Linux Network programming Echo server

Echo_server

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/socket.h>
#include <www.qixoo.qixoo.com/sys/types.h>
#include <signal.h>
#include <memory.h>
#include <errno.h>
#include <netinet/in.h>
#include <arpa/inet.h>



int sockfd;
void Sign_handler (int signo)
{
if (signo==sigint)
{
printf ("Server is Stop\n");
Close (SOCKFD);
}
if (SIGNO==SIGCHLD)
{
printf ("Server child is close\n");
Wait (0);
}
}

void Server_do (int fd)
{
Char Buffer[bufsiz];
ssize_t size;
while (1) {
printf ("Ready to read\n");
memset (buffer,0,sizeof (buffer));
if ((Size=read (fd,buffer,sizeof (buffer))) <0) {
Perror ("Protocal error\n");
Break
}else if (size==0) {
Break
}else{
printf ("Number of received bytes=%ld\n", size);
buffer[size]= ' + ';
printf ("%s\n", buffer);
if (Write (fd,buffer,sizeof (buffer)) <0) {
if (errno==epipe) {
Break
}
Perror ("Patrol error\n");
}
}
}
}

int main (int argc,char *argv[])
{
if (argc<2)
{
printf ("Usage:%s #port \ n", argv[0]);
Exit (1);
}
Signal Registration
Signal (Sigint,sign_handler);
Signal (Sigchld,sign_handler);
/*create socket*/
Sockfd=socket (af_inet,sock_stream,0);
/* BIND socket Address */
struct sockaddr_in serveraddr;
Serveraddr.sin_family=af_inet;
Serveraddr.sin_port=htons (Atoi (argv[1));
Serveraddr.sin_addr.s_addr=inaddr_any;
if (Bind (SOCKFD, (struct sockaddr*) &serveraddr,sizeof (serveraddr)) <0) {
Perror ("Socket bind fail\n");
Exit (1);
}
/*listen*/
if (Listen (sockfd,10) <0) {
Perror ("Socket Listen fail\n");
Exit (1);
}
/*accept*/
struct sockaddr_in clientaddr;
socklen_t clientaddr_len=sizeof (CLIENTADDR);
while (1)
{
int Fd=accept (SOCKFD, (struct sockaddr*) &clientaddr,&clientaddr_len);
if (fd<0) {
Perror ("Socket Accpet fail\n");
Exit (1);
}
/*fork Child progress*/
pid_t pid=fork ();
if (pid<0) {
Perror ("fork Child pid error\n");
Continue
}else if (pid==0) {
Close (SOCKFD);//SOCKFD off in a child process
printf ("Client from%s\n", Inet_ntoa (CLIENTADDR.SIN_ADDR));
SERVER_DO (FD);
Close (FD);
Break
}else{
Close (FD);
}
}
Close (SOCKFD);
return 0;
}



Echo_client

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <signal.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>



int main (int argc,char *argv[])
{
if (argc<3)
{
printf ("Usage #ip #port \ n");
Exit (1);
}

/* Create socket*/
int Sockfd=socket (af_inet,sock_stream,0);
if (sockfd<0)
{
Perror ("socket error");