TCP Callback Client program: main function

Create sockets, reload the internetwork socket address structure

Create a TCP socket, filling an internetwork socket address structure with the server's IP address and port number

We can get the IP address of the server from the command line parameter

Get the server's well-known port number (Serv_port) from the Unp.h file

Connect to Server

Connect to establish a connection to the server

The STR_CLI function completes the remainder of the client processing work

#include "unp.h" intmain (int argc, char **argv) {intsockfd;struct sockaddr_inservaddr;if (argc! = 2) err_quit ("Usage: TCPCLI <IPaddress> "); sockfd = Socket (af_inet, sock_stream, 0); Bzero (&servaddr, sizeof (SERVADDR)); servaddr.sin_family = Af_inet;servaddr.sin_port = Htons (Serv_port); Inet_pton (Af_inet, argv[1], &servaddr.sin_ addr); Connect (SOCKFD, (SA *) &servaddr, sizeof (SERVADDR)), Str_cli (stdin, SOCKFD);/* Do it All */exit (0);}

　　

TCP Callback Client program: main function