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 with the
SD_BUS_NAME_REPLACE_EXISTING flag set. If
SD_BUS_NAME_ALLOW_REPLACEMENT is 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 setting
SD_BUS_NAME_ALLOW_REPLACEMENT while acquiring it.
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.
If 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
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.
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systemd 233 SD_BUS_REQUEST_NAME(3)