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
);
48 static void device_set_state(Device
*d
, DeviceState state
) {
49 DeviceState old_state
;
52 if (state
== d
->state
)
58 log_debug("%s changed %s → %s", unit_id(UNIT(d
)), state_string_table
[old_state
], state_string_table
[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
, state_string_table
[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 int device_add_escaped_name(Unit
*u
, const char *dn
, bool make_id
) {
101 if (!(e
= unit_name_escape_path(dn
+1, ".device")))
104 r
= unit_add_name(u
, e
);
106 if (r
>= 0 && make_id
)
107 unit_choose_id(u
, e
);
111 if (r
< 0 && r
!= -EEXIST
)
117 static int device_process_new_device(Manager
*m
, struct udev_device
*dev
, bool update_state
) {
118 const char *dn
, *names
, *wants
, *sysfs
, *expose
;
124 struct udev_list_entry
*item
= NULL
, *first
= NULL
;
128 if (!(sysfs
= udev_device_get_syspath(dev
)))
131 /* Check whether this entry is even relevant for us. */
132 dn
= udev_device_get_devnode(dev
);
133 expose
= udev_device_get_property_value(dev
, "SYSTEMD_EXPOSE");
134 names
= udev_device_get_property_value(dev
, "SYSTEMD_NAMES");
135 wants
= udev_device_get_property_value(dev
, "SYSTEMD_WANTS");
140 if ((b
= parse_boolean(expose
)) < 0) {
141 log_error("Failed to parse SYSTEMD_EXPOSE udev property for device %s: %s", sysfs
, expose
);
148 if (!dn
&& !names
&& !wants
)
151 /* Ok, seems kinda interesting. Now, let's see if this one
154 assert(sysfs
[0] == '/');
155 if (!(e
= unit_name_escape_path(sysfs
+1, ".device")))
158 if (!(u
= manager_get_unit(m
, e
))) {
163 if (!(u
= unit_new(m
))) {
168 r
= unit_add_name(u
, e
);
174 if (!(DEVICE(u
)->sysfs
= strdup(sysfs
))) {
179 if ((model
= udev_device_get_property_value(dev
, "ID_MODEL_FROM_DATABASE")) ||
180 (model
= udev_device_get_property_value(dev
, "ID_MODEL"))) {
181 if ((r
= unit_set_description(u
, model
)) < 0)
184 if ((r
= unit_set_description(u
, dn
)) < 0)
187 unit_add_to_load_queue(u
);
194 if ((r
= device_add_escaped_name(u
, dn
, true)) < 0)
197 first
= udev_device_get_devlinks_list_entry(dev
);
198 udev_list_entry_foreach(item
, first
)
199 if ((r
= device_add_escaped_name(u
, udev_list_entry_get_name(item
), false)) < 0)
203 FOREACH_WORD(w
, l
, names
, state
) {
204 if (!(e
= strndup(w
, l
))) {
209 r
= unit_add_name(u
, e
);
212 if (r
< 0 && r
!= -EEXIST
)
218 FOREACH_WORD(w
, l
, wants
, state
) {
219 if (!(e
= strndup(w
, l
))) {
224 r
= unit_add_dependency_by_name(u
, UNIT_WANTS
, e
);
233 manager_dispatch_load_queue(u
->meta
.manager
);
234 device_set_state(DEVICE(u
), DEVICE_AVAILABLE
);
237 unit_add_to_dbus_queue(u
);
247 static int device_process_path(Manager
*m
, const char *path
, bool update_state
) {
249 struct udev_device
*dev
;
254 if (!(dev
= udev_device_new_from_syspath(m
->udev
, path
))) {
255 log_warning("Failed to get udev device object from udev for path %s.", path
);
259 r
= device_process_new_device(m
, dev
, update_state
);
260 udev_device_unref(dev
);
264 static int device_process_removed_device(Manager
*m
, struct udev_device
*dev
) {
273 if (!(sysfs
= udev_device_get_syspath(dev
)))
276 assert(sysfs
[0] == '/');
277 if (!(e
= unit_name_escape_path(sysfs
+1, ".device")))
280 u
= manager_get_unit(m
, e
);
290 device_set_state(d
, DEVICE_DEAD
);
294 static void device_shutdown(Manager
*m
) {
298 udev_monitor_unref(m
->udev_monitor
);
304 static int device_enumerate(Manager
*m
) {
305 struct epoll_event ev
;
307 struct udev_enumerate
*e
= NULL
;
308 struct udev_list_entry
*item
= NULL
, *first
= NULL
;
312 if (!(m
->udev
= udev_new()))
315 if (!(m
->udev_monitor
= udev_monitor_new_from_netlink(m
->udev
, "udev"))) {
320 if (udev_monitor_enable_receiving(m
->udev_monitor
) < 0) {
325 m
->udev_watch
.type
= WATCH_UDEV
;
326 m
->udev_watch
.fd
= udev_monitor_get_fd(m
->udev_monitor
);
330 ev
.data
.ptr
= &m
->udev_watch
;
332 if (epoll_ctl(m
->epoll_fd
, EPOLL_CTL_ADD
, m
->udev_watch
.fd
, &ev
) < 0)
335 if (!(e
= udev_enumerate_new(m
->udev
))) {
340 if (udev_enumerate_scan_devices(e
) < 0) {
345 first
= udev_enumerate_get_list_entry(e
);
346 udev_list_entry_foreach(item
, first
)
347 device_process_path(m
, udev_list_entry_get_name(item
), false);
349 udev_enumerate_unref(e
);
354 udev_enumerate_unref(e
);
360 void device_fd_event(Manager
*m
, int events
) {
361 struct udev_device
*dev
;
366 assert(events
== EPOLLIN
);
368 if (!(dev
= udev_monitor_receive_device(m
->udev_monitor
))) {
369 log_error("Failed to receive device.");
373 if (!(action
= udev_device_get_action(dev
))) {
374 log_error("Failed to get udev action string.");
378 if (streq(action
, "remove")) {
379 if ((r
= device_process_removed_device(m
, dev
)) < 0) {
380 log_error("Failed to process udev device event: %s", strerror(-r
));
384 if ((r
= device_process_new_device(m
, dev
, true)) < 0) {
385 log_error("Failed to process udev device event: %s", strerror(-r
));
391 udev_device_unref(dev
);
394 const UnitVTable device_vtable
= {
397 .init
= unit_load_fragment_and_dropin_optional
,
399 .coldplug
= device_coldplug
,
403 .active_state
= device_active_state
,
405 .enumerate
= device_enumerate
,
406 .shutdown
= device_shutdown