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|
/*
* Seats
*
* Copyright (c) 2012 David Herrmann <dh.herrmann@googlemail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* Seats
* A seat is a single session that is self-hosting and provides all the
* interaction for a single logged-in user.
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "conf.h"
#include "eloop.h"
#include "kmscon_cdev.h"
#include "kmscon_conf.h"
#include "kmscon_dummy.h"
#include "kmscon_seat.h"
#include "kmscon_terminal.h"
#include "shl_dlist.h"
#include "shl_log.h"
#include "uterm_input.h"
#include "uterm_video.h"
#include "uterm_vt.h"
#define LOG_SUBSYSTEM "seat"
struct kmscon_session {
struct shl_dlist list;
unsigned long ref;
struct kmscon_seat *seat;
bool enabled;
bool foreground;
bool deactivating;
struct ev_timer *timer;
kmscon_session_cb_t cb;
void *data;
};
struct kmscon_display {
struct shl_dlist list;
struct kmscon_seat *seat;
struct uterm_display *disp;
bool activated;
};
enum kmscon_async_schedule {
SCHEDULE_SWITCH,
SCHEDULE_VT,
SCHEDULE_UNREGISTER,
};
struct kmscon_seat {
struct ev_eloop *eloop;
struct uterm_vt_master *vtm;
struct conf_ctx *conf_ctx;
struct kmscon_conf_t *conf;
char *name;
struct uterm_input *input;
struct uterm_vt *vt;
struct shl_dlist displays;
size_t session_count;
struct shl_dlist sessions;
bool awake;
bool foreground;
struct kmscon_session *current_sess;
struct kmscon_session *scheduled_sess;
struct kmscon_session *dummy_sess;
unsigned int async_schedule;
kmscon_seat_cb_t cb;
void *data;
};
static int session_call(struct kmscon_session *sess, unsigned int event,
struct uterm_display *disp)
{
struct kmscon_session_event ev;
if (!sess->cb)
return 0;
memset(&ev, 0, sizeof(ev));
ev.type = event;
ev.disp = disp;
return sess->cb(sess, &ev, sess->data);
}
static int session_call_activate(struct kmscon_session *sess)
{
log_debug("activate session %p", sess);
return session_call(sess, KMSCON_SESSION_ACTIVATE, NULL);
}
static int session_call_deactivate(struct kmscon_session *sess)
{
log_debug("deactivate session %p", sess);
return session_call(sess, KMSCON_SESSION_DEACTIVATE, NULL);
}
static void session_call_display_new(struct kmscon_session *sess,
struct uterm_display *disp)
{
session_call(sess, KMSCON_SESSION_DISPLAY_NEW, disp);
}
static void session_call_display_gone(struct kmscon_session *sess,
struct uterm_display *disp)
{
session_call(sess, KMSCON_SESSION_DISPLAY_GONE, disp);
}
static void session_call_display_refresh(struct kmscon_session *sess,
struct uterm_display *disp)
{
session_call(sess, KMSCON_SESSION_DISPLAY_REFRESH, disp);
}
static void activate_display(struct kmscon_display *d)
{
int ret;
struct shl_dlist *iter, *tmp;
struct kmscon_session *s;
struct kmscon_seat *seat = d->seat;
if (d->activated || !d->seat->awake || !d->seat->foreground)
return;
/* TODO: We always use the default mode for new displays but we should
* rather allow the user to specify different modes in the configuration
* files. */
if (uterm_display_get_state(d->disp) == UTERM_DISPLAY_INACTIVE) {
ret = uterm_display_activate(d->disp, NULL);
if (ret)
return;
d->activated = true;
ret = uterm_display_set_dpms(d->disp, UTERM_DPMS_ON);
if (ret)
log_warning("cannot set DPMS state to on for display: %d",
ret);
shl_dlist_for_each_safe(iter, tmp, &seat->sessions) {
s = shl_dlist_entry(iter, struct kmscon_session, list);
session_call_display_new(s, d->disp);
}
}
}
static int seat_go_foreground(struct kmscon_seat *seat, bool force)
