sd_bus_request_name, sd_bus_release_name — Request or release a well-known service name on a bus
|const char *name,|
|const char *name|
sd_bus_request_name() requests a
well-known service name on a bus. It takes a bus connection, a
valid bus name and a flags parameter. The flags parameter is a
combination of the following flags:
After acquiring the name successfully, permit
other peers to take over the name when they try to acquire it
not set on the original request, such a request by other peers
will be denied.
Take over the name if it is already acquired
by another peer, and that other peer has permitted takeover by
Queue the acquisition of the name when the name is already taken.
sd_bus_release_name() releases an
acquired well-known name. It takes a bus connection and a valid
bus name as parameters.
On success, these calls return 0 or a positive integer. On failure, these calls return a negative errno-style error code.
SD_BUS_NAME_QUEUE is specified,
sd_bus_request_name() will return 0 when the
name is already taken by another peer and the client has been
added to the queue for the name. In that case, the caller can
subscribe to "
NameOwnerChanged" signals to be
notified when the name is successfully acquired.
sd_bus_request_name() returns > 0 when the
name has immediately been acquired successfully.
Returned errors may indicate the following problems:
The caller already is the owner of the specified name.
The name has already been acquired by a different peer, and SD_BUS_NAME_REPLACE_EXISTING was not specified or the other peer did not specify SD_BUS_NAME_ALLOW_REPLACEMENT while acquiring the name.
It was attempted to release a name that is currently not registered on the bus.
It was attempted to release a name that is owned by a different peer on the bus.
A specified parameter is invalid. This is also generated when the requested name is a special service name reserved by the D-Bus specification, or when the operation is requested on a connection that does not refer to a bus.
The bus connection has been disconnected.
The bus connection has been created in a different process than the current one.
sd_bus_release_name() interfaces are
available as a shared library, which can be compiled and linked to