4afd3348c7
GLIB has recently started to officially support the gcc cleanup attribute in its public API, hence let's do the same for our APIs. With this patch we'll define an xyz_unrefp() call for each public xyz_unref() call, to make it easy to use inside a __attribute__((cleanup())) expression. Then, all code is ported over to make use of this. The new calls are also documented in the man pages, with examples how to use them (well, I only added docs where the _unref() call itself already had docs, and the examples, only cover sd_bus_unrefp() and sd_event_unrefp()). This also renames sd_lldp_free() to sd_lldp_unref(), since that's how we tend to call our destructors these days. Note that this defines no public macro that wraps gcc's attribute and makes it easier to use. While I think it's our duty in the library to make our stuff easy to use, I figure it's not our duty to make gcc's own features easy to use on its own. Most likely, client code which wants to make use of this should define its own: #define _cleanup_(function) __attribute__((cleanup(function))) Or similar, to make the gcc feature easier to use. Making this logic public has the benefit that we can remove three header files whose only purpose was to define these functions internally. See #2008.
477 lines
14 KiB
C
477 lines
14 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <string.h>
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#include "alloc-util.h"
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#include "bus-common-errors.h"
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#include "bus-label.h"
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#include "bus-util.h"
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#include "logind-seat.h"
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#include "logind.h"
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#include "strv.h"
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#include "user-util.h"
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#include "util.h"
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static int property_get_active_session(
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sd_bus *bus,
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const char *path,
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const char *interface,
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const char *property,
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sd_bus_message *reply,
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void *userdata,
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sd_bus_error *error) {
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_cleanup_free_ char *p = NULL;
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Seat *s = userdata;
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assert(bus);
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assert(reply);
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assert(s);
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p = s->active ? session_bus_path(s->active) : strdup("/");
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if (!p)
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return -ENOMEM;
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return sd_bus_message_append(reply, "(so)", s->active ? s->active->id : "", p);
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}
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static int property_get_can_multi_session(
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sd_bus *bus,
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const char *path,
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const char *interface,
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const char *property,
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sd_bus_message *reply,
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void *userdata,
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sd_bus_error *error) {
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Seat *s = userdata;
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assert(bus);
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assert(reply);
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assert(s);
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return sd_bus_message_append(reply, "b", seat_can_multi_session(s));
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}
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static int property_get_can_tty(
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sd_bus *bus,
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const char *path,
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const char *interface,
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const char *property,
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sd_bus_message *reply,
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void *userdata,
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sd_bus_error *error) {
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Seat *s = userdata;
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assert(bus);
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assert(reply);
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assert(s);
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return sd_bus_message_append(reply, "b", seat_can_tty(s));
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}
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static int property_get_can_graphical(
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sd_bus *bus,
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const char *path,
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const char *interface,
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const char *property,
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sd_bus_message *reply,
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void *userdata,
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sd_bus_error *error) {
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Seat *s = userdata;
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assert(bus);
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assert(reply);
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assert(s);
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return sd_bus_message_append(reply, "b", seat_can_graphical(s));
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}
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static int property_get_sessions(
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sd_bus *bus,
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const char *path,
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const char *interface,
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const char *property,
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sd_bus_message *reply,
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void *userdata,
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sd_bus_error *error) {
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Seat *s = userdata;
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Session *session;
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int r;
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assert(bus);
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assert(reply);
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assert(s);
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r = sd_bus_message_open_container(reply, 'a', "(so)");
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if (r < 0)
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return r;
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LIST_FOREACH(sessions_by_seat, session, s->sessions) {
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_cleanup_free_ char *p = NULL;
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p = session_bus_path(session);
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if (!p)
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return -ENOMEM;
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r = sd_bus_message_append(reply, "(so)", session->id, p);
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if (r < 0)
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return r;
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}
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r = sd_bus_message_close_container(reply);
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if (r < 0)
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return r;
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return 1;
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}
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static int property_get_idle_hint(
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sd_bus *bus,
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const char *path,
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const char *interface,
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const char *property,
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sd_bus_message *reply,
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void *userdata,
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sd_bus_error *error) {
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Seat *s = userdata;
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assert(bus);
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assert(reply);
