|
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON |
SD_BUS_MESSAGE_GET_SIGNATURE(3)message_get_signatureMESSAGE_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
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systemd 246 SD_BUS_MESSAGE_GET_SIGNATURE(3)
Pages that refer to this page: 30-systemd-environment-d-generator(7) , systemd.index(7)