Trait gio::prelude::DatagramBasedExt
source · pub trait DatagramBasedExt: IsA<DatagramBased> + Sealed + 'static {
// Provided method
fn condition_check(&self, condition: IOCondition) -> IOCondition { ... }
}Expand description
Provided Methods§
sourcefn condition_check(&self, condition: IOCondition) -> IOCondition
fn condition_check(&self, condition: IOCondition) -> IOCondition
Checks on the readiness of @self to perform operations. The operations specified in @condition are checked for and masked against the currently-satisfied conditions on @self. The result is returned.
glib::IOCondition::IN will be set in the return value if data is available to read with
g_datagram_based_receive_messages(), or if the connection is closed remotely
(EOS); and if the datagram_based has not been closed locally using some
implementation-specific method (such as g_socket_close() or
g_socket_shutdown() with @shutdown_read set, if it’s a #GSocket).
If the connection is shut down or closed (by calling g_socket_close() or
g_socket_shutdown() with @shutdown_read set, if it’s a #GSocket, for
example), all calls to this function will return IOErrorEnum::Closed.
glib::IOCondition::OUT will be set if it is expected that at least one byte can be sent
using g_datagram_based_send_messages() without blocking. It will not be set
if the datagram_based has been closed locally.
glib::IOCondition::HUP will be set if the connection has been closed locally.
glib::IOCondition::ERR will be set if there was an asynchronous error in transmitting data
previously enqueued using g_datagram_based_send_messages().
Note that on Windows, it is possible for an operation to return
IOErrorEnum::WouldBlock even immediately after
g_datagram_based_condition_check() has claimed that the #GDatagramBased is
ready for writing. Rather than calling g_datagram_based_condition_check() and
then writing to the #GDatagramBased if it succeeds, it is generally better to
simply try writing right away, and try again later if the initial attempt
returns IOErrorEnum::WouldBlock.
It is meaningless to specify glib::IOCondition::ERR or glib::IOCondition::HUP in @condition; these
conditions will always be set in the output if they are true. Apart from
these flags, the output is guaranteed to be masked by @condition.
This call never blocks.
§condition
a #GIOCondition mask to check
§Returns
the #GIOCondition mask of the current state