x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
SD_BUS_MESSAGE_GET_TYPE(3) sd_bus_message_get_type SD_BUS_MESSAGE_GET_TYPE(3)
NAME
sd_bus_message_get_type, sd_bus_message_get_error,
sd_bus_message_get_errno, sd_bus_message_get_creds,
sd_bus_message_is_signal, sd_bus_message_is_method_call,
sd_bus_message_is_method_error - Query bus message
addressing/credentials metadata
SYNOPSIS
#include <systemd/sd-bus.h>
int sd_bus_message_get_type(sd_bus_message *m, uint8_t *type);
sd_bus_error* sd_bus_message_get_error(sd_bus_message *m);
int sd_bus_message_get_errno(sd_bus_message *m);
sd_bus_creds* sd_bus_message_get_creds(sd_bus_message *m);
int sd_bus_message_is_signal(sd_bus_message *m, const char *interface,
const char *member);
int sd_bus_message_is_method_call(sd_bus_message *m,
const char *interface,
const char *member);
int sd_bus_message_is_method_error(sd_bus_message *m,
const char *name);
DESCRIPTION
sd_bus_message_get_type() returns the type of a message in the output
parameter type, one of SD_BUS_MESSAGE_METHOD_CALL,
SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR,
SD_BUS_MESSAGE_SIGNAL. This type is either specified as a parameter
when the message is created using sd_bus_message_new(3), or is set
automatically when the message is created using
sd_bus_message_new_signal(3), sd_bus_message_new_method_call(3),
sd_bus_message_new_method_error(3) and similar functions.
sd_bus_message_get_error() returns the error stored in the message m,
if there is any. Otherwise, it returns NULL.
sd_bus_message_get_errno() returns the error stored in the message m as
a positive errno-style value, if there is any. Otherwise, it returns
zero. Errors are mapped to errno values according to the default and
any additional registered error mappings. See sd-bus-errors(3) and
sd_bus_error_add_map(3).
sd_bus_message_get_creds() returns the message credentials attached to
the message m. If no credentials are attached to the message, it
returns NULL. Ownership of the credentials instance is not transferred
to the caller and hence should not be freed.
sd_bus_message_is_signal() checks if message m is a signal message. If
interface is non-null, it also checks if the message has the same
interface set. If member is non-null, it also checks if the message has
the same member set. Also see sd_bus_message_new_signal(3). It returns
true when all checks pass.
sd_bus_message_is_method_call() checks if message m is a method call
message. If interface is non-null, it also checks if the message has
the same interface set. If member is non-null, it also checks if the
message has the same member set. Also see
sd_bus_message_new_method_call(3). It returns true when all checks
pass.
sd_bus_message_is_method_error() checks if message m is an error reply
message. If name is non-null, it also checks if the message has the
same error identifier set. Also see sd_bus_message_new_method_error(3).
It returns true when all checks pass.
RETURN VALUE
On success, these functions (except sd_bus_message_get_error() and
sd_bus_message_get_creds()) return a non-negative integer. On failure,
they return a negative errno-style error code.
sd_bus_message_get_errno() always returns a non-negative integer, even
on failure.
Errors
Returned errors may indicate the following problems:
-EINVAL
The message parameter m or an output 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),
sd_bus_message_set_destination(3), sd-bus-errors(3),
sd_bus_error_add_map(3)
systemd 254 SD_BUS_MESSAGE_GET_TYPE(3)
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