title: Client Server multiple connections in C
body: <p>I am trying to reason about how a simple server implemented in C with sockets can handle concurrent clients. Let's say a simple server waits for a client to connect and then read a message sent from the client. read() is a blocking function so the server will block until a client writes to it. If we assume two clients are concurrently writing to the server. The server will wake up to one of them but what will happen to the other one? is the server still "listening" while handling the request from the first client? I know that the bind function takes an int as the second argument that specifies the backlog (5 by default). does that mean that only 5 clients can connect concurrently to a server? If thats true, how are servers that handle multiple concurrent connections are implemented?</p>