sd_bus_message_set_destination

systemd

sd_bus_message_get_destination

sd_bus_message_get_path

sd_bus_message_get_interface

sd_bus_message_get_member

sd_bus_message_set_sender

sd_bus_message_get_sender

Set and query bus message addressing information

#include <systemd/sd-bus.h>

int

sd_bus_message_set_destination

sd_bus_message *

message

const char *

destination

const char*

sd_bus_message_get_destination

sd_bus_message *

message

const char*

sd_bus_message_get_path

sd_bus_message *

message

const char*

sd_bus_message_get_interface

sd_bus_message *

message

const char*

sd_bus_message_get_member

sd_bus_message *

message

int

sd_bus_message_set_sender

sd_bus_message *

message

const char *

sender

const char*

sd_bus_message_get_sender

sd_bus_message *

message

Description

sd_bus_message_set_destination() sets the destination service name for the specified bus message object. The specified name must be a valid unique or well-known service name.

sd_bus_message_get_destination(), sd_bus_message_get_path(), sd_bus_message_get_interface(), and sd_bus_message_get_member() return the destination, path, interface, and member fields from message header. The return value will be NULL if message is NULL or the message is of a type that does not use those fields or the message does not have them set. See sd_bus_message_new_method_call(3) and sd_bus_message_set_destination(3) for more discussion of those values.

sd_bus_message_set_sender() sets the sender service name for the specified bus message object. The specified name must be a valid unique or well-known service name. This function is useful only for messages to send on direct connections as for connections to bus brokers the broker will fill in the destination field anyway, and the sender field set by original sender is ignored.

sd_bus_message_get_sender() returns the sender field from message.

When a string is returned, it is a pointer to internal storage, and may not be modified or freed. It is only valid as long as the message remains referenced and this field has not been changed by a different call.

Return Value

On success, these calls return 0 or a positive integer. On failure, these calls return a negative errno-style error code.

Errors

Returned errors may indicate the following problems:

-EINVAL
The message parameter or the output parameter are NULL.

-EPERM
For sd_bus_message_set_destination() and sd_bus_message_set_sender(), the message is already sealed.

-EEXIST
The message already has a destination or sender field set.

History

sd_bus_message_set_destination() and sd_bus_message_set_sender() were added in version 237.

sd_bus_message_get_destination(), sd_bus_message_get_path(), sd_bus_message_get_interface(), sd_bus_message_get_member(), and sd_bus_message_get_sender() were added in version 240.