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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | HISTORY | SEE ALSO | COLOPHON |
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SD_BUS_E..._FOR_READ(3) sd_bus_enqueue_for_read SD_BUS_E..._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, 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.
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.
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.
sd_bus_enqueue_for_read() was added in version 245.
systemd(1), sd-bus(3), sd_bus_send(3)
This page is part of the systemd (systemd system and service
manager) project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have
a bug report for this manual page, see
⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
This page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2024-06-14. (At that
time, the date of the most recent commit that was found in the
repository was 2024-06-13.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
[email protected]
systemd 257~devel SD_BUS_E..._FOR_READ(3)
Pages that refer to this page: systemd.directives(7), systemd.index(7)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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