x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
SD_BUS_ENQUEUE_FOR_READ(3) sd_bus_enqueue_for_read SD_BUS_ENQUEUE_FOR_READ(3)
NAME
sd_bus_enqueue_for_read - Re-enqueue a bus message on a bus connection,
for reading
SYNOPSIS
#include <systemd/sd-bus.h>
int sd_bus_enqueue_for_read(sd_bus *bus, sd_bus_message *message);
DESCRIPTION
sd_bus_enqueue_for_read() may be used to re-enqueue an incoming bus
message on the local read queue, so that it is processed and dispatched
locally again, similarly to how an incoming message from the peer is
processed. Takes a bus connection object and the message to enqueue. A
reference is taken of the message and the caller's reference thus
remains in possession of the caller. The message is enqueued at the end
of the queue, thus will be dispatched after all other already queued
messages are dispatched.
This call is primarily useful for dealing with incoming method calls
that may be processed only after an additional asynchronous operation
completes. One example are PolicyKit authorization requests that are
determined to be necessary to authorize a newly incoming method call:
when the PolicyKit response is received the original method call may be
re-enqueued to process it again, this time with the authorization
result known.
RETURN VALUE
On success, this function return 0 or a positive integer. On failure,
it returns a negative errno-style error code.
Errors
Returned errors may indicate the following problems:
-ECHILD
The bus connection has been created in a different process, library
or module instance.
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_send(3),
systemd 254 SD_BUS_ENQUEUE_FOR_READ(3)
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