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   sd_bus_get_n_queued_write    ( 3 )

получить количество ожидающих сообщений шины в очередях чтения и записи объекта подключения к шине (Get the number of pending bus messages in the read and write queues of a bus connection object)

Имя (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

Синопсис (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);


Описание (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 64bit 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.


Возвращаемое значение (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.


Смотри также (See also)

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