{
int ret;
struct shl_dlist *iter;
struct kmscon_display *d;
if (seat->foreground)
return 0;
if (!seat->awake || (!force && seat->current_sess))
return -EBUSY;
if (seat->cb) {
ret = seat->cb(seat, KMSCON_SEAT_FOREGROUND, seat->data);
if (ret) {
log_warning("cannot put seat %s into foreground: %d",
seat->name, ret);
return ret;
}
}
seat->foreground = true;
shl_dlist_for_each(iter, &seat->displays) {
d = shl_dlist_entry(iter, struct kmscon_display, list);
activate_display(d);
}
return 0;
}
static int seat_go_background(struct kmscon_seat *seat, bool force)
{
int ret;
if (!seat->foreground)
return 0;
if (!seat->awake || (!force && seat->current_sess))
return -EBUSY;
if (seat->cb) {
ret = seat->cb(seat, KMSCON_SEAT_BACKGROUND, seat->data);
if (ret) {
log_warning("cannot put seat %s into background: %d",
seat->name, ret);
return ret;
}
}
seat->foreground = false;
return 0;
}
static int seat_go_asleep(struct kmscon_seat *seat, bool force)
{
int ret, err = 0;
if (!seat->awake)
return 0;
if (seat->current_sess || seat->foreground) {
if (force) {
seat->foreground = false;
seat->current_sess = NULL;
err = -EBUSY;
} else {
return -EBUSY;
}
}
if (seat->cb) {
ret = seat->cb(seat, KMSCON_SEAT_SLEEP, seat->data);
if (ret) {
log_warning("cannot put seat %s asleep: %d",
seat->name, ret);
if (!force)
return ret;
}
}
seat->awake = false;
uterm_input_sleep(seat->input);
return err;
}
static int seat_go_awake(struct kmscon_seat *seat)
{
int ret;
if (seat->awake)
return 0;
if (seat->cb) {
ret = seat->cb(seat, KMSCON_SEAT_WAKE_UP, seat->data);
if (ret) {
log_warning("cannot wake up seat %s: %d", seat->name,
ret);
return ret;
}
}
seat->awake = true;
uterm_input_wake_up(seat->input);
return 0;
}
static int seat_run(struct kmscon_seat *seat)
{
int ret;
struct kmscon_session *session;
if (!seat->awake)
return -EBUSY;
if (seat->current_sess)
return 0;
if (!seat->scheduled_sess) {
log_debug("no session scheduled to run (num %zu)",
seat->session_count);
return -ENOENT;
}
session = seat->scheduled_sess;
if (session->foreground && !seat->foreground) {
ret = seat_go_foreground(seat, false);
if (ret) {
log_warning("cannot put seat %s into foreground for session %p",
seat->name, session);
return ret;
}
} else if (!session->foreground && seat->foreground) {
ret = seat_go_background(seat, false);
if (ret) {
log_warning("cannot put seat %s into background for session %p",
seat->name, session);
return ret;
}
}
ret = session_call_activate(session);
if (ret) {
log_warning("cannot activate session %p: %d", session, ret);
return ret;
}
seat->current_sess = session;
return 0;
}
static void session_deactivate(struct kmscon_session *sess)
{
if (sess->seat->current_sess != sess)
return;
sess->seat->async_schedule = SCHEDULE_SWITCH;
sess->deactivating = false;
sess->seat->current_sess = NULL;
}
static int seat_pause(struct kmscon_seat *seat, bool force)
{
int ret;
if (!seat->current_sess)
return 0;
seat->current_sess->deactivating = true;
ret = session_call_deactivate(seat->current_sess);
if (ret) {
if (ret == -EINPROGRESS)
log_debug("pending deactivation for session %p",
seat->current_sess);
else
log_warning("cannot deactivate session %p: %d",
seat->current_sess, ret);
if (!force)
return ret;
}
session_deactivate(seat->current_sess);
return ret;
}
static void seat_reschedule(struct kmscon_seat *seat)
{
struct shl_dlist *iter, *start;
struct kmscon_session *sess;
if (seat->scheduled_sess && seat->scheduled_sess->enabled)
