src/login/logind-device.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2011 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  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   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <string.h>
  23
  24 #include "util.h"
  25 #include "logind-device.h"
  26
  27 Device* device_new(Manager *m, const char *sysfs, bool master) {
  28         Device *d;
  29
  30         assert(m);
  31         assert(sysfs);
  32
  33         d = new0(Device, 1);
  34         if (!d)
  35                 return NULL;
  36
  37         d->sysfs = strdup(sysfs);
  38         if (!d->sysfs) {
  39                 free(d);
  40                 return NULL;
  41         }
  42
  43         if (hashmap_put(m->devices, d->sysfs, d) < 0) {
  44                 free(d->sysfs);
  45                 free(d);
  46                 return NULL;
  47         }
  48
  49         d->manager = m;
  50         d->master = master;
  51         dual_timestamp_get(&d->timestamp);
  52
  53         return d;
  54 }
  55
  56 static void device_detach(Device *d) {
  57         Seat *s;
  58         SessionDevice *sd;
  59
  60         assert(d);
  61
  62         if (!d->seat)
  63                 return;
  64
  65         while ((sd = d->session_devices))
  66                 session_device_free(sd);
  67
  68         s = d->seat;
  69         LIST_REMOVE(devices, d->seat->devices, d);
  70         d->seat = NULL;
  71
  72         if (!seat_has_master_device(s)) {
  73                 seat_add_to_gc_queue(s);
  74                 seat_send_changed(s, "CanGraphical", NULL);
  75         }
  76 }
  77
  78 void device_free(Device *d) {
  79         assert(d);
  80
  81         device_detach(d);
  82
  83         hashmap_remove(d->manager->devices, d->sysfs);
  84
  85         free(d->sysfs);
  86         free(d);
  87 }
  88
  89 void device_attach(Device *d, Seat *s) {
  90         Device *i;
  91         bool had_master;
  92
  93         assert(d);
  94         assert(s);
  95
  96         if (d->seat == s)
  97                 return;
  98
  99         if (d->seat)
 100                 device_detach(d);
 101
 102         d->seat = s;
 103         had_master = seat_has_master_device(s);
 104
 105         /* We keep the device list sorted by the "master" flag. That is, master
 106          * devices are at the front, other devices at the tail. As there is no
 107          * way to easily add devices at the list-tail, we need to iterate the
 108          * list to find the first non-master device when adding non-master
 109          * devices. We assume there is only a few (normally 1) master devices
 110          * per seat, so we iterate only a few times. */
 111
 112         if (d->master || !s->devices)
 113                 LIST_PREPEND(devices, s->devices, d);
 114         else {
 115                 LIST_FOREACH(devices, i, s->devices) {
 116                         if (!i->devices_next || !i->master) {
 117                                 LIST_INSERT_AFTER(devices, s->devices, i, d);
 118                                 break;
 119                         }
 120                 }
 121         }
 122
 123         if (!had_master && d->master)
 124                 seat_send_changed(s, "CanGraphical", NULL);
 125 }