x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
SD_BUS_MESSAGE_SET_DESTIsd_bus_message_set_deSD_BUS_MESSAGE_SET_DESTINATION(3)
NAME
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
SYNOPSIS
#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() and
sd_bus_message_set_sender(), the message is already sealed.
-EEXIST
The message already has a destination or sender field set.
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_new(3), sd_bus_set_sender(3)
systemd 254 SD_BUS_MESSAGE_SET_DESTINATION(3)
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