[thirdparty/systemd.git] / src / login / logind-device.c

/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <string.h>

#include "alloc-util.h"
#include "hashmap.h"
#include "logind.h"
#include "logind-device.h"
#include "logind-seat.h"
#include "logind-seat-dbus.h"
#include "logind-session-device.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)
                return mfree(d);

        if (hashmap_put(m->devices, d->sysfs, d) < 0) {
                free(d->sysfs);
                return mfree(d);
        }

        d->manager = m;
        d->master = master;
        dual_timestamp_now(&d->timestamp);

        return d;
}

static 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");
        }
}

void device_free(Device *d) {
        assert(d);

        device_detach(d);

        hashmap_remove(d->manager->devices, d->sysfs);

        free(d->sysfs);
        free(d);
}

void device_attach(Device *d, Seat *s) {
        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 && s->started) {
                seat_save(s);
                seat_send_changed(s, "CanGraphical");
        }
}
Commit	Line	Data
	1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
	2
	3	#include <string.h>
	4
	5	#include "alloc-util.h"
	6	#include "hashmap.h"
	7	#include "logind.h"
	8	#include "logind-device.h"
	9	#include "logind-seat.h"
	10	#include "logind-seat-dbus.h"
	11	#include "logind-session-device.h"
	12
	13	Device* device_new(Manager m, const char sysfs, bool master) {
	14	Device *d;
	15
	16	assert(m);
	17	assert(sysfs);
	18
	19	d = new0(Device, 1);
	20	if (!d)
	21	return NULL;
	22
	23	d->sysfs = strdup(sysfs);
	24	if (!d->sysfs)
	25	return mfree(d);
	26
	27	if (hashmap_put(m->devices, d->sysfs, d) < 0) {
	28	free(d->sysfs);
	29	return mfree(d);
	30	}
	31
	32	d->manager = m;
	33	d->master = master;
	34	dual_timestamp_now(&d->timestamp);
	35
	36	return d;
	37	}
	38
	39	static void device_detach(Device *d) {
	40	Seat *s;
	41	SessionDevice *sd;
	42
	43	assert(d);
	44
	45	if (!d->seat)
	46	return;
	47
	48	while ((sd = d->session_devices))
	49	session_device_free(sd);
	50
	51	s = d->seat;
	52	LIST_REMOVE(devices, d->seat->devices, d);
	53	d->seat = NULL;
	54
	55	if (!seat_has_master_device(s)) {
	56	seat_add_to_gc_queue(s);
	57	seat_send_changed(s, "CanGraphical");
	58	}
	59	}
	60
	61	void device_free(Device *d) {
	62	assert(d);
	63
	64	device_detach(d);
	65
	66	hashmap_remove(d->manager->devices, d->sysfs);
	67
	68	free(d->sysfs);
	69	free(d);
	70	}
	71
	72	void device_attach(Device d, Seat s) {
	73	bool had_master;
	74
	75	assert(d);
	76	assert(s);
	77
	78	if (d->seat == s)
	79	return;
	80
	81	if (d->seat)
	82	device_detach(d);
	83
	84	d->seat = s;
	85	had_master = seat_has_master_device(s);
	86
	87	/* We keep the device list sorted by the "master" flag. That is, master
	88	* devices are at the front, other devices at the tail. As there is no
	89	* way to easily add devices at the list-tail, we need to iterate the
	90	* list to find the first non-master device when adding non-master
	91	* devices. We assume there is only a few (normally 1) master devices
	92	* per seat, so we iterate only a few times. */
	93
	94	if (d->master \|\| !s->devices)
	95	LIST_PREPEND(devices, s->devices, d);
	96	else
	97	LIST_FOREACH(devices, i, s->devices) {
	98	if (!i->devices_next \|\| !i->master) {
	99	LIST_INSERT_AFTER(devices, s->devices, i, d);
	100	break;
	101	}
	102	}
	103
	104	if (!had_master && d->master && s->started) {
	105	seat_save(s);
	106	seat_send_changed(s, "CanGraphical");
	107	}
	108	}