sd_bus_message_has_signature(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON

SD_BUS_MESSAGE_GET_SIGNATURE(3)message_get_signatureMESSAGE_GET_SIGNATURE(3)

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.

   Errors
       Returned errors may indicate the following problems:

       -EINVAL
           The message parameter is NULL.

       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

       This page is part of the systemd (systemd system and service manager)
       project.  Information about the project can be found at 
       ⟨http://www.freedesktop.org/wiki/Software/systemd⟩.  If you have a bug
       report for this manual page, see
       ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.  This
       page was obtained from the project's upstream Git repository
       ⟨https://github.com/systemd/systemd.git⟩ on 2020-07-14.  (At that
       time, the date of the most recent commit that was found in the repos‐
       itory was 2020-07-14.)  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 man-pages@man7.org

systemd 246                                  SD_BUS_MESSAGE_GET_SIGNATURE(3)

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