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
, *names
, *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 names
= udev_device_get_property_value(dev
, "SYSTEMD_NAMES");
186 wants
= udev_device_get_property_value(dev
, "SYSTEMD_WANTS");
188 if ((r
= device_find_escape_name(m
, sysfs
, &u
)) < 0)
192 if ((r
= device_find_escape_name(m
, dn
, &u
)) < 0)
196 first
= udev_device_get_devlinks_list_entry(dev
);
197 udev_list_entry_foreach(item
, first
) {
198 if ((r
= device_find_escape_name(m
, udev_list_entry_get_name(item
), &u
)) < 0)
206 /* FIXME: this needs proper merging */
208 assert((r
> 0) == !!u
);
210 /* If this is a different unit, then let's not merge things */
211 if (u
&& DEVICE(u
)->sysfs
&& !streq(DEVICE(u
)->sysfs
, sysfs
))
217 if (!(u
= unit_new(m
)))
220 if ((r
= device_add_escaped_name(u
, sysfs
, true)) < 0)
223 unit_add_to_load_queue(u
);
227 if (!(DEVICE(u
)->sysfs
))
228 if (!(DEVICE(u
)->sysfs
= strdup(sysfs
))) {
234 if ((r
= device_add_escaped_name(u
, dn
, true)) < 0)
237 first
= udev_device_get_devlinks_list_entry(dev
);
238 udev_list_entry_foreach(item
, first
)
239 if ((r
= device_add_escaped_name(u
, udev_list_entry_get_name(item
), false)) < 0)
242 if ((model
= udev_device_get_property_value(dev
, "ID_MODEL_FROM_DATABASE")) ||
243 (model
= udev_device_get_property_value(dev
, "ID_MODEL"))) {
244 if ((r
= unit_set_description(u
, model
)) < 0)
247 if ((r
= unit_set_description(u
, dn
)) < 0)
250 /* We don't remove names that are gone. But that should be
251 * fine and should probably be fixed only on a configuration
255 FOREACH_WORD(w
, l
, names
, state
) {
258 if (!(e
= strndup(w
, l
))) {
263 r
= unit_add_name(u
, e
);
266 if (r
< 0 && r
!= -EEXIST
)
272 FOREACH_WORD(w
, l
, wants
, state
) {
275 if (!(e
= strndup(w
, l
))) {
280 r
= unit_add_dependency_by_name(u
, UNIT_WANTS
, NULL
, e
);
289 manager_dispatch_load_queue(u
->meta
.manager
);
290 device_set_state(DEVICE(u
), DEVICE_AVAILABLE
);
293 unit_add_to_dbus_queue(u
);
303 static int device_process_path(Manager
*m
, const char *path
, bool update_state
) {
305 struct udev_device
*dev
;
310 if (!(dev
= udev_device_new_from_syspath(m
->udev
, path
))) {
311 log_warning("Failed to get udev device object from udev for path %s.", path
);
315 r
= device_process_new_device(m
, dev
, update_state
);
316 udev_device_unref(dev
);
320 static int device_process_removed_device(Manager
*m
, struct udev_device
*dev
) {
329 if (!(sysfs
= udev_device_get_syspath(dev
)))
332 assert(sysfs
[0] == '/');
333 if (!(e
= unit_name_build_escape(sysfs
+1, NULL
, ".device")))
336 u
= manager_get_unit(m
, e
);
346 device_set_state(d
, DEVICE_DEAD
);
350 static void device_shutdown(Manager
*m
) {
354 udev_monitor_unref(m
->udev_monitor
);
360 static int device_enumerate(Manager
*m
) {
361 struct epoll_event ev
;
363 struct udev_enumerate
*e
= NULL
;
364 struct udev_list_entry
*item
= NULL
, *first
= NULL
;
368 if (!(m
->udev
= udev_new()))
371 if (!(m
->udev_monitor
= udev_monitor_new_from_netlink(m
->udev
, "udev"))) {
376 if (udev_monitor_enable_receiving(m
->udev_monitor
) < 0) {
381 m
->udev_watch
.type
= WATCH_UDEV
;
382 m
->udev_watch
.fd
= udev_monitor_get_fd(m
->udev_monitor
);
386 ev
.data
.ptr
= &m
->udev_watch
;
388 if (epoll_ctl(m
->epoll_fd
, EPOLL_CTL_ADD
, m
->udev_watch
.fd
, &ev
) < 0)
391 if (!(e
= udev_enumerate_new(m
->udev
))) {
396 if (udev_enumerate_scan_devices(e
) < 0) {
401 first
= udev_enumerate_get_list_entry(e
);
402 udev_list_entry_foreach(item
, first
)
403 device_process_path(m
, udev_list_entry_get_name(item
), false);
405 udev_enumerate_unref(e
);
410 udev_enumerate_unref(e
);
416 void device_fd_event(Manager
*m
, int events
) {
417 struct udev_device
*dev
;
422 assert(events
== EPOLLIN
);
424 if (!(dev
= udev_monitor_receive_device(m
->udev_monitor
))) {
425 log_error("Failed to receive device.");
429 if (!(action
= udev_device_get_action(dev
))) {
430 log_error("Failed to get udev action string.");
434 if (streq(action
, "remove")) {
435 if ((r
= device_process_removed_device(m
, dev
)) < 0) {
436 log_error("Failed to process udev device event: %s", strerror(-r
));
440 if ((r
= device_process_new_device(m
, dev
, true)) < 0) {
441 log_error("Failed to process udev device event: %s", strerror(-r
));
447 udev_device_unref(dev
);
450 const UnitVTable device_vtable
= {
454 .no_instances
= true,
455 .no_snapshots
= true,
458 .load
= unit_load_fragment_and_dropin_optional
,
460 .coldplug
= device_coldplug
,
464 .active_state
= device_active_state
,
465 .sub_state_to_string
= device_sub_state_to_string
,
467 .bus_message_handler
= bus_device_message_handler
,
469 .enumerate
= device_enumerate
,
470 .shutdown
= device_shutdown