sd_bus_set_sender, sd_bus_get_sender - Configure default sender for outgoing messages

Description

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_sender(3). 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.

History

sd_bus_set_sender() and sd_bus_get_sender() were added in version 237.

Name

sd_bus_set_sender, sd_bus_get_sender - Configure default sender for outgoing messages

Notes

Functions described here are available as a shared library, which can be compiled against and linked to with the libsystemdpkg-config(1) file. The code described here uses getenv(3), which is declared to be not multi-thread-safe. This means that the code calling the functions described here must not call setenv(3) from a parallel thread. It is recommended to only do calls to setenv() from an early phase of the program when no other threads have been started.

Return Value

On success, these functions return 0 or a positive integer. On failure, they return a negative errno-style error code. Errors 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.