systemd sd_bus_set_sender 3 sd_bus_set_sender sd_bus_get_sender Configure default sender for outgoing messages #include <systemd/sd-bus.h> int sd_bus_set_sender sd_bus *bus const char* name int sd_bus_get_sender sd_bus *bus const char** name sd_bus_set_sender() configures the default sender service name to use for outgoing messages. The service name specified in the name parameter is set on all outgoing messages that are sent on the connection and have no sender set yet, for example through sd_bus_message_set_sender3. Note that this function is only supported on direct connections, i.e. not on connections to a bus broker as the broker will fill in the sender service name automatically anyway. By default no sender name is configured, and hence messages are sent without sender field set. If the name parameter is specified as NULL the default sender service name is cleared, returning to the default state if a default sender service name was set before. If passed as non-NULL the specified name must be a valid unique or well-known service name. sd_bus_get_sender() may be used to query the current default service name for outgoing messages. On success, these functions return 0 or a positive integer. On failure, they return a negative errno-style error code. Returned errors may indicate the following problems: -ECHILD The bus connection has been created in a different process, library or module instance. -EPERM The specified bus connection object is a not a direct but a brokered connection. sd_bus_set_sender() and sd_bus_get_sender() were added in version 237. systemd1 sd-bus3 sd_bus_message_set_sender3