Socket.select

Wait for a socket to change status. A wait timeout of core.time.Duration or TimeVal, may be specified; if a timeout is not specified or the TimeVal is null, the maximum timeout is used. The TimeVal timeout has an unspecified value when select returns.

int select(SocketSet checkRead, SocketSet checkWrite, SocketSet checkError, Duration timeout)
int select(SocketSet checkRead, SocketSet checkWrite, SocketSet checkError)
int select(SocketSet checkRead, SocketSet checkWrite, SocketSet checkError, TimeVal* timeout)
class Socket
static
@trusted in
int
select
(
SocketSet checkRead
,
SocketSet checkWrite
,
SocketSet checkError
,
TimeVal* timeout
)

Return Value

Type: int

The number of sockets with status changes, 0 on timeout, or -1 on interruption. If the return value is greater than 0, the SocketSets are updated to only contain the sockets having status changes. For a connecting socket, a write status change means the connection is established and it's able to send. For a listening socket, a read status change means there is an incoming connection request and it's able to accept.

SocketSet's updated to include only those sockets which an event occured. For a connect()ing socket, writeability means connected. For a listen()ing socket, readability means listening Winsock; possibly internally limited to 64 sockets per set.

the number of events, 0 on timeout, or -1 on interruption

Socket.select

Return Value

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