return;
if (seat->current_sess && seat->current_sess->enabled) {
seat->scheduled_sess = seat->current_sess;
return;
}
if (seat->current_sess)
start = &seat->current_sess->list;
else
start = &seat->sessions;
shl_dlist_for_each_but_one(iter, start, &seat->sessions) {
sess = shl_dlist_entry(iter, struct kmscon_session, list);
if (sess == seat->dummy_sess || !sess->enabled)
continue;
seat->scheduled_sess = sess;
return;
}
if (seat->dummy_sess && seat->dummy_sess->enabled)
seat->scheduled_sess = seat->dummy_sess;
else
seat->scheduled_sess = NULL;
}
static bool seat_has_schedule(struct kmscon_seat *seat)
{
return seat->scheduled_sess &&
seat->scheduled_sess != seat->current_sess;
}
static int seat_switch(struct kmscon_seat *seat)
{
int ret;
seat->async_schedule = SCHEDULE_SWITCH;
ret = seat_pause(seat, false);
if (ret)
return ret;
return seat_run(seat);
}
static void seat_next(struct kmscon_seat *seat)
{
struct shl_dlist *cur, *iter;
struct kmscon_session *s, *next;
if (seat->current_sess)
cur = &seat->current_sess->list;
else if (seat->session_count)
cur = &seat->sessions;
else
return;
next = NULL;
if (!seat->current_sess && seat->dummy_sess &&
seat->dummy_sess->enabled)
next = seat->dummy_sess;
shl_dlist_for_each_but_one(iter, cur, &seat->sessions) {
s = shl_dlist_entry(iter, struct kmscon_session, list);
if (!s->enabled || seat->dummy_sess == s)
continue;
next = s;
break;
}
if (!next)
return;
seat->scheduled_sess = next;
seat_switch(seat);
}
static void seat_prev(struct kmscon_seat *seat)
{
struct shl_dlist *cur, *iter;
struct kmscon_session *s, *prev;
if (seat->current_sess)
cur = &seat->current_sess->list;
else if (seat->session_count)
cur = &seat->sessions;
else
return;
prev = NULL;
if (!seat->current_sess && seat->dummy_sess &&
seat->dummy_sess->enabled)
prev = seat->dummy_sess;
shl_dlist_for_each_reverse_but_one(iter, cur, &seat->sessions) {
s = shl_dlist_entry(iter, struct kmscon_session, list);
if (!s->enabled || seat->dummy_sess == s)
continue;
prev = s;
break;
}
if (!prev)
return;
seat->scheduled_sess = prev;
seat_switch(seat);
}
static int seat_add_display(struct kmscon_seat *seat,
struct uterm_display *disp)
{
struct kmscon_display *d;
log_debug("add display %p to seat %s", disp, seat->name);
d = malloc(sizeof(*d));
if (!d)
return -ENOMEM;
memset(d, 0, sizeof(*d));
d->disp = disp;
d->seat = seat;
uterm_display_ref(d->disp);
shl_dlist_link(&seat->displays, &d->list);
activate_display(d);
return 0;
}
static void seat_remove_display(struct kmscon_seat *seat,
struct kmscon_display *d)
{
struct shl_dlist *iter, *tmp;
struct kmscon_session *s;
log_debug("remove display %p from seat %s", d->disp, seat->name);
shl_dlist_unlink(&d->list);
if (d->activated) {
shl_dlist_for_each_safe(iter, tmp, &seat->sessions) {
s = shl_dlist_entry(iter, struct kmscon_session, list);
session_call_display_gone(s, d->disp);
}
}
uterm_display_unref(d->disp);
free(d);
}
static void seat_refresh_display(struct kmscon_seat *seat,
struct kmscon_display *d)
{
struct shl_dlist *iter;
struct kmscon_session *s;
log_debug("refresh display %p from seat %s", d->disp, seat->name);
if (d->activated) {
shl_dlist_for_each(iter, &seat->sessions) {
s = shl_dlist_entry(iter, struct kmscon_session, list);
session_call_display_refresh(s, d->disp);
}
}
}
static int seat_vt_event(struct uterm_vt *vt, struct uterm_vt_event *ev,
void *data)
{
struct kmscon_seat *seat = data;
int ret;
switch (ev->action) {
case UTERM_VT_ACTIVATE:
