Linux Socket Learning

1 //server-side server.c2#include <stdio.h>3#include <stdlib.h>4#include <string.h>5#include <errno.h>6#include <sys/types.h>7#include <sys/socket.h>8#include <netinet/inch.h>9 #defineMAXLINE 4096Ten  One //socket (int domain, int type, int protocol) A //protocol Domain socket type Specify protocol - intMainintargcChar**argv) - { the     intN, LISTENFD, CONNFD; -     structsockaddr_in servaddr; -     CharBuff[maxline]; -     if(LISTENFD = socket (af_inet, Sock_stream,0)) == -1 ) +     { -printf"Create socket error:%s (error:%d) \ n", Strerror (errno), errno); +Exit0); A     } atmemset (&AMP;SERVADDR,0,sizeof(SERVADDR)); -servaddr.sin_family =af_inet; -SERVADDR.SIN_ADDR.S_ADDR = htonl (Inaddr_any);//the system binds the default network card as the IP address -Servaddr.sin_port = htons (6666);//listen to the port number No. 6666 on this machine. -  -     if(Bind (LISTENFD, (structsockaddr*) &servaddr,sizeof(SERVADDR)) == -1) in{//assign a specific address in the address family to the socket -printf"bind socket Error:%s (errno:%d) \ n", Strerror (errno), errno); toExit0); +     } -     if(Listen (LISTENFD,Ten) == -1) the{//Call Listen () to listen for sockets *printf"Listen socket Error:%s (errno:%d) \ n", Strerror (errno), errno); $Exit0);Panax Notoginseng     } -printf"waiting for client ' s request...\n"); the      while(1) +     { A         if(CONNFD = Accept (LISTENFD, (structsockaddr*) (null)) = =-1) the{//call the Accept () function to receive the request, the connection is established. +printf"Accept Socket Error:%s (errno:%d)", Strerror (errno), errno); -             Continue; $         } $n = recv (CONNFD, Buff, MAXLINE,0);//The recv function returns the number of bytes of its actual copy -Buff[n] =' /'; -printf"recv msg from client:%s\n", buff); the Close (CONNFD); -     }Wuyi Close (LISTENFD); the}

1 //Client client.c2#include <stdio.h>3#include <stdlib.h>4#include <string.h>5#include <errno.h>6#include <sys/types.h>7#include <sys/socket.h>8#include <netinet/inch.h>9 #defineMAXLINE 4096Ten  One intMainintargcChar**argv) A { -     intN, sockfd; -     CharRecvline[maxline], sendline[maxline]; the     structsockaddr_in servaddr; -     if(ARGC! =2) -     { -printf"usage:./client <ipaddress>\n"); +Exit0); -     } +     if(SOCKFD = socket (af_inet, Sock_stream,0)) <0) A     { atprintf"Create socket Error:%s (errno:%d) \ n", Strerror (errno), errno); -Exit0); -     } -memset (&AMP;SERVADDR,0,sizeof(SERVADDR)); -servaddr.sin_family =af_inet; -Servaddr.sin_port = htons (6666); in  -     if(Inet_pton (Af_inet, argv[1], &servaddr.sin_addr) <=0) to{//IP address translation function +printf"Inet_pton error for%s\n", argv[1]); -Exit0); the     } *     if(Connect (SOCKFD,structsockaddr*) &servaddr,sizeof(SERVADDR)) <0) ${//call Connect () to make a connection requestPanax Notoginsengprintf"Connect Error:%s (errno:%d) \ n", Strerror (errno), errno); -Exit0); the     } +printf"send msg to server: \ n"); AFgets (Sendline,4096, stdin); the     if(Send (SOCKFD, Sendline, strlen (Sendline),0) <0) +     { -printf"Send msg Error:%s (errno:%d) \ n", Strerror (errno), errno); $Exit0); $     } - Close (SOCKFD); -Exit0); the}

After compiling with GCC respectively, execute, open 2 terminals:

Linux Socket Learning