x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
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
Functions described here are available as a shared library, which can
be compiled against and linked to with the libsystemd pkg-config(1)
file.
The code described here uses getenv(3), which is declared to be not
multi-thread-safe. This means that the code calling the functions
described here must not call setenv(3) from a parallel thread. It is
recommended to only do calls to setenv() from an early phase of the
program when no other threads have been started.
SEE ALSO
systemd(1), sd-bus(3), sd_bus_message_new(3)
systemd 254 SD_BUS_MESSAGE_GET_SIGNATURE(3)
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