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)
