sd_bus_message_set_destination(3) — Linux manual page


SD_BUS_...INATION(3) sd_bus_message_set_destination SD_BUS_...INATION(3)

NAME         top

       sd_bus_message_set_destination, sd_bus_message_get_destination,
       sd_bus_message_get_path, sd_bus_message_get_interface,
       sd_bus_message_get_member, sd_bus_message_set_sender,
       sd_bus_message_get_sender - Set and query bus message addressing

SYNOPSIS         top

       #include <systemd/sd-bus.h>

       int sd_bus_message_set_destination(sd_bus_message *message,
                                          const char *destination);

       const char*
                                                  sd_bus_message_get_destination(sd_bus_message *message);

       const char* sd_bus_message_get_path(sd_bus_message *message);

       const char*
                                                sd_bus_message_get_interface(sd_bus_message *message);

       const char* sd_bus_message_get_member(sd_bus_message *message);

       int sd_bus_message_set_sender(sd_bus_message *message,
                                     const char *sender);

       const char* sd_bus_message_get_sender(sd_bus_message *message);

DESCRIPTION         top

       sd_bus_message_set_destination() sets the destination service
       name for the specified bus message object. The specified name
       must be a valid unique or well-known service name.

       sd_bus_message_get_destination(), sd_bus_message_get_path(),
       sd_bus_message_get_interface(), and sd_bus_message_get_member()
       return the destination, path, interface, and member fields from
       message header. The return value will be NULL is message is NULL
       or the message is of a type that doesn't use those fields or the
       message doesn't have them set. See
       sd_bus_message_new_method_call(3) and
       sd_bus_message_set_destination(3) for more discussion of those

       sd_bus_message_set_sender() sets the sender service name for the
       specified bus message object. The specified name must be a valid
       unique or well-known service name. This function is useful only
       for messages to send on direct connections as for connections to
       bus brokers the broker will fill in the destination field anyway,
       and the sender field set by original sender is ignored.

       sd_bus_message_get_sender() returns the sender field from

       When a string is returned, it is a pointer to internal storage,
       and may not be modified or freed. It is only valid as long as the
       message remains referenced and this field hasn't been changed by
       a different call.

RETURN VALUE         top

       On success, these calls return 0 or a positive integer. On
       failure, these calls return a negative errno-style error code.

       Returned errors may indicate the following problems:

           The message parameter or the output parameter are NULL.

           For sd_bus_message_set_destination() and
           sd_bus_message_set_sender(), the message is already sealed.

           The message already has a destination or sender field set.

NOTES         top

       Functions described here are available as a shared library, which
       can be compiled against and linked to with the
       libsystemd pkg-config(1) file.

       The code described here uses getenv(3), which is declared to be
       not multi-thread-safe. This means that the code calling the
       functions described here must not call setenv(3) from a parallel
       thread. It is recommended to only do calls to setenv() from an
       early phase of the program when no other threads have been

HISTORY         top

       sd_bus_message_set_destination() and sd_bus_message_set_sender()
       were added in version 237.

       sd_bus_message_get_destination(), sd_bus_message_get_path(),
       sd_bus_message_get_interface(), sd_bus_message_get_member(), and
       sd_bus_message_get_sender() were added in version 240.

SEE ALSO         top

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

COLOPHON         top

       This page is part of the systemd (systemd system and service
       manager) project.  Information about the project can be found at
       ⟨⟩.  If you have
       a bug report for this manual page, see
       This page was obtained from the project's upstream Git repository
       ⟨⟩ on 2023-12-22.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2023-12-22.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to

systemd 255                                         SD_BUS_...INATION(3)

Pages that refer to this page: sd-bus(3)sd_bus_message_get_type(3)sd_bus_message_new_signal(3)sd_bus_message_set_destination(3)sd_bus_send(3)sd_bus_set_sender(3)systemd.directives(7)systemd.index(7)