Provided by: libsystemd-dev_257.4-1ubuntu3.1_amd64 bug

NAME
       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


SYNOPSIS
       #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);


DESCRIPTION
       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.


RETURN VALUE
       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.


HISTORY
       sd_bus_get_n_queued_read() and sd_bus_get_n_queued_write() were added in version 238.


SEE ALSO
       systemd(1), sd-bus(3), sd_bus_process(3), sd_bus_send(3), sd_bus_flush(3)

systemd 257.4                                                                        SD_BUS_GET_N_QUEUED_READ(3)