ret = seat_go_awake(seat);
if (ret)
return ret;
seat_run(seat);
break;
case UTERM_VT_DEACTIVATE:
seat->async_schedule = SCHEDULE_VT;
ret = seat_pause(seat, false);
if (ret)
return ret;
ret = seat_go_background(seat, false);
if (ret)
return ret;
ret = seat_go_asleep(seat, false);
if (ret)
return ret;
break;
case UTERM_VT_HUP:
if (seat->cb)
seat->cb(seat, KMSCON_SEAT_HUP, seat->data);
break;
}
return 0;
}
static void seat_input_event(struct uterm_input *input,
struct uterm_input_event *ev,
void *data)
{
struct kmscon_seat *seat = data;
struct kmscon_session *s;
int ret;
if (ev->handled || !seat->awake)
return;
if (conf_grab_matches(seat->conf->grab_session_next,
ev->mods, ev->num_syms, ev->keysyms)) {
ev->handled = true;
if (!seat->conf->session_control)
return;
seat_next(seat);
return;
}
if (conf_grab_matches(seat->conf->grab_session_prev,
ev->mods, ev->num_syms, ev->keysyms)) {
ev->handled = true;
if (!seat->conf->session_control)
return;
seat_prev(seat);
return;
}
if (conf_grab_matches(seat->conf->grab_session_dummy,
ev->mods, ev->num_syms, ev->keysyms)) {
ev->handled = true;
if (!seat->conf->session_control)
return;
seat->scheduled_sess = seat->dummy_sess;
seat_switch(seat);
return;
}
if (conf_grab_matches(seat->conf->grab_session_close,
ev->mods, ev->num_syms, ev->keysyms)) {
ev->handled = true;
if (!seat->conf->session_control)
return;
s = seat->current_sess;
if (!s)
return;
if (s == seat->dummy_sess)
return;
/* First time this is invoked on a session, we simply try
* unloading it. If it fails, we give it some time. If this is
* invoked a second time, we notice that we already tried
* removing it and so we go straight to unregistering the
* session unconditionally. */
if (!s->deactivating) {
seat->async_schedule = SCHEDULE_UNREGISTER;
ret = seat_pause(seat, false);
if (ret)
return;
}
kmscon_session_unregister(s);
return;
}
if (conf_grab_matches(seat->conf->grab_terminal_new,
ev->mods, ev->num_syms, ev->keysyms)) {
ev->handled = true;
if (!seat->conf->session_control)
return;
ret = kmscon_terminal_register(&s, seat,
uterm_vt_get_num(seat->vt));
if (ret == -EOPNOTSUPP) {
log_notice("terminal support not compiled in");
} else if (ret) {
log_error("cannot register terminal session: %d", ret);
} else {
s->enabled = true;
seat->scheduled_sess = s;
seat_switch(seat);
}
return;
}
}
int kmscon_seat_new(struct kmscon_seat **out,
struct conf_ctx *main_conf,
struct ev_eloop *eloop,
struct uterm_vt_master *vtm,
unsigned int vt_types,
const char *seatname,
kmscon_seat_cb_t cb,
void *data)
{
struct kmscon_seat *seat;
int ret;
char *keymap;
if (!out || !eloop || !vtm || !seatname)
return -EINVAL;
seat = malloc(sizeof(*seat));
if (!seat)
return -ENOMEM;
memset(seat, 0, sizeof(*seat));
seat->eloop = eloop;
seat->vtm = vtm;
seat->cb = cb;
seat->data = data;
shl_dlist_init(&seat->displays);
shl_dlist_init(&seat->sessions);
seat->name = strdup(seatname);
if (!seat->name) {
log_error("cannot copy string");
ret = -ENOMEM;
goto err_free;
}
ret = kmscon_conf_new(&seat->conf_ctx);
if (ret) {
log_error("cannot create seat configuration object: %d", ret);
goto err_name;
}
seat->conf = conf_ctx_get_mem(seat->conf_ctx);
ret = kmscon_conf_load_seat(seat->conf_ctx, main_conf, seat->name);
if (ret) {
log_error("cannot parse seat configuration on seat %s: %d",
seat->name, ret);
goto err_conf;
}
/* TODO: The XKB-API currently requires zero-terminated strings as
* keymap input. Hence, we have to read it in instead of using mmap().
