Can a socket send and receive at the same time?
Once connected, a TCP socket can only send and receive to/from the remote machine. This means that you’ll need one TCP socket for each client in your application. UDP is not connection-based, you can send and receive to/from anyone at any time with the same socket.
What is RECV sent?
The send() and recv() calls specify: The socket s on which to communicate. The address in storage of the buffer that contains, or will contain, the data (addr_of_data, addr_of_buffer) The size of this buffer (len_of_data, len_of_buffer)
Is Winsock send blocking?
send() blocks only if the socket is running in blocking mode and the socket’s outbound buffer fills up with queued data. If you are managing multiple sockets in the same thread, do not use blocking mode.
How a socket server can communicate with multiple clients concurrently?
Multiple clients can connect to the same port (say 80) on the server because on the server side, after creating a socket and binding (setting local IP and port) listen is called on the socket which tells the OS to accept incoming connections.
What is iterative and concurrent server?
An iterative server iterates through each client, handling it one at a time. A concurrent server handles multiple clients at the same time. The simplest technique for a concurrent server is to call the fork function, creating one child process for each client.
What does RECV function do?
The recv function is used to read incoming data on connection-oriented sockets, or connectionless sockets. When using a connection-oriented protocol, the sockets must be connected before calling recv. When using a connectionless protocol, the sockets must be bound before calling recv.
What does RECV return in C?
Returned value. If successful, recv() returns the length of the message or datagram in bytes. The value 0 indicates the connection is closed.
What is nonblocking mode?
If a CAsyncSocket object is in nonblocking mode (operating asynchronously), the call returns immediately and the current error code, retrievable with the GetLastError member function, is WSAEWOULDBLOCK, indicating that the call would have blocked had it not returned immediately because of the mode.
Can a server handle multiple processes concurrently?
The server can be iterative, i.e. it iterates through each client and serves one request at a time. Alternatively, a server can handle multiple clients at the same time in parallel, and this type of a server is called a concurrent server.
How does server handle multiple requests at the same time?
A web server can handle multiple requests by using a technique called multi-threading. This means that the server can create multiple threads, each of which can handle a request. A web server generally handles multiple requests by queueing them up and then servicing them one at a time.
What is RECV function in C?
The recv() function receives data on a socket with descriptor socket and stores it in a buffer. The recv() call applies only to connected sockets. Parameter Description socket. The socket descriptor. buf.
Does recv wait for data?
If no messages are available at the socket, the recv() call waits for a message to arrive unless the socket is nonblocking. If a socket is nonblocking, -1 is returned and the external variable errno is set to EWOULDBLOCK. select() can be used to wait for incoming messages.