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Initialize monitor's busy status to false if we own the device.

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Bug found by David Henningsson.
This commit is contained in:
Tanu Kaskinen 2013-01-16 03:36:04 +02:00 • committed by David Henningsson
parent dd7cf7ad5e
commit 6be6766b58
1 changed files with 80 additions and 16 deletions
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96
src/modules/reserve-monitor.c
View file

@ -59,6 +59,23 @@ struct rm_monitor {
"member='NameOwnerChanged'," \
"arg0='%s'"
static unsigned get_busy(
DBusConnection *c,
const char *name_owner) {
const char *un;
if (!name_owner || !*name_owner)
return FALSE;
/* If we ourselves own the device, then don't consider this 'busy' */
if ((un = dbus_bus_get_unique_name(c)))
if (strcmp(name_owner, un) == 0)
return FALSE;
return TRUE;
}
static DBusHandlerResult filter_handler(
DBusConnection *c,
DBusMessage *s,
@ -87,16 +104,7 @@ static DBusHandlerResult filter_handler(
if (strcmp(name, m->service_name) == 0) {
unsigned old_busy = m->busy;
m->busy = !!(new && *new);
/* If we ourselves own the device, then don't consider this 'busy' */
if (m->busy) {
const char *un;
if ((un = dbus_bus_get_unique_name(c)))
if (strcmp(new, un) == 0)
m->busy = FALSE;
}
m->busy = get_busy(c, new);
if (m->busy != old_busy && m->change_cb) {
m->ref++;
@ -112,14 +120,71 @@ invalid:
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
static int get_name_owner(
DBusConnection *connection,
const char *name,
char **name_owner,
DBusError *error) {
DBusMessage *msg, *reply;
int r;
*name_owner = NULL;
if (!(msg = dbus_message_new_method_call(DBUS_SERVICE_DBUS, DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS, "GetNameOwner"))) {
r = -ENOMEM;
goto fail;
}
if (!dbus_message_append_args(msg, DBUS_TYPE_STRING, &name, DBUS_TYPE_INVALID)) {
r = -ENOMEM;
goto fail;
}
reply = dbus_connection_send_with_reply_and_block(connection, msg, DBUS_TIMEOUT_USE_DEFAULT, error);
dbus_message_unref(msg);
msg = NULL;
if (reply) {
if (!dbus_message_get_args(reply, error, DBUS_TYPE_STRING, name_owner, DBUS_TYPE_INVALID)) {
dbus_message_unref(reply);
r = -EIO;
goto fail;
}
*name_owner = strdup(*name_owner);
dbus_message_unref(reply);
if (!*name_owner) {
r = -ENOMEM;
goto fail;
}
} else if (dbus_error_has_name(error, "org.freedesktop.DBus.Error.NameHasNoOwner"))
dbus_error_free(error);
else {
r = -EIO;
goto fail;
}
return 0;
fail:
if (msg)
dbus_message_unref(msg);
return r;
}
int rm_watch(
rm_monitor **_m,
DBusConnection *connection,
const char*device_name,
const char *device_name,
rm_change_cb_t change_cb,
DBusError *error) {
rm_monitor *m = NULL;
char *name_owner;
int r;
DBusError _error;
@ -178,12 +243,11 @@ int rm_watch(
m->matching = 1;
m->busy = dbus_bus_name_has_owner(m->connection, m->service_name, error);
if (dbus_error_is_set(error)) {
r = -EIO;
if ((r = get_name_owner(m->connection, m->service_name, &name_owner, error)) < 0)
goto fail;
}
m->busy = get_busy(m->connection, name_owner);
free(name_owner);
*_m = m;
return 0;