* We should fix this upstream! */
keymap = NULL;
if (seat->conf->xkb_keymap && *seat->conf->xkb_keymap) {
ret = shl_read_file(seat->conf->xkb_keymap, &keymap, NULL);
if (ret)
log_error("cannot read keymap file %s: %d",
seat->conf->xkb_keymap, ret);
}
ret = uterm_input_new(&seat->input, seat->eloop,
seat->conf->xkb_model,
seat->conf->xkb_layout,
seat->conf->xkb_variant,
seat->conf->xkb_options,
keymap,
seat->conf->xkb_repeat_delay,
seat->conf->xkb_repeat_rate);
free(keymap);
if (ret)
goto err_conf;
ret = uterm_input_register_cb(seat->input, seat_input_event, seat);
if (ret)
goto err_input;
ret = uterm_vt_allocate(seat->vtm, &seat->vt,
vt_types, seat->name,
seat->input, seat->conf->vt, seat_vt_event,
seat);
if (ret)
goto err_input_cb;
ev_eloop_ref(seat->eloop);
uterm_vt_master_ref(seat->vtm);
*out = seat;
return 0;
err_input_cb:
uterm_input_unregister_cb(seat->input, seat_input_event, seat);
err_input:
uterm_input_unref(seat->input);
err_conf:
kmscon_conf_free(seat->conf_ctx);
err_name:
free(seat->name);
err_free:
free(seat);
return ret;
}
void kmscon_seat_free(struct kmscon_seat *seat)
{
struct kmscon_display *d;
struct kmscon_session *s;
int ret;
if (!seat)
return;
ret = seat_pause(seat, true);
if (ret)
log_warning("destroying seat %s while session %p is active",
seat->name, seat->current_sess);
ret = seat_go_asleep(seat, true);
if (ret)
log_warning("destroying seat %s while still awake: %d",
seat->name, ret);
while (!shl_dlist_empty(&seat->sessions)) {
s = shl_dlist_entry(seat->sessions.next,
struct kmscon_session,
list);
kmscon_session_unregister(s);
}
while (!shl_dlist_empty(&seat->displays)) {
d = shl_dlist_entry(seat->displays.next,
struct kmscon_display,
list);
seat_remove_display(seat, d);
}
uterm_vt_deallocate(seat->vt);
uterm_input_unregister_cb(seat->input, seat_input_event, seat);
uterm_input_unref(seat->input);
kmscon_conf_free(seat->conf_ctx);
free(seat->name);
uterm_vt_master_unref(seat->vtm);
ev_eloop_unref(seat->eloop);
free(seat);
}
void kmscon_seat_startup(struct kmscon_seat *seat)
{
int ret;
struct kmscon_session *s;
if (!seat)
return;
ret = kmscon_dummy_register(&s, seat);
if (ret == -EOPNOTSUPP) {
log_notice("dummy sessions not compiled in");
} else if (ret) {
log_error("cannot register dummy session: %d", ret);
} else {
seat->dummy_sess = s;
kmscon_session_enable(s);
}
if (seat->conf->terminal_session) {
ret = kmscon_terminal_register(&s, seat,
uterm_vt_get_num(seat->vt));
if (ret == -EOPNOTSUPP)
log_notice("terminal support not compiled in");
else if (ret)
log_error("cannot register terminal session");
else
kmscon_session_enable(s);
}
if (seat->conf->cdev_session) {
ret = kmscon_cdev_register(&s, seat);
if (ret == -EOPNOTSUPP)
log_notice("cdev sessions not compiled in");
else if (ret)
log_error("cannot register cdev session");
}
if (seat->conf->switchvt ||
uterm_vt_get_type(seat->vt) == UTERM_VT_FAKE)
uterm_vt_activate(seat->vt);
}
int kmscon_seat_add_display(struct kmscon_seat *seat,
struct uterm_display *disp)
{
if (!seat || !disp)
return -EINVAL;
return seat_add_display(seat, disp);
}
void kmscon_seat_remove_display(struct kmscon_seat *seat,
struct uterm_display *disp)
{
struct shl_dlist *iter;
struct kmscon_display *d;
if (!seat || !disp)
return;
shl_dlist_for_each(iter, &seat->displays) {
d = shl_dlist_entry(iter, struct kmscon_display, list);
if (d->disp != disp)
continue;
seat_remove_display(seat, d);
break;
}
}
void kmscon_seat_refresh_display(struct kmscon_seat *seat,
struct uterm_display *disp)
{
struct shl_dlist *iter;
struct kmscon_display *d;
if (!seat || !disp)
return;
shl_dlist_for_each(iter, &seat->displays) {
