sd_bus_set_sender - Man Page
Configure default sender for outgoing messages
Synopsis
#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);
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.
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.
Notes
Functions described here are available as a shared library, which can be compiled against and linked to with the libsystemd pkg-config(1) file.
All functions listed here are thread-agnostic and only a single thread may operate on a given object at any given time. Different threads may access the same object at different times. Multiple independent objects may be used from different threads in parallel.
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.
History
sd_bus_set_sender() and sd_bus_get_sender() were added in version 237.