))
138 u = manager_get_unit(m, e);
149 static bool devnode_is_api(const char *node) {
152 static const char * const table[] = {
164 for (i = 0; i < ELEMENTSOF(table); i++)
165 if (streq(table[i], node))
171 static int device_process_new_device(Manager *m, struct udev_device *dev, bool update_state) {
172 const char *dn, *names, *wants, *sysfs, *expose, *model;
178 struct udev_list_entry *item = NULL, *first = NULL;
182 if (!(sysfs = udev_device_get_syspath(dev)))
185 /* Check whether this entry is even relevant for us. */
186 dn = udev_device_get_devnode(dev);
187 expose = udev_device_get_property_value(dev, "SYSTEMD_EXPOSE");
188 names = udev_device_get_property_value(dev, "SYSTEMD_NAMES");
189 wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS");
194 if ((b = parse_boolean(expose)) < 0) {
195 log_error("Failed to parse SYSTEMD_EXPOSE udev property for device %s: %s", sysfs, expose);
202 if ((!dn || devnode_is_api(dn)) && !names && !wants)
205 /* Ok, seems kinda interesting. Now, let's see if this one
208 if ((r = device_find_escape_name(m, sysfs, &u)) < 0)
212 if ((r = device_find_escape_name(m, dn, &u)) < 0)
216 first = udev_device_get_devlinks_list_entry(dev);
217 udev_list_entry_foreach(item, first) {
218 if ((r = device_find_escape_name(m, udev_list_entry_get_name(item), &u)) < 0)
226 /* FIXME: this needs proper merging */
228 assert((r > 0) == !!u);
230 /* If this is a different unit, then let's not merge things */
231 if (u && DEVICE(u)->sysfs && !streq(DEVICE(u)->sysfs, sysfs))
237 if (!(u = unit_new(m)))
240 if ((r = device_add_escaped_name(u, sysfs, true)) < 0)
243 unit_add_to_load_queue(u);
247 if (!(DEVICE(u)->sysfs))
248 if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
254 if ((r = device_add_escaped_name(u, dn, true)) < 0)
257 first = udev_device_get_devlinks_list_entry(dev);
258 udev_list_entry_foreach(item, first)
259 if ((r = device_add_escaped_name(u, udev_list_entry_get_name(item), false)) < 0)
262 if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) ||
263 (model = udev_device_get_property_value(dev, "ID_MODEL"))) {
264 if ((r = unit_set_description(u, model)) < 0)
267 if ((r = unit_set_description(u, dn)) < 0)
270 /* We don't remove names that are gone. But that should be
271 * fine and should probably be fixed only on a configuration
275 FOREACH_WORD(w, l, names, state) {
278 if (!(e = strndup(w, l))) {
283 r = unit_add_name(u, e);
286 if (r < 0 && r != -EEXIST)
292 FOREACH_WORD(w, l, wants, state) {
295 if (!(e = strndup(w, l))) {
300 r = unit_add_dependency_by_name(u, UNIT_WANTS, e);
309 manager_dispatch_load_queue(u->meta.manager);
310 device_set_state(DEVICE(u), DEVICE_AVAILABLE);
313 unit_add_to_dbus_queue(u);
323 static int device_process_path(Manager *m, const char *path, bool update_state) {
325 struct udev_device *dev;
330 if (!(dev = udev_device_new_from_syspath(m->udev, path))) {
331 log_warning("Failed to get udev device object from udev for path %s.", path);
335 r = device_process_new_device(m, dev, update_state);
336 udev_device_unref(dev);
340 static int device_process_removed_device(Manager *m, struct udev_device *dev) {
349 if (!(sysfs = udev_device_get_syspath(dev)))
352 assert(sysfs[0] == '/');
353 if (!(e = unit_name_escape_path(sysfs+1, ".device")))
356 u = manager_get_unit(m, e);
366 device_set_state(d, DEVICE_DEAD);
370 static void device_shutdown(Manager *m) {
374 udev_monitor_unref(m->udev_monitor);
380 static int device_enumerate(Manager *m) {
381 struct epoll_event ev;
383 struct udev_enumerate *e = NULL;
384 struct udev_list_entry *item = NULL, *first = NULL;
388 if (!(m->udev = udev_new()))
391 if (!(m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"))) {
396 if (udev_monitor_enable_receiving(m->udev_monitor) < 0) {
401 m->udev_watch.type = WATCH_UDEV;
402 m->udev_watch.fd = udev_monitor_get_fd(m->udev_monitor);
406 ev.data.ptr = &m->udev_watch;
408 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_watch.fd, &ev) < 0)
411 if (!(e = udev_enumerate_new(m->udev))) {
416 if (udev_enumerate_scan_devices(e) < 0) {
421 first = udev_enumerate_get_list_entry(e);
422 udev_list_entry_foreach(item, first)
423 device_process_path(m, udev_list_entry_get_name(item), false);
425 udev_enumerate_unref(e);
430 udev_enumerate_unref(e);
436 void device_fd_event(Manager *m, int events) {
437 struct udev_device *dev;
442 assert(events == EPOLLIN);
444 if (!(dev = udev_monitor_receive_device(m->udev_monitor))) {
445 log_error("Failed to receive device.");
449 if (!(action = udev_device_get_action(dev))) {
450 log_error("Failed to get udev action string.");
454 if (streq(action, "remove")) {
455 if ((r = device_process_removed_device(m, dev)) < 0) {
456 log_error("Failed to process udev device event: %s", strerror(-r));
460 if ((r = device_process_new_device(m, dev, true)) < 0) {
461 log_error("Failed to process udev device event: %s", strerror(-r));
467 udev_device_unref(dev);
470 const UnitVTable device_vtable = {
474 .load = unit_load_fragment_and_dropin_optional,
476 .coldplug = device_coldplug,
480 .active_state = device_active_state,
482 .enumerate = device_enumerate,
483 .shutdown = device_shutdown