What happens when a socket is closed?
What happens when a socket is closed?
close() call shuts down the socket associated with the socket descriptor socket, and frees resources allocated to the socket. If socket refers to an open TCP connection, the connection is closed. If a stream socket is closed when there is input data queued, the TCP connection is reset rather than being cleanly closed.
Do you need to close server socket?
Yes. While destroying references to the socket may cause the garbage collector to finalize it, that does not specify that it will be closed. This is implementation-specific in many cases, and can sometimes derail relative to design due to performance or even minute bugs that are hard to track.
What happens if server socket is not able to listen?
4. What happens if ServerSocket is not able to listen on the specified port? Explanation: public ServerSocket() creates an unbound server socket. It throws IOException if specified port is busy when opening the socket.
How do I know if my client socket is closed?
isConnected() tells you whether you have connected this socket. You have, so it returns true. isClosed() tells you whether you have closed this socket.
What happens if TCP connection is not closed?
If the connection is not closed by design, it will likely be closed by a time-out as part of connection management. Time-outs were created to handle error control in TCP. Servers usually have some time restriction that is activated when the connection has been idle for a given period.
Why we need to close socket?
When you have finished using a socket, you can simply close its file descriptor with close ; see Opening and Closing Files. If there is still data waiting to be transmitted over the connection, normally close tries to complete this transmission. The shutdown function shuts down the connection of socket socket .
When would you use close vs shutdown on sockets?
Ideal implementations for SHUT_RD and SHUT_WR Any pending and subsequent read requests (regardless whichever thread they are in) will then returned with zero sized result. However, the connection is still active and usable — you can still receive OOB data, for example.
What will happen if two thread of the same priority are called to be processed simultaneously?
Thread priority is integers that specify relative priority of one thread to another. 4. What will happen if two thread of the same priority are called to be processed simultaneously? Some execute them in time sliced manner some depending on the thread they call.
How do you check if the socket is connected in Java?
2 Answers
- socket. isConnected() returns always true once the client connects (and even after the disconnect) weird !!
- socket.getInputStream().read()
- socket.getInetAddress().isReachable(int timeout) : From isReachable(int timeout)