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assert(s);
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return sd_bus_message_append(reply, "b", seat_get_idle_hint(s, NULL) > 0);
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}
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static int property_get_idle_since_hint(
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sd_bus *bus,
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const char *path,
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const char *interface,
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const char *property,
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sd_bus_message *reply,
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void *userdata,
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sd_bus_error *error) {
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Seat *s = userdata;
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dual_timestamp t;
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uint64_t u;
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int r;
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assert(bus);
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assert(reply);
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assert(s);
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r = seat_get_idle_hint(s, &t);
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if (r < 0)
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return r;
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u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
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return sd_bus_message_append(reply, "t", u);
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}
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int bus_seat_method_terminate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
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Seat *s = userdata;
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int r;
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assert(message);
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assert(s);
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r = bus_verify_polkit_async(
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message,
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CAP_KILL,
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"org.freedesktop.login1.manage",
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NULL,
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false,
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UID_INVALID,
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&s->manager->polkit_registry,
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error);
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if (r < 0)
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return r;
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if (r == 0)
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return 1; /* Will call us back */
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r = seat_stop_sessions(s, true);
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if (r < 0)
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return r;
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return sd_bus_reply_method_return(message, NULL);
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}
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static int method_activate_session(sd_bus_message *message, void *userdata, sd_bus_error *error) {
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Seat *s = userdata;
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const char *name;
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Session *session;
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int r;
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assert(message);
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assert(s);
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r = sd_bus_message_read(message, "s", &name);
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if (r < 0)
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return r;
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session = hashmap_get(s->manager->sessions, name);
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if (!session)
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return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SESSION, "No session '%s' known", name);
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if (session->seat != s)
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return sd_bus_error_setf(error, BUS_ERROR_SESSION_NOT_ON_SEAT, "Session %s not on seat %s", name, s->id);
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r = session_activate(session);
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if (r < 0)
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return r;
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return sd_bus_reply_method_return(message, NULL);
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}
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static int method_switch_to(sd_bus_message *message, void *userdata, sd_bus_error *error) {
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Seat *s = userdata;
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unsigned int to;
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int r;
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assert(message);
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assert(s);
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r = sd_bus_message_read(message, "u", &to);
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if (r < 0)
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return r;
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if (to <= 0)
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return -EINVAL;
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r = seat_switch_to(s, to);
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if (r < 0)
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return r;
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return sd_bus_reply_method_return(message, NULL);
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}
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static int method_switch_to_next(sd_bus_message *message, void *userdata, sd_bus_error *error) {
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Seat *s = userdata;
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int r;
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assert(message);
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assert(s);
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r = seat_switch_to_next(s);
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if (r < 0)
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return r;
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return sd_bus_reply_method_return(message, NULL);
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}
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static int method_switch_to_previous(sd_bus_message *message, void *userdata, sd_bus_error *error) {
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Seat *s = userdata;
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int r;
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assert(message);
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assert(s);
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r = seat_switch_to_previous(s);
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if (r < 0)
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return r;
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return sd_bus_reply_method_return(message, NULL);
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}
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const sd_bus_vtable seat_vtable[] = {
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SD_BUS_VTABLE_START(0),
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SD_BUS_PROPERTY("Id", "s", NULL, offsetof(Seat, id), SD_BUS_VTABLE_PROPERTY_CONST),
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SD_BUS_PROPERTY("ActiveSession", "(so)", property_get_active_session, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
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SD_BUS_PROPERTY("CanMultiSession", "b", property_get_can_multi_session, 0, SD_BUS_VTABLE_PROPERTY_CONST),
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SD_BUS_PROPERTY("CanTTY", "b", property_get_can_tty, 0, SD_BUS_VTABLE_PROPERTY_CONST),
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SD_BUS_PROPERTY("CanGraphical", "b", property_get_can_graphical, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
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SD_BUS_PROPERTY("Sessions", "a(so)", property_get_sessions, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
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SD_BUS_PROPERTY("IdleHint", "b", property_get_idle_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
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SD_BUS_PROPERTY("IdleSinceHint", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
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SD_BUS_PROPERTY("IdleSinceHintMonotonic", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
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SD_BUS_METHOD("Terminate", NULL, NULL, bus_seat_method_terminate, SD_BUS_VTABLE_UNPRIVILEGED),
