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
, *expose
, *model
;
153 struct udev_list_entry
*item
= NULL
, *first
= NULL
;
158 if (!(sysfs
= udev_device_get_syspath(dev
)))
161 if (!(expose
= udev_device_get_property_value(dev
, "SYSTEMD_EXPOSE")))
164 if ((b
= parse_boolean(expose
)) < 0) {
165 log_error("Failed to parse SYSTEMD_EXPOSE udev property for device %s: %s", sysfs
, expose
);
172 /* Check whether this entry is even relevant for us. */
173 dn
= udev_device_get_devnode(dev
);
174 wants
= udev_device_get_property_value(dev
, "SYSTEMD_WANTS");
176 if ((r
= device_find_escape_name(m
, sysfs
, &u
)) < 0)
180 if ((r
= device_find_escape_name(m
, dn
, &u
)) < 0)
184 first
= udev_device_get_devlinks_list_entry(dev
);
185 udev_list_entry_foreach(item
, first
) {
186 if ((r
= device_find_escape_name(m
, udev_list_entry_get_name(item
), &u
)) < 0)
194 /* FIXME: this needs proper merging */
196 assert((r
> 0) == !!u
);
198 /* If this is a different unit, then let's not merge things */
199 if (u
&& DEVICE(u
)->sysfs
&& !streq(DEVICE(u
)->sysfs
, sysfs
))
205 if (!(u
= unit_new(m
)))
208 if ((r
= device_add_escaped_name(u
, sysfs
, true)) < 0)
211 unit_add_to_load_queue(u
);
215 if (!(DEVICE(u
)->sysfs
))
216 if (!(DEVICE(u
)->sysfs
= strdup(sysfs
))) {
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)
239 FOREACH_WORD(w
, l
, wants
, state
) {
242 if (!(e
= strndup(w
, l
))) {
247 r
= unit_add_dependency_by_name(u
, UNIT_WANTS
, NULL
, e
, true);
256 manager_dispatch_load_queue(u
->meta
.manager
);
257 device_set_state(DEVICE(u
), DEVICE_AVAILABLE
);
260 unit_add_to_dbus_queue(u
);
270 static int device_process_path(Manager
*m
, const char *path
, bool update_state
) {
272 struct udev_device
*dev
;
277 if (!(dev
= udev_device_new_from_syspath(m
->udev
, path
))) {
278 log_warning("Failed to get udev device object from udev for path %s.", path
);
282 r
= device_process_new_device(m
, dev
, update_state
);
283 udev_device_unref(dev
);
287 static int device_process_removed_device(Manager
*m
, struct udev_device
*dev
) {
296 if (!(sysfs
= udev_device_get_syspath(dev
)))
299 assert(sysfs
[0] == '/');
300 if (!(e
= unit_name_from_path(sysfs
, ".device")))
303 u
= manager_get_unit(m
, e
);
313 device_set_state(d
, DEVICE_DEAD
);
317 static void device_shutdown(Manager
*m
) {
320 if (m
->udev_monitor
) {
321 udev_monitor_unref(m
->udev_monitor
);
322 m
->udev_monitor
= NULL
;
331 static int device_enumerate(Manager
*m
) {
332 struct epoll_event ev
;
334 struct udev_enumerate
*e
= NULL
;
335 struct udev_list_entry
*item
= NULL
, *first
= NULL
;
340 if (!(m
->udev
= udev_new()))
343 if (!(m
->udev_monitor
= udev_monitor_new_from_netlink(m
->udev
, "udev"))) {
348 if (udev_monitor_enable_receiving(m
->udev_monitor
) < 0) {
353 m
->udev_watch
.type
= WATCH_UDEV
;
354 m
->udev_watch
.fd
= udev_monitor_get_fd(m
->udev_monitor
);
358 ev
.data
.ptr
= &m
->udev_watch
;
360 if (epoll_ctl(m
->epoll_fd
, EPOLL_CTL_ADD
, m
->udev_watch
.fd
, &ev
) < 0)
364 if (!(e
= udev_enumerate_new(m
->udev
))) {
369 if (udev_enumerate_scan_devices(e
) < 0) {
374 first
= udev_enumerate_get_list_entry(e
);
375 udev_list_entry_foreach(item
, first
)
376 device_process_path(m
, udev_list_entry_get_name(item
), false);
378 udev_enumerate_unref(e
);
383 udev_enumerate_unref(e
);
389 void device_fd_event(Manager
*m
, int events
) {
390 struct udev_device
*dev
;
395 assert(events
== EPOLLIN
);
397 if (!(dev
= udev_monitor_receive_device(m
->udev_monitor
))) {
398 log_error("Failed to receive device.");
402 if (!(action
= udev_device_get_action(dev
))) {
403 log_error("Failed to get udev action string.");
407 if (streq(action
, "remove")) {
408 if ((r
= device_process_removed_device(m
, dev
)) < 0) {
409 log_error("Failed to process udev device event: %s", strerror(-r
));
413 if ((r
= device_process_new_device(m
, dev
, true)) < 0) {
414 log_error("Failed to process udev device event: %s", strerror(-r
));
420 udev_device_unref(dev
);
423 static const char* const device_state_table
[_DEVICE_STATE_MAX
] = {
424 [DEVICE_DEAD
] = "dead",
425 [DEVICE_AVAILABLE
] = "available"
428 DEFINE_STRING_TABLE_LOOKUP(device_state
, DeviceState
);
430 const UnitVTable device_vtable
= {
434 .no_instances
= true,
435 .no_snapshots
= true,
438 .load
= unit_load_fragment_and_dropin_optional
,
440 .coldplug
= device_coldplug
,
444 .active_state
= device_active_state
,
445 .sub_state_to_string
= device_sub_state_to_string
,
447 .bus_message_handler
= bus_device_message_handler
,
449 .enumerate
= device_enumerate
,
450 .shutdown
= device_shutdown