sd_bus_message_set_destination

systemd
sd_bus_message_set_destination 3
sd_bus_message_set_destination 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` is message is `NULL` or the message is of a type that doesn't use those fields or the message doesn't 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 hasn't 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` or `sd_bus_message_set_sender`, the message is already sealed.

`-EEXIST`

  The message already has a destination or sender field set.

## See Also

systemd 1, sd-bus 3, sd_bus_new 3, sd_bus_set_sender 3