linux socket programming by example pdf

read, write, and exception handling that are monitored by select (). If you want to determine whether you can read data from a standard input and a socket descriptor, you only need to add the standard input file descriptor 0 and the corresponding SOCKDTFD to the Readfds collection; The Numfds value is the highest number of file descriptions multibyte 1 that need to be checked, In this example, the value of

truncation is attached:int main () {int SOCKFD = socket (af_inet, SOCK_DGRAM, 0); if (SOCKFD = =-1) err_exit ("Socket error"); struct sockaddr_in servaddr; servaddr.sin_family = af_inet; SERVADDR.SIN_ADDR.S_ADDR = htonl (Inaddr_any); Servaddr.sin_port = htons (8001); if (Bind (SOCKFD, (const struct sockaddr *) servaddr, sizeof (servaddr)) = =-1) err_exit ("Bind error"); Sen

Socket programming practices in Linux (10) Basic UDP programming detailsIn my two blogs, I briefly introduced and implemented the server and client programs under UDP (TCP)-based windows (basically consistent procedures in UNIX, this article continues to explore some details about UDP programming.Is a simple UDP client

parallelwhile (true){String Str=in.readline ();System.out.println (str);OUT.PRINTLN ("has receive.");Out.flush ();if (Str.equals ("End"))Break}Client.close ();}catch (IOException ex){}finally{}}public static void Main (string[] args) throws IOException{ServerSocket server=new ServerSocket (5678);while (true){Transfer location Change single user or Multi userMultiuser mu=new multiuser (server.accept ());Mu.start ();}}}My class inherits directly from the thread class. And the constructor passes t

server side and the client can implement the data transmission through the repeated calls of read and write according to the protocol.Three, close the connection:When the data transfer is complete, the server and client can call close to close the connection, one end of the connection is closed, the other end of the Read function will return 0, can be based on this feature to sense the other end of the exit.Here's a simple echoserver to show you how to create server-side and client code, where

With the development and popularization of Intenet, networks are widely used in embedded systems. more and more embedded devices use Linux operating systems. Linux is a free operating system with open source code and is highly portable. Therefore, it is increasingly important to study Socket network programming based o

destination address in the parameters.Here are some routines.TCPclient:/* Socket programming client code based on TCP protocol */#include TCP Service side:/* Socket Programming server-side code based on TCP protocol */#include Note that the SOCK_STREAM socket is assumed to

time, instead of locating a specific client socket, but waiting for a connection.A client request is a connection request initiated by a client socket. The target is a server socket. Therefore, the client socket must first describe the socket of the server to be connected,

Sockets are abstractions of communication endpoints. The file descriptor is created with the open function, and the socket descriptor is created with the socket function. The socket function prototype is as follows:int socket (int domain, int type, int protocol);//return value: Successfully returned

What is socket 　　A socket interface is an API of a TCP/IP network. A socket interface defines many functions or routines. programmers can use it to develop applications on a TCP/IP network. To learn TCP/IP network programming on the internet, you must understand the socket i

In networking, BSD socket programming is the most basic. But when perl is getting started, the biggest headache is how to start and how to Step by step. The best prescription is Example. A complete piece of code that can run (working) is far more profound than the boring manual. The following sections describe Socket a

this descriptor. Return On Error-1Parameter socket: set interface file descriptor. A pointer to the address struct:sockaddr_in parameter. Parameter addrlen: length, often sizeof (struct sockaddr_in)int connect (int socket, struct sockaddr *serv_addr, int addrlen) function: The client is used to connect to the server. return value: The 1 parameter socket

by using ternary group (IP address, Protocol, port), and the process communication in the network can use this flag to interact with other processes. Applications using the TCP/IP protocol typically use the application programming Interface: UNIX-BSD sockets and Unix System v Tli (have been eliminated) to enable communication between network processes. For now, almost all applications are socket, and now i

(Socket).Loop (Socket),Receive{udp,socket,host,port,bin}->Binreply= ...,Gen_udp:send (socket,host,port,binreply),Loop (Socket)End.UDP Client Example:Udp_demo_client (Request){ok,socket}= Gen_udp:open (0,[binary]),ok= gen_udp:send

With the development and popularization of Intenet, networks are widely used in embedded systems. More and more embedded devices use Linux operating systems. Linux is a free operating system with open source code and is highly portable. Therefore, it is increasingly important to study Socket network programming based o

The example in this paper describes the C # socket network programming techniques. Share to everyone for your reference. The specific analysis is as follows:The client wants to connect to the server: first know the IP address of the server. And the server has a lot of applications, each of which corresponds to a port numberSo the client wants to communicate with

client connections ...");//When a user connection request is received, this method returns a socket so that the client communicates//The port number of this socket and the port number of the ServerSocket are different from the socket Sock=serversocket.accept ();//This method blocks until a connection request arrives at SYSTEM.OUT.PRINTLN ("Address of this

Linux socket programming One, socket programming specific function parsing reference URLHttp://www.cnblogs.com/skynet/archive/2010/12/12/1903949.html (This article reproduced in this website, reproduced please indicate the source link)II. Basics of

char type occupies 1 bytes and the int is 4 bytes, so the output is 5?The answer is in the negative. You can try it yourself and the output is 8.Why is that? This is because the compiler optimizes the storage of the structure in order to keep the program running faster, reducing the instruction cycle of CPU read data. In fact, the first Char member, although originally only 1 bytes, actually takes up 4 bytes, so that the address of the second int member can be divisible by 4. So the actual cons

)throwsException {Newblockingnioserver (). Service (); } Private classHandlerImplementsRunnable {PrivateSocketchannel Channel; PublicHandler (Socketchannel channel) {Super(); This. Channel =Channel; } @Override Public voidRun () {handler (channel); } Public voidHandler (Socketchannel Channel) {Socket socket=NULL; Try{Socket=Channel.socket (); System.