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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON |
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SD_BUS_MESSAGE_GET_SIGNATURE(3)ssage_get_signatureSSAGE_GET_SIGNATURE(3)
sd_bus_message_get_signature, sd_bus_message_is_empty,
sd_bus_message_has_signature - Query bus message signature
#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);
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().
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.
These APIs are implemented as a shared library, which can be
compiled and linked to with the libsystemd pkg-config(1) file.
systemd(1), sd-bus(3), sd_bus_message_new(3)
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 2022-12-17. (At that
time, the date of the most recent commit that was found in the
repository was 2022-12-16.) 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 252 SD_BUS_MESSAGE_GET_SIGNATURE(3)
Pages that refer to this page: sd-bus(3), systemd.directives(7), systemd.index(7)
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