1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2 
3 #include <string.h>
4 
5 #include "alloc-util.h"
6 #include "logind-device.h"
7 #include "logind-seat-dbus.h"
8 #include "util.h"
9 
device_new(Manager * m,const char * sysfs,bool master)10 Device* device_new(Manager *m, const char *sysfs, bool master) {
11         Device *d;
12 
13         assert(m);
14         assert(sysfs);
15 
16         d = new0(Device, 1);
17         if (!d)
18                 return NULL;
19 
20         d->sysfs = strdup(sysfs);
21         if (!d->sysfs)
22                 return mfree(d);
23 
24         if (hashmap_put(m->devices, d->sysfs, d) < 0) {
25                 free(d->sysfs);
26                 return mfree(d);
27         }
28 
29         d->manager = m;
30         d->master = master;
31         dual_timestamp_get(&d->timestamp);
32 
33         return d;
34 }
35 
device_detach(Device * d)36 static void device_detach(Device *d) {
37         Seat *s;
38         SessionDevice *sd;
39 
40         assert(d);
41 
42         if (!d->seat)
43                 return;
44 
45         while ((sd = d->session_devices))
46                 session_device_free(sd);
47 
48         s = d->seat;
49         LIST_REMOVE(devices, d->seat->devices, d);
50         d->seat = NULL;
51 
52         if (!seat_has_master_device(s)) {
53                 seat_add_to_gc_queue(s);
54                 seat_send_changed(s, "CanGraphical", NULL);
55         }
56 }
57 
device_free(Device * d)58 void device_free(Device *d) {
59         assert(d);
60 
61         device_detach(d);
62 
63         hashmap_remove(d->manager->devices, d->sysfs);
64 
65         free(d->sysfs);
66         free(d);
67 }
68 
device_attach(Device * d,Seat * s)69 void device_attach(Device *d, Seat *s) {
70         bool had_master;
71 
72         assert(d);
73         assert(s);
74 
75         if (d->seat == s)
76                 return;
77 
78         if (d->seat)
79                 device_detach(d);
80 
81         d->seat = s;
82         had_master = seat_has_master_device(s);
83 
84         /* We keep the device list sorted by the "master" flag. That is, master
85          * devices are at the front, other devices at the tail. As there is no
86          * way to easily add devices at the list-tail, we need to iterate the
87          * list to find the first non-master device when adding non-master
88          * devices. We assume there is only a few (normally 1) master devices
89          * per seat, so we iterate only a few times. */
90 
91         if (d->master || !s->devices)
92                 LIST_PREPEND(devices, s->devices, d);
93         else
94                 LIST_FOREACH(devices, i, s->devices) {
95                         if (!i->devices_next || !i->master) {
96                                 LIST_INSERT_AFTER(devices, s->devices, i, d);
97                                 break;
98                         }
99                 }
100 
101         if (!had_master && d->master && s->started) {
102                 seat_save(s);
103                 seat_send_changed(s, "CanGraphical", NULL);
104         }
105 }
106