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)