Line data    Source code

       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           0 : Device* device_new(Manager *m, const char *sysfs, bool master) {
      28             :         Device *d;
      29             : 
      30           0 :         assert(m);
      31           0 :         assert(sysfs);
      32             : 
      33           0 :         d = new0(Device, 1);
      34           0 :         if (!d)
      35           0 :                 return NULL;
      36             : 
      37           0 :         d->sysfs = strdup(sysfs);
      38           0 :         if (!d->sysfs) {
      39           0 :                 free(d);
      40           0 :                 return NULL;
      41             :         }
      42             : 
      43           0 :         if (hashmap_put(m->devices, d->sysfs, d) < 0) {
      44           0 :                 free(d->sysfs);
      45           0 :                 free(d);
      46           0 :                 return NULL;
      47             :         }
      48             : 
      49           0 :         d->manager = m;
      50           0 :         d->master = master;
      51           0 :         dual_timestamp_get(&d->timestamp);
      52             : 
      53           0 :         return d;
      54             : }
      55             : 
      56           0 : static void device_detach(Device *d) {
      57             :         Seat *s;
      58             :         SessionDevice *sd;
      59             : 
      60           0 :         assert(d);
      61             : 
      62           0 :         if (!d->seat)
      63           0 :                 return;
      64             : 
      65           0 :         while ((sd = d->session_devices))
      66           0 :                 session_device_free(sd);
      67             : 
      68           0 :         s = d->seat;
      69           0 :         LIST_REMOVE(devices, d->seat->devices, d);
      70           0 :         d->seat = NULL;
      71             : 
      72           0 :         if (!seat_has_master_device(s)) {
      73           0 :                 seat_add_to_gc_queue(s);
      74           0 :                 seat_send_changed(s, "CanGraphical", NULL);
      75             :         }
      76             : }
      77             : 
      78           0 : void device_free(Device *d) {
      79           0 :         assert(d);
      80             : 
      81           0 :         device_detach(d);
      82             : 
      83           0 :         hashmap_remove(d->manager->devices, d->sysfs);
      84             : 
      85           0 :         free(d->sysfs);
      86           0 :         free(d);
      87           0 : }
      88             : 
      89           0 : void device_attach(Device *d, Seat *s) {
      90             :         Device *i;
      91             :         bool had_master;
      92             : 
      93           0 :         assert(d);
      94           0 :         assert(s);
      95             : 
      96           0 :         if (d->seat == s)
      97           0 :                 return;
      98             : 
      99           0 :         if (d->seat)
     100           0 :                 device_detach(d);
     101             : 
     102           0 :         d->seat = s;
     103           0 :         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           0 :         if (d->master || !s->devices)
     113           0 :                 LIST_PREPEND(devices, s->devices, d);
     114             :         else {
     115           0 :                 LIST_FOREACH(devices, i, s->devices) {
     116           0 :                         if (!i->devices_next || !i->master) {
     117           0 :                                 LIST_INSERT_AFTER(devices, s->devices, i, d);
     118           0 :                                 break;
     119             :                         }
     120             :                 }
     121             :         }
     122             : 
     123           0 :         if (!had_master && d->master)
     124           0 :                 seat_send_changed(s, "CanGraphical", NULL);
     125             : }