_public_ int sd_bus_match_signal_async(
sd_bus *bus,
sd_bus_slot **ret,
const char *sender,
const char *path,
const char *interface,
const char *member,
sd_bus_message_handler_t callback,
sd_bus_message_handler_t install_callback,
void *userdata) {
const char *expression;
assert_return(bus, -EINVAL);
assert_return(bus = bus_resolve(bus), -ENOPKG);
assert_return(!bus_pid_changed(bus), -ECHILD);
assert_return(!sender || service_name_is_valid(sender), -EINVAL);
assert_return(!path || object_path_is_valid(path), -EINVAL);
assert_return(!interface || interface_name_is_valid(interface), -EINVAL);
assert_return(!member || member_name_is_valid(member), -EINVAL);
expression = make_expression(sender, path, interface, member);
return sd_bus_add_match_async(bus, ret, expression, callback, install_callback, userdata);
}
char* object_path_startswith(const char *a, const char *b) {
const char *p;
if (!object_path_is_valid(a) ||
!object_path_is_valid(b))
return NULL;
if (streq(b, "/"))
return (char*) a + 1;
p = startswith(a, b);
if (!p)
return NULL;
if (*p == 0)
return (char*) p;
if (*p == '/')
return (char*) p + 1;
return NULL;
}
