<html><body><div>Question regarding sd_bus_add_match (sd-bus.c):<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>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.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>/*Beginning=========================================*/<br>int callback(sd_bus_message *message, void *userdata, sd_bus_error *error) {</div><div> //there should be a lock applied here?<br> if(get_signal_id(userdata) == 1) {<br> //do something<br> }<br>}<br><br>int main(...) {<br> r = sd_bus_add_match(bus, &slot, "type='signal'", test_callback, userdata);<br> int r;<br> sd_bus *bus = NULL;<br> sd_event *event = NULL;<br> sd_bus_slot *slot = NULL;<br><br> r = sd_bus_default_system(&bus);<br> assert(r >= 0);<br><br> r = sd_event_default(&event);<br> assert(r >= 0);<br><br> void *userdata1 = set_signal_id(1);<br> r = sd_bus_add_match(bus, &slot, "type='signal',interface='org.interface2'", callback, userdata1);<br><br> void *userdata2 = set_signal_id(2);<br> r = sd_bus_add_match(bus, &slot, "type='signal',interface='org.interface1'", callback, userdata2);<br><br> r = sd_event_loop(event);<br> assert(r >= 0);</div><div> </div><div> bus = sd_bus_flush_close_unref(bus);<br> slot = sd_bus_slot_unref(slot);<br> event = sd_event_unref(event);<br>}</div><div><br data-mce-bogus="1"></div><div>/*End =========================================*/</div><div><br data-mce-bogus="1"></div><div>I appreciate your help and your time.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Thank you,<br data-mce-bogus="1"></div><div>David J (<a href="mailto:emacsd@icloud.com">emacsd@icloud.com</a>)<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div></body></html>