sd_bus_message_set_expect_reply(3) — Linux manual page


SD_BUS...T_REPLY(3)  sd_bus_message_set_expect_reply SD_BUS...T_REPLY(3)

NAME         top

       sd_bus_message_set_expect_reply, sd_bus_message_get_expect_reply,
       sd_bus_message_set_auto_start, sd_bus_message_get_auto_start,
       sd_bus_message_get_allow_interactive_authorization - Set and
       query bus message metadata

SYNOPSIS         top

       #include <systemd/sd-bus.h>

       int sd_bus_message_set_expect_reply(sd_bus_message *message,
                                           int b);

       int sd_bus_message_get_expect_reply(sd_bus_message *message);

       int sd_bus_message_set_auto_start(sd_bus_message *message,
                                         int b);

       int sd_bus_message_get_auto_start(sd_bus_message *message);

                                                              sd_bus_message_set_allow_interactive_authorization(sd_bus_message *message,
                                                              int b);

                                                              sd_bus_message_get_allow_interactive_authorization(sd_bus_message *message);

DESCRIPTION         top

       sd_bus_message_set_expect_reply() sets or clears the
       NO_REPLY_EXPECTED flag on the message m. This flag matters only
       for method call messages and is used to specify that no method
       return or error reply is expected. It is ignored for other types.
       Thus, for a method call message, calling

           sd_bus_message_set_expect_reply(..., 0)

       sets the flag and suppresses the reply.

       sd_bus_message_get_expect_reply() checks if the NO_REPLY_EXPECTED
       flag is set on the message m. It will return positive if it is
       not set, and zero if it is.

       sd_bus_message_set_auto_start() sets or clears the NO_AUTO_START
       flag on the message m. When the flag is set, the bus must not
       launch an owner for the destination name in response to this
       message. Calling

           sd_bus_message_set_auto_start(..., 0)

       sets the flag.

       sd_bus_message_get_auto_start() checks if the NO_AUTO_START flag
       is set on the message m. It will return positive if it is not
       set, and zero if it is.

       sd_bus_message_set_allow_interactive_authorization() sets or
       clears the ALLOW_INTERACTIVE_AUTHORIZATION flag on the message m.
       Setting this flag informs the receiver that the caller is
       prepared to wait for interactive authorization via polkit or a
       similar framework. Note that setting this flag does not guarantee
       that the receiver will actually perform interactive
       authorization. Also, make sure to set a suitable message timeout
       when using this flag since interactive authorization could
       potentially take a long time as it depends on user input. If b is
       non-zero, the flag is set.

       sd_bus_message_get_allow_interactive_authorization() checks if
       the ALLOW_INTERACTIVE_AUTHORIZATION flag is set on the message m.
       It will return a positive integer if the flag is set. Otherwise,
       it returns zero.

RETURN VALUE         top

       On success, these functions return a non-negative integer. On
       failure, they return a negative errno-style error code.

       Returned errors may indicate the following problems:

           The message parameter is NULL.

           The message message is sealed when trying to set a flag.

           The message message has wrong type.

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_auto_start(), and
       sd_bus_message_get_auto_start() were added in version 240.

       sd_bus_message_set_allow_interactive_authorization() and
       sd_bus_message_get_allow_interactive_authorization() were added
       in version 246.

SEE ALSO         top

       systemd(1), sd-bus(3), sd_bus_set_description(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...T_REPLY(3)

Pages that refer to this page: sd-bus(3)sd-bus-errors(3)sd_bus_message_new(3)systemd.directives(7)systemd.index(7)