sd_bus_message_get_signature(3) — Linux manual page



NAME         top

       sd_bus_message_get_signature, sd_bus_message_is_empty,
       sd_bus_message_has_signature - Query bus message signature

SYNOPSIS         top

       #include <systemd/sd-bus.h>

       const char* sd_bus_message_get_signature(sd_bus_message *message,
                                                int complete);

       int sd_bus_message_is_empty(sd_bus_message *message);

       int sd_bus_message_has_signature(sd_bus_message *message,
                                        const char *signature);

DESCRIPTION         top

       sd_bus_message_get_signature() returns the signature of message
       message. If complete is true, the signature of the whole message
       is returned, and just the signature of the currently open
       container otherwise.

       sd_bus_message_is_empty() returns true if the message is empty,
       i.e. when its signature is empty.

       sd_bus_message_has_signature() returns true if the signature of
       the message message matches given signature. Parameter signature
       may be NULL, this is treated the same as an empty string, which
       is equivalent to calling sd_bus_message_is_empty().

RETURN VALUE         top

       On success, sd_bus_message_get_signature() returns the signature,
       and NULL on error.

       The other functions return 0 or a positive integer on success. On
       failure, they return a negative errno-style error code.

       Returned errors may indicate the following problems:

           The message parameter is NULL.

           The message parameter is NULL.

NOTES         top

       These APIs are implemented 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_message_new(3)

COLOPHON         top

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       This page was obtained from the project's upstream Git repository
       ⟨⟩ on 2022-12-17.  (At that
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systemd 252                              SD_BUS_MESSAGE_GET_SIGNATURE(3)

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