1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
/*-*- Mode: C; c-basic-offset: 8 -*-*/
#include <errno.h>
#include <libudev.h>
#include "unit.h"
#include "device.h"
#include "strv.h"
#include "log.h"
static void device_done(Unit *u) {
Device *d = DEVICE(u);
assert(d);
free(d->sysfs);
}
static void device_dump(Unit *u, FILE *f, const char *prefix) {
static const char* const state_table[_DEVICE_STATE_MAX] = {
[DEVICE_DEAD] = "dead",
[DEVICE_AVAILABLE] = "available"
};
Device *d = DEVICE(u);
assert(d);
fprintf(f,
"%sDevice State: %s\n"
"%sSysfs Path: %s\n",
prefix, state_table[d->state],
prefix, d->sysfs);
}
static int device_add_escaped_name(Unit *u, const char *prefix, const char *dn, bool make_id) {
char *e;
int r;
assert(u);
assert(dn);
assert(dn[0] == '/');
if (!(e = unit_name_escape_path(prefix, dn+1, ".device")))
return -ENOMEM;
r = unit_add_name(u, e);
if (r >= 0 && make_id)
unit_choose_id(u, e);
free(e);
if (r < 0 && r != -EEXIST)
return r;
return 0;
}
static int device_process_device(Manager *m, struct udev_device *dev) {
const char *dn, *names, *wants, *sysfs;
Unit *u = NULL;
int r;
char *e, *w, *state;
size_t l;
bool delete;
struct udev_list_entry *item = NULL, *first = NULL;
assert(m);
/* Check whether this entry is even relevant for us. */
dn = udev_device_get_devnode(dev);
names = udev_device_get_property_value(dev, "SYSTEMD_NAMES");
wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS");
if (!dn && !names && !wants)
return 0;
/* Ok, seems kinda interesting. Now, let's see if this one
* already exists. */
if (!(sysfs = udev_device_get_syspath(dev)))
return -ENOMEM;
assert(sysfs[0] == '/');
if (!(e = unit_name_escape_path("sysfs-", sysfs+1, ".device")))
return -ENOMEM;
if (!(u = manager_get_unit(m, e))) {
const char *model;
delete = true;
if (!(u = unit_new(m))) {
free(e);
return -ENOMEM;
}
r = unit_add_name(u, e);
free(e);
if (r < 0)
goto fail;
if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
r = -ENOMEM;
goto fail;
}
if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) ||
(model = udev_device_get_property_value(dev, "ID_MODEL")))
if (!(u->meta.description = strdup(model))) {
r = -ENOMEM;
goto fail;
}
} else {
delete = false;
free(e);
}
if (dn)
if ((r = device_add_escaped_name(u, "node-", dn, true)) < 0)
goto fail;
first = udev_device_get_devlinks_list_entry(dev);
udev_list_entry_foreach(item, first)
if ((r = device_add_escaped_name(u, "node-", udev_list_entry_get_name(item), false)) < 0)
goto fail;
if (names) {
FOREACH_WORD(w, l, names, state) {
if (!(e = strndup(w, l)))
goto fail;
r = unit_add_name(u, e);
free(e);
if (r < 0 && r != -EEXIST)
goto fail;
}
}
if (set_isempty(u->meta.names)) {
r = -EEXIST;
goto fail;
}
if (wants) {
FOREACH_WORD(w, l, wants, state) {
if (!(e = strndup(w, l)))
goto fail;
r = unit_add_dependency_by_name(u, UNIT_WANTS, e);
free(e);
if (r < 0)
goto fail;
}
}
unit_add_to_load_queue(u);
return 0;
fail:
if (delete && u)
unit_free(u);
return r;
}
static int device_process_path(Manager *m, const char *path) {
int r;
struct udev_device *dev;
assert(m);
assert(path);
if (!(dev = udev_device_new_from_syspath(m->udev, path))) {
log_warning("Failed to get udev device object from udev for path %s.", path);
return -ENOMEM;
}
r = device_process_device(m, dev);
udev_device_unref(dev);
return r;
}
static void device_shutdown(Manager *m) {
assert(m);
if (m->udev)
udev_unref(m->udev);
}
static int device_enumerate(Manager *m) {
int r;
struct udev_enumerate *e = NULL;
struct udev_list_entry *item = NULL, *first = NULL;
assert(m);
if (!(m->udev = udev_new()))
return -ENOMEM;
if (!(e = udev_enumerate_new(m->udev))) {
r = -ENOMEM;
goto fail;
}
if (udev_enumerate_scan_devices(e) < 0) {
r = -EIO;
goto fail;
}
first = udev_enumerate_get_list_entry(e);
udev_list_entry_foreach(item, first)
device_process_path(m, udev_list_entry_get_name(item));
udev_enumerate_unref(e);
return 0;
fail:
if (e)
udev_enumerate_unref(e);
device_shutdown(m);
return r;
}
static UnitActiveState device_active_state(Unit *u) {
return DEVICE(u)->state == DEVICE_DEAD ? UNIT_INACTIVE : UNIT_ACTIVE;
}
const UnitVTable device_vtable = {
.suffix = ".device",
.init = unit_load_fragment_and_dropin,
.done = device_done,
.dump = device_dump,
.enumerate = device_enumerate,
.shutdown = device_shutdown,
.active_state = device_active_state
};
|
