SD_BUS_MESSAGE_GET_SIGNATsd_bus_message_get_sigSD_BUS_MESSAGE_GET_SIGNATURE(3)

NAME
       sd_bus_message_get_signature, sd_bus_message_is_empty,
       sd_bus_message_has_signature - Query bus message signature

SYNOPSIS
       #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
       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
       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.

   Errors
       Returned errors may indicate the following problems:

       -EINVAL
           The message parameter is NULL.

       NULL
           The message parameter is NULL.

NOTES
       These APIs are implemented as a shared library, which can be compiled
       and linked to with the libsystemd pkg-config(1) file.

SEE ALSO
       systemd(1), sd-bus(3), sd_bus_message_new(3)

systemd 252                                    SD_BUS_MESSAGE_GET_SIGNATURE(3)

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