NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | NOTES | SEE ALSO | COLOPHON

SD_BUS_REQUEST_NAME(3)       sd_bus_request_name      SD_BUS_REQUEST_NAME(3)

NAME         top

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

SYNOPSIS         top

       #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         top

       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         top

       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         top

       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         top

       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         top

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

COLOPHON         top

       This page is part of the systemd (systemd system and service manager)
       project.  Information about the project can be found at 
       ⟨http://www.freedesktop.org/wiki/Software/systemd⟩.  If you have a bug
       report for this manual page, see 
       ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.  This
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       COLOPHON (which is not part of the original manual page), send a mail
       to man-pages@man7.org

systemd 233                                           SD_BUS_REQUEST_NAME(3)