d = shl_dlist_entry(iter, struct kmscon_display, list);
if (d->disp != disp)
continue;
seat_refresh_display(seat, d);
break;
}
}
int kmscon_seat_add_input(struct kmscon_seat *seat, const char *node)
{
if (!seat || !node)
return -EINVAL;
uterm_input_add_dev(seat->input, node);
return 0;
}
void kmscon_seat_remove_input(struct kmscon_seat *seat, const char *node)
{
if (!seat || !node)
return;
uterm_input_remove_dev(seat->input, node);
}
const char *kmscon_seat_get_name(struct kmscon_seat *seat)
{
if (!seat)
return NULL;
return seat->name;
}
struct uterm_input *kmscon_seat_get_input(struct kmscon_seat *seat)
{
if (!seat)
return NULL;
return seat->input;
}
struct ev_eloop *kmscon_seat_get_eloop(struct kmscon_seat *seat)
{
if (!seat)
return NULL;
return seat->eloop;
}
struct conf_ctx *kmscon_seat_get_conf(struct kmscon_seat *seat)
{
if (!seat)
return NULL;
return seat->conf_ctx;
}
void kmscon_seat_schedule(struct kmscon_seat *seat, unsigned int id)
{
struct shl_dlist *iter;
struct kmscon_session *s, *next;
if (!seat)
return;
next = seat->dummy_sess;
shl_dlist_for_each(iter, &seat->sessions) {
s = shl_dlist_entry(iter, struct kmscon_session, list);
if (!s->enabled || seat->dummy_sess == s ||
seat->current_sess == s)
continue;
next = s;
if (!id--)
break;
}
seat->scheduled_sess = next;
if (seat_has_schedule(seat))
seat_switch(seat);
}
int kmscon_seat_register_session(struct kmscon_seat *seat,
struct kmscon_session **out,
kmscon_session_cb_t cb,
void *data)
{
struct kmscon_session *sess;
struct shl_dlist *iter;
struct kmscon_display *d;
if (!seat || !out)
return -EINVAL;
if (seat->conf->session_max &&
seat->session_count >= seat->conf->session_max) {
log_warning("maximum number of sessions reached (%d), dropping new session",
seat->conf->session_max);
return -EOVERFLOW;
}
sess = malloc(sizeof(*sess));
if (!sess) {
log_error("cannot allocate memory for new session on seat %s",
seat->name);
return -ENOMEM;
}
log_debug("register session %p", sess);
memset(sess, 0, sizeof(*sess));
sess->ref = 1;
sess->seat = seat;
sess->cb = cb;
sess->data = data;
sess->foreground = true;
/* register new sessions next to the current one */
if (seat->current_sess)
shl_dlist_link(&seat->current_sess->list, &sess->list);
else
shl_dlist_link_tail(&seat->sessions, &sess->list);
++seat->session_count;
*out = sess;
shl_dlist_for_each(iter, &seat->displays) {
d = shl_dlist_entry(iter, struct kmscon_display, list);
session_call_display_new(sess, d->disp);
}
return 0;
}
void kmscon_session_ref(struct kmscon_session *sess)
{
if (!sess || !sess->ref)
return;
++sess->ref;
}
void kmscon_session_unref(struct kmscon_session *sess)
{
if (!sess || !sess->ref || --sess->ref)
return;
kmscon_session_unregister(sess);
free(sess);
}
void kmscon_session_unregister(struct kmscon_session *sess)
{
struct kmscon_seat *seat;
int ret;
bool forced = false;
if (!sess || !sess->seat)
return;
log_debug("unregister session %p", sess);
seat = sess->seat;
sess->enabled = false;
if (seat->dummy_sess == sess)
seat->dummy_sess = NULL;
seat_reschedule(seat);
if (seat->current_sess == sess) {
ret = seat_pause(seat, true);
if (ret) {
forced = true;
log_warning("unregistering active session %p; skipping automatic session-switch",
sess);
}
}
shl_dlist_unlink(&sess->list);
--seat->session_count;
sess->seat = NULL;
session_call(sess, KMSCON_SESSION_UNREGISTER, NULL);
kmscon_session_unref(sess);
/* If this session was active and we couldn't deactivate it, then it
* might still have resources allocated that couldn't get freed. In this
* case we should not automatically switch to the next session as it is
* very likely that it will not be able to start.
