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 int device_process_new_device(Manager
*m
, struct udev_device
*dev
, bool update_state
) {
157 const char *dn
, *names
, *wants
, *sysfs
, *expose
, *model
;
163 struct udev_list_entry
*item
= NULL
, *first
= NULL
;
168 if (!(sysfs
= udev_device_get_syspath(dev
)))
171 if (!(expose
= udev_device_get_property_value(dev
, "SYSTEMD_EXPOSE")))
174 if ((b
= parse_boolean(expose
)) < 0) {
175 log_error("Failed to parse SYSTEMD_EXPOSE udev property for device %s: %s", sysfs
, expose
);
182 /* Check whether this entry is even relevant for us. */
183 dn
= udev_device_get_devnode(dev
);
184 names
= udev_device_get_property_value(dev
, "SYSTEMD_NAMES");
185 wants
= udev_device_get_property_value(dev
, "SYSTEMD_WANTS");
187 if ((r
= device_find_escape_name(m
, sysfs
, &u
)) < 0)
191 if ((r
= device_find_escape_name(m
, dn
, &u
)) < 0)
195 first
= udev_device_get_devlinks_list_entry(dev
);
196 udev_list_entry_foreach(item
, first
) {
197 if ((r
= device_find_escape_name(m
, udev_list_entry_get_name(item
), &u
)) < 0)
205 /* FIXME: this needs proper merging */
207 assert((r
> 0) == !!u
);
209 /* If this is a different unit, then let's not merge things */
210 if (u
&& DEVICE(u
)->sysfs
&& !streq(DEVICE(u
)->sysfs
, sysfs
))
216 if (!(u
= unit_new(m
)))
219 if ((r
= device_add_escaped_name(u
, sysfs
, true)) < 0)
222 unit_add_to_load_queue(u
);
226 if (!(DEVICE(u
)->sysfs
))
227 if (!(DEVICE(u
)->sysfs
= strdup(sysfs
))) {
233 if ((r
= device_add_escaped_name(u
, dn
, true)) < 0)
236 first
= udev_device_get_devlinks_list_entry(dev
);
237 udev_list_entry_foreach(item
, first
)
238 if ((r
= device_add_escaped_name(u
, udev_list_entry_get_name(item
), false)) < 0)
241 if ((model
= udev_device_get_property_value(dev
, "ID_MODEL_FROM_DATABASE")) ||
242 (model
= udev_device_get_property_value(dev
, "ID_MODEL"))) {
243 if ((r
= unit_set_description(u
, model
)) < 0)
246 if ((r
= unit_set_description(u
, dn
)) < 0)
249 /* We don't remove names that are gone. But that should be
250 * fine and should probably be fixed only on a configuration
254 FOREACH_WORD(w
, l
, names
, state
) {
257 if (!(e
= strndup(w
, l
))) {
262 r
= unit_add_name(u
, e
);
265 if (r
< 0 && r
!= -EEXIST
)
271 FOREACH_WORD(w
, l
, wants
, state
) {
274 if (!(e
= strndup(w
, l
))) {
279 r
= unit_add_dependency_by_name(u
, UNIT_WANTS
, NULL
, e
);
288 manager_dispatch_load_queue(u
->meta
.manager
);
289 device_set_state(DEVICE(u
), DEVICE_AVAILABLE
);
292 unit_add_to_dbus_queue(u
);
302 static int device_process_path(Manager
*m
, const char *path
, bool update_state
) {
304 struct udev_device
*dev
;
309 if (!(dev
= udev_device_new_from_syspath(m
->udev
, path
))) {
310 log_warning("Failed to get udev device object from udev for path %s.", path
);
314 r
= device_process_new_device(m
, dev
, update_state
);
315 udev_device_unref(dev
);
319 static int device_process_removed_device(Manager
*m
, struct udev_device
*dev
) {
328 if (!(sysfs
= udev_device_get_syspath(dev
)))
331 assert(sysfs
[0] == '/');
332 if (!(e
= unit_name_build_escape(sysfs
+1, NULL
, ".device")))
335 u
= manager_get_unit(m
, e
);
345 device_set_state(d
, DEVICE_DEAD
);
349 static void device_shutdown(Manager
*m
) {
353 udev_monitor_unref(m
->udev_monitor
);
359 static int device_enumerate(Manager
*m
) {
360 struct epoll_event ev
;
362 struct udev_enumerate
*e
= NULL
;
363 struct udev_list_entry
*item
= NULL
, *first
= NULL
;
367 if (!(m
->udev
= udev_new()))
370 if (!(m
->udev_monitor
= udev_monitor_new_from_netlink(m
->udev
, "udev"))) {
375 if (udev_monitor_enable_receiving(m
->udev_monitor
) < 0) {
380 m
->udev_watch
.type
= WATCH_UDEV
;
381 m
->udev_watch
.fd
= udev_monitor_get_fd(m
->udev_monitor
);
385 ev
.data
.ptr
= &m
->udev_watch
;
387 if (epoll_ctl(m
->epoll_fd
, EPOLL_CTL_ADD
, m
->udev_watch
.fd
, &ev
) < 0)
390 if (!(e
= udev_enumerate_new(m
->udev
))) {
395 if (udev_enumerate_scan_devices(e
) < 0) {
400 first
= udev_enumerate_get_list_entry(e
);
401 udev_list_entry_foreach(item
, first
)
402 device_process_path(m
, udev_list_entry_get_name(item
), false);
404 udev_enumerate_unref(e
);
409 udev_enumerate_unref(e
);
415 void device_fd_event(Manager
*m
, int events
) {
416 struct udev_device
*dev
;
421 assert(events
== EPOLLIN
);
423 if (!(dev
= udev_monitor_receive_device(m
->udev_monitor
))) {
424 log_error("Failed to receive device.");
428 if (!(action
= udev_device_get_action(dev
))) {
429 log_error("Failed to get udev action string.");
433 if (streq(action
, "remove")) {
434 if ((r
= device_process_removed_device(m
, dev
)) < 0) {
435 log_error("Failed to process udev device event: %s", strerror(-r
));
439 if ((r
= device_process_new_device(m
, dev
, true)) < 0) {
440 log_error("Failed to process udev device event: %s", strerror(-r
));
446 udev_device_unref(dev
);
449 const UnitVTable device_vtable
= {
453 .no_instances
= true,
454 .no_snapshots
= true,
457 .load
= unit_load_fragment_and_dropin_optional
,
459 .coldplug
= device_coldplug
,
463 .active_state
= device_active_state
,
464 .sub_state_to_string
= device_sub_state_to_string
,
466 .enumerate
= device_enumerate
,
467 .shutdown
= device_shutdown