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

       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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systemd 245                                  SD_BUS_MESSAGE_GET_SIGNATURE(3)

Pages that refer to this page: sd-bus(3)30-systemd-environment-d-generator(7)systemd.directives(7)systemd.index(7)