Question regarding sd_bus_add_match (sd-bus.c):
Is it acceptable (or recommended) to use the same callback for multiple signal
match and then using the userdata parameter to distinguish among the different
signals? See the sample code below for a reference of what I am trying to do.
/*Beginning=========================================*/
int callback(sd_bus_message *message, void *userdata, sd_bus_error *error) {
//there should be a lock applied here?
if(get_signal_id(userdata) == 1) {
//do something
}
}
int main(...) {
r = sd_bus_add_match(bus, &slot, "type='signal'", test_callback, userdata);
int r;
sd_bus *bus = NULL;
sd_event *event = NULL;
sd_bus_slot *slot = NULL;
r = sd_bus_default_system(&bus);
assert(r >= 0);
r = sd_event_default(&event);
assert(r >= 0);
void *userdata1 = set_signal_id(1);
r = sd_bus_add_match(bus, &slot, "type='signal',interface='org.interface2'",
callback, userdata1);
void *userdata2 = set_signal_id(2);
r = sd_bus_add_match(bus, &slot, "type='signal',interface='org.interface1'",
callback, userdata2);
r = sd_event_loop(event);
assert(r >= 0);
bus = sd_bus_flush_close_unref(bus);
slot = sd_bus_slot_unref(slot);
event = sd_event_unref(event);
}
/*End =========================================*/
I appreciate your help and your time.
Thank you,
David J ([email protected])
_______________________________________________
systemd-devel mailing list
[email protected]
https://lists.freedesktop.org/mailman/listinfo/systemd-devel
