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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | HISTORY | SEE ALSO | COLOPHON |
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SD_BUS_GET_N_QUEUED_READ(3) sd_bus_get_fd SD_BUS_GET_N_QUEUED_READ(3)
sd_bus_get_n_queued_read, sd_bus_get_n_queued_write - Get the
number of pending bus messages in the read and write queues of a
bus connection object
#include <systemd/sd-bus.h>
int sd_bus_get_n_queued_read(sd_bus *bus, uint64_t *ret);
int sd_bus_get_n_queued_write(sd_bus *bus, uint64_t *ret);
sd_bus_get_n_queued_read() may be used to query the number of bus
messages in the read queue of a bus connection object. The read
queue contains all messages read from the transport medium (e.g.
network socket) but not yet processed locally. The function
expects two arguments: the bus object to query, and a pointer to a
64-bit counter variable to write the current queue size to. Use
sd_bus_process() in order to process queued messages, i.e. to
reduce the size of the read queue (as well as, in fact, the write
queue, see below).
Similarly, sd_bus_get_n_queued_write() may be used to query the
number of currently pending bus messages in the write queue of a
bus connection object. The write queue contains all messages
enqueued into the connection with a call such as sd_bus_send() but
not yet written to the transport medium. The expected arguments
are similar to sd_bus_get_n_queued_read(). Here too, use
sd_bus_process() to reduce the size of the write queue.
Alternatively, use sd_bus_flush() to synchronously write out any
pending bus messages until the write queue is empty.
On success, these functions return 0 or a positive integer. On
failure, they return a negative errno-style error code.
Errors
Returned errors may indicate the following problems:
-ECHILD
The bus connection was created in a different process, library
or module instance.
sd_bus_get_n_queued_read() and sd_bus_get_n_queued_write() were
added in version 238.
systemd(1), sd-bus(3), sd_bus_process(3), sd_bus_send(3),
sd_bus_flush(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 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 is not part of the original manual page), send a mail to
[email protected]
systemd 258~rc2 SD_BUS_GET_N_QUEUED_READ(3)
Pages that refer to this page: sd-bus(3), systemd.directives(7), systemd.index(7)
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HTML rendering created 2025-09-06 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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