CS 6. 0 Computer Networks. Lecture 3 and 4. Socket Programming. Multi-Client Server Chat Application Using. The code of this program: Client.c . Multi-Client Server Chat Application Using Socket Programming – TCP.How do we build Internet applications? In this lecture, we will discuss the socket API and support for. TCP and UDP communications between end hosts. Socket programing is the key API for programming. Internet. A program is read into. The exec() has six variants, but. Sometimes, task is used instead of process. UNIX guarantees that every process has a unique identifier called the process ID. Whenever it opens an existing file or creates a new file, the. As we will see in this course, sockets. From a server’s perspective, at any. Client. need to know of the existence of and the address of the server, but the server does not need. Client and servers communicate by means of multiple layers of network protocols. In this course we will. TCP/IP protocol suite. The largest WAN is the Internet, but companies may have their own WANs. The application writes a message to a UDP socket, which is. UDP datagram, which is further encapsulated in an IP datagram, which is sent to. The length of a datagram is passed to the receiving. When a TCP client send data to the server, it requires an acknowledgement in. If an acknowledgement is not received, TCP automatically retransmit the data and waits for a. TCP is instead a byte- stream. But any. socket function that takes one of these pointers as an argument must deal with socket address structures. With ANSI C, the solution is to use.
But the socket functions predate the definition of ANSI C and the. We call them collectively host byte order. For example, an Intel processor stores. IBM Power. PC processors would store the integer in the byte order. The Internet protocols use. The latter return the. This call typically blocks until. With the Internet protocols, the address is the. IPv. 4 or IPv. 6 address (3. TCP port. number. For example for and IPv. For a TCP server, this restricts the socket to. IP address. The kernel chooses the source IP socket. If a TCP server does not bind an IP address to. IP address of the incoming packets as the server’s source. A Chat Client/Server Program for C#. Here's some code for a chat server, and an accompanying client program. The client: using System.IO; using System.Net. How do I create a TCP client server program in C. How do I write a server program using both TCP and. I wrote this socket program (client and server) using TCP. Code a simple socket client class. A TCP/IP Server written in C#. Server: A program waits for some one for communications. It is defined as. The backlog argument provides an hint to the system of the number of. Once the queue is full, the. The backlog value must be chosen based on the. It is defined as. The. cliaddr and addrlen arguments are used to return the protocol address of the client. The new socket. descriptor has the same socket type and address family of the original socket. The original socket passed to. The kernel creates one connected socket for each client connection that is. However, if we want to specify options we need another set of. The additional argument flags is. We will not consider the possible options in this. We will assume it equal to 0. We will not consider the possible options in this course. We will assume it equal to. It returns 0 if it. It is defined as follows. UDP Socket APIThere are some fundamental differences between TCP and UDP sockets. UDP is a connection- less. TCP is instead connection- oriented, reliable and stream based). There are. some instances when it makes to use UDP instead of TCP. Some popular applications built. UDP are DNS, NFS, SNMP and for example, some Skype services and streaming. First of all, the client does. Instead, the client just sends a datagram to the. Instead, the server just calls the. The. recvfrom() function is defined as follows. In our examples we will set all the values of the flags argument to 0. The recvfrom. function fills in the socket address structure pointed to by from with the protocol address of who sent the. The number of bytes stored in the socket address structure is returned in the integer pointed by. The to argument is a socket address. IP address and port number) of where the data is sent. An iterative server iterates through each. 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. An alternative technique is to use threads instead (i. We do not consider. It is defined as follows. It returns once in the calling process (called. ID of the newly created process (its child). It also returns in the child, with. The return value tells whether the current process is the parent or the. The parent process waits for another. The parent closes the connected socket since the. The interactions among client and server are presented in Figure. We present an iterative and a concurrent implementation of the.
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