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Linux Socket Programming Pdf Download
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The steps to establish a socket on the server side are:Create a socket with the socket() system call.
The server process gives the socket a name. In linux file system, local sockets are given a filename, under /tmp or /usr/tmp directory. For network sockets, the filename will be a service identifier, port number, to which the clients can make connection. This identifier allows to route incoming connections (which has that the port number) to connect server process. A socket is named using bind() system call.
The server process then waits for a client to connect to the named socket, which is basically listening for connections with the listen() system call. If there are more than one client are trying to make connections, the listen() system call make a queue.The machine receiving the connection (the server) must bind its socket object to aknown port number. A port is a 16-bit number in the range 0-65535 that's managed bythe operating system and used by clients to uniquely identify servers. Ports 0-1023 arereserved by the system and used by common network protocols.
Accept a connection with the accept() system call. At accept(), a new socket is created that is distinct from the named socket. This new socket is used solely for communication with this particular client.For TCP servers, the socket object used to receive connections is not the same socketused to perform subsequent communication with the client. In particular, the accept()system call returns a new socket object that's actually used for the connection.This allows a server to manage connections from a large number of clients simultaneously.
Send and receive data.
The named socket remains for further connections from other clients. A typical web server can take advantage of multiple connections. In other words, it can serve pages to many clients at once. But for a simple server, further clients wait on the listen queue until the server is ready again.
The steps to establish a socket on the client side are:Create a socket with the socket() system call.
Connect the socket to the address of the server using the connect() system call.
Send and receive data. There are a number of ways to do this, but the simplest is to use the read() and write() system calls.
In our discussion of sockets, we covered an exampleof programming with connection-oriented sockets: sockets that use the TCP/IPprotocol. Here, we'll briefly look at an example using connectionless sockets over UDP/IP.
Welcome to Java Socket programming example. Every server is a program that runs on a specific system and listens on a specific port. Sockets are bound to the port numbers and when we run any server it just listens on the socket and waits for client requests. For example, tomcat server running on port 8080 waits for client requests and once it gets any client request, it responds to them.
A socket is one endpoint of a two-way communication link between two programs running on the network. The socket is bound to a port number so that the TCP layer can identify the application that data is destined to be sent. In java socket programming example tutorial, we will learn how to write java socket server and java socket client program. We will also learn how server client program read and write data on the socket. java.net.Socket and java.net.ServerSocket are the java classes that implements Socket and Socket server.
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