NAME

       sd_bus_request_name, sd_bus_release_name - Request or release a well-known service name on
       a bus

SYNOPSIS

       #include <systemd/sd-bus.h>

       int sd_bus_request_name(sd_bus *bus, const char *name, uint64_t flags);

       int sd_bus_release_name(sd_bus *bus, const char *name);

DESCRIPTION

       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:

       SD_BUS_NAME_ALLOW_REPLACEMENT
           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.

       SD_BUS_NAME_REPLACE_EXISTING
           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.

       SD_BUS_NAME_QUEUE
           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.

RETURN VALUE

       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.

ERRORS

       Returned errors may indicate the following problems:

       -EALREADY
           The caller already is the owner of the specified name.

       -EEXIST
           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.

       -ESRCH
           It was attempted to release a name that is currently not registered on the bus.

       -EADDRINUSE
           It was attempted to release a name that is owned by a different peer on the bus.

       -EINVAL
           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.

       -ENOTCONN
           The bus connection has been disconnected.

       -ECHILD
           The bus connection has been created in a different process than the current one.

NOTES

       The sd_bus_acquire_name() and sd_bus_release_name() interfaces are available as a shared
       library, which can be compiled and linked to with the libsystemd pkg-config(1) file.

SEE ALSO

       systemd(1), sd-bus(3), sd_bus_new(3)