* Instead, we stay inactive and wait for user/external input to switch
* to another session. This delay will then hopefully be long enough so
* all resources got freed. */
if (!forced)
seat_run(seat);
}
bool kmscon_session_is_registered(struct kmscon_session *sess)
{
return sess && sess->seat;
}
bool kmscon_session_is_active(struct kmscon_session *sess)
{
return sess && sess->seat && sess->seat->current_sess == sess;
}
int kmscon_session_set_foreground(struct kmscon_session *sess)
{
struct kmscon_seat *seat;
int ret;
if (!sess)
return -EINVAL;
if (sess->foreground)
return 0;
seat = sess->seat;
if (seat && seat->current_sess == sess && !seat->foreground) {
ret = seat_go_foreground(seat, true);
if (ret)
return ret;
}
sess->foreground = true;
return 0;
}
int kmscon_session_set_background(struct kmscon_session *sess)
{
struct kmscon_seat *seat;
int ret;
if (!sess)
return -EINVAL;
if (!sess->foreground)
return 0;
seat = sess->seat;
if (seat && seat->current_sess == sess && seat->foreground) {
ret = seat_go_background(seat, true);
if (ret)
return ret;
}
sess->foreground = false;
return 0;
}
void kmscon_session_schedule(struct kmscon_session *sess)
{
struct kmscon_seat *seat;
if (!sess || !sess->seat)
return;
seat = sess->seat;
seat->scheduled_sess = sess;
seat_reschedule(seat);
if (seat_has_schedule(seat))
seat_switch(seat);
}
void kmscon_session_enable(struct kmscon_session *sess)
{
if (!sess || sess->enabled)
return;
log_debug("enable session %p", sess);
sess->enabled = true;
if (sess->seat &&
(!sess->seat->current_sess ||
sess->seat->current_sess == sess->seat->dummy_sess)) {
sess->seat->scheduled_sess = sess;
if (seat_has_schedule(sess->seat))
seat_switch(sess->seat);
}
}
void kmscon_session_disable(struct kmscon_session *sess)
{
if (!sess || !sess->enabled)
return;
log_debug("disable session %p", sess);
sess->enabled = false;
}
bool kmscon_session_is_enabled(struct kmscon_session *sess)
{
return sess && sess->enabled;
}
void kmscon_session_notify_deactivated(struct kmscon_session *sess)
{
struct kmscon_seat *seat;
int ret;
unsigned int sched;
if (!sess || !sess->seat)
return;
seat = sess->seat;
if (seat->current_sess != sess)
return;
sched = seat->async_schedule;
log_debug("session %p notified core about deactivation (schedule: %u)",
sess, sched);
session_deactivate(sess);
seat_reschedule(seat);
if (sched == SCHEDULE_VT) {
ret = seat_go_background(seat, false);
if (ret)
return;
ret = seat_go_asleep(seat, false);
if (ret)
return;
uterm_vt_retry(seat->vt);
} else if (sched == SCHEDULE_UNREGISTER) {
kmscon_session_unregister(sess);
} else {
seat_switch(seat);
}
}
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