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sd_bus_enqueue_for_read(3) — Linux manual page

SD_BUS_E..._FOR_READ(3)  sd_bus_enqueue_for_readSD_BUS_E..._FOR_READ(3)

NAME        top

       sd_bus_enqueue_for_read - Re-enqueue a bus message on a bus       connection, for reading

SYNOPSIS        top

#include <systemd/sd-bus.h>int sd_bus_enqueue_for_read(sd_bus *bus, sd_bus_message *message);

DESCRIPTION        top

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        top

       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        top

       Functions described here are available as a shared library, which       can be compiled against and linked to with thelibsystemd pkg-config(1) file.       The code described here usesgetenv(3), which is declared to be       not multi-thread-safe. This means that the code calling the       functions described here must not callsetenv(3) from a parallel       thread. It is recommended to only do calls tosetenv()from an       early phase of the program when no other threads have been       started.

HISTORY        top

sd_bus_enqueue_for_read()was added in version 245.

SEE ALSO        top

systemd(1),sd-bus(3),sd_bus_send(3)

COLOPHON        top

       This page is part of thesystemd (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 2025-08-11.  (At that       time, the date of the most recent commit that was found in the       repository was 2025-08-11.)  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 isnot part of the original manual page), send a mail to       man-pages@man7.orgsystemd 258~rc2SD_BUS_E..._FOR_READ(3)

Pages that refer to this page:sd-bus(3), systemd.directives(7), systemd.index(7)

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