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
       These APIs are implemented as a shared library, which can be compiled
       and linked to with the libsystemd pkg-config(1) file.

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 252                                         SD_BUS_MESSAGE_GET_TYPE(3)

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