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SD_BUS_METHOD("ActivateSession", "s", NULL, method_activate_session, SD_BUS_VTABLE_UNPRIVILEGED),
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SD_BUS_METHOD("SwitchTo", "u", NULL, method_switch_to, SD_BUS_VTABLE_UNPRIVILEGED),
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SD_BUS_METHOD("SwitchToNext", NULL, NULL, method_switch_to_next, SD_BUS_VTABLE_UNPRIVILEGED),
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SD_BUS_METHOD("SwitchToPrevious", NULL, NULL, method_switch_to_previous, SD_BUS_VTABLE_UNPRIVILEGED),
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SD_BUS_VTABLE_END
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};
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int seat_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
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Manager *m = userdata;
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Seat *seat;
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int r;
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assert(bus);
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assert(path);
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assert(interface);
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assert(found);
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assert(m);
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if (streq(path, "/org/freedesktop/login1/seat/self")) {
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_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
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sd_bus_message *message;
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Session *session;
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const char *name;
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message = sd_bus_get_current_message(bus);
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if (!message)
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return 0;
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r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_SESSION|SD_BUS_CREDS_AUGMENT, &creds);
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if (r < 0)
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return r;
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r = sd_bus_creds_get_session(creds, &name);
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if (r < 0)
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return r;
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session = hashmap_get(m->sessions, name);
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if (!session)
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return 0;
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seat = session->seat;
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} else {
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_cleanup_free_ char *e = NULL;
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const char *p;
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p = startswith(path, "/org/freedesktop/login1/seat/");
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if (!p)
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return 0;
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e = bus_label_unescape(p);
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if (!e)
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return -ENOMEM;
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seat = hashmap_get(m->seats, e);
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}
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if (!seat)
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return 0;
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*found = seat;
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return 1;
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}
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char *seat_bus_path(Seat *s) {
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_cleanup_free_ char *t = NULL;
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assert(s);
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t = bus_label_escape(s->id);
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if (!t)
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return NULL;
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return strappend("/org/freedesktop/login1/seat/", t);
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}
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int seat_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
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_cleanup_strv_free_ char **l = NULL;
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sd_bus_message *message;
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Manager *m = userdata;
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Seat *seat;
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Iterator i;
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int r;
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assert(bus);
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assert(path);
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assert(nodes);
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HASHMAP_FOREACH(seat, m->seats, i) {
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char *p;
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p = seat_bus_path(seat);
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if (!p)
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return -ENOMEM;
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r = strv_consume(&l, p);
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if (r < 0)
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return r;
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}
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message = sd_bus_get_current_message(bus);
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if (message) {
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_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
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const char *name;
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Session *session;
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r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_SESSION|SD_BUS_CREDS_AUGMENT, &creds);
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if (r >= 0) {
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r = sd_bus_creds_get_session(creds, &name);
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if (r >= 0) {
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session = hashmap_get(m->sessions, name);
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if (session && session->seat) {
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r = strv_extend(&l, "/org/freedesktop/login1/seat/self");
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if (r < 0)
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return r;
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}
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}
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}
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}
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*nodes = l;
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l = NULL;
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return 1;
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}
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int seat_send_signal(Seat *s, bool new_seat) {
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_cleanup_free_ char *p = NULL;
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assert(s);
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p = seat_bus_path(s);
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if (!p)
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return -ENOMEM;
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return sd_bus_emit_signal(
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s->manager->bus,
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"/org/freedesktop/login1",
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"org.freedesktop.login1.Manager",
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new_seat ? "SeatNew" : "SeatRemoved",
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"so", s->id, p);
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}
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int seat_send_changed(Seat *s, const char *properties, ...) {
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_cleanup_free_ char *p = NULL;
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char **l;
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assert(s);
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if (!s->started)
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return 0;
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p = seat_bus_path(s);
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if (!p)
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return -ENOMEM;
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l = strv_from_stdarg_alloca(properties);
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return sd_bus_emit_properties_changed_strv(s->manager->bus, p, "org.freedesktop.login1.Seat", l);
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}
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