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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON |
SD_BUS_ENQUEUE_FOR_READ(3) sd_bus_enqueue_for_readSD_BUS_ENQUEUE_FOR_READ(3)
sd_bus_enqueue_for_read - Re-enqueue a bus message on a bus
connection, for reading
#include <systemd/sd-bus.h>
int sd_bus_enqueue_for_read(sd_bus *bus, sd_bus_message *message);
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, similar 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.
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.
These APIs are implemented as a shared library, which can be compiled
and linked to with the libsystemd pkg-config(1) file.
systemd(1), sd-bus(3), sd_bus_send(3),
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systemd 246 SD_BUS_ENQUEUE_FOR_READ(3)
Pages that refer to this page: 30-systemd-environment-d-generator(7) , systemd.directives(7) , systemd.index(7)