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_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.
On success, these functions return 0 or a positive integer. On failure, they return a negative errno-style error code.
Functions described here are available as a shared
library, which can be compiled against and linked to with the
libsystemd pkg-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.