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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2011 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <assert.h>
#include <string.h>
#include "logind-device.h"
#include "util.h"
Device* device_new(Manager *m, const char *sysfs, bool master) {
Device *d;
assert(m);
assert(sysfs);
d = new0(Device, 1);
if (!d)
return NULL;
d->sysfs = strdup(sysfs);
if (!d->sysfs) {
free(d);
return NULL;
}
if (hashmap_put(m->devices, d->sysfs, d) < 0) {
free(d->sysfs);
free(d);
return NULL;
}
d->manager = m;
d->master = master;
dual_timestamp_get(&d->timestamp);
return d;
}
void device_free(Device *d) {
assert(d);
device_detach(d);
hashmap_remove(d->manager->devices, d->sysfs);
free(d->sysfs);
free(d);
}
void device_detach(Device *d) {
Seat *s;
SessionDevice *sd;
assert(d);
if (!d->seat)
return;
while ((sd = d->session_devices))
session_device_free(sd);
s = d->seat;
LIST_REMOVE(devices, d->seat->devices, d);
d->seat = NULL;
if (!seat_has_master_device(s)) {
seat_add_to_gc_queue(s);
seat_send_changed(s, "CanGraphical\0");
}
}
void device_attach(Device *d, Seat *s) {
Device *i;
bool had_master;
assert(d);
assert(s);
if (d->seat == s)
return;
if (d->seat)
device_detach(d);
d->seat = s;
had_master = seat_has_master_device(s);
/* We keep the device list sorted by the "master" flag. That is, master
* devices are at the front, other devices at the tail. As there is no
* way to easily add devices at the list-tail, we need to iterate the
* list to find the first non-master device when adding non-master
* devices. We assume there is only a few (normally 1) master devices
* per seat, so we iterate only a few times. */
if (d->master || !s->devices)
LIST_PREPEND(devices, s->devices, d);
else {
LIST_FOREACH(devices, i, s->devices) {
if (!i->devices_next || !i->master) {
LIST_INSERT_AFTER(devices, s->devices, i, d);
break;
}
}
}
if (!had_master && d->master)
seat_send_changed(s, "CanGraphical\0");
}
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