x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
SD_BUS_GET_N_QUEUED_READ(3) sd_bus_get_fd SD_BUS_GET_N_QUEUED_READ(3)
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.
SEE ALSO
systemd(1), sd-bus(3), sd_bus_process(3), sd_bus_send(3),
sd_bus_flush(3)
systemd 254 SD_BUS_GET_N_QUEUED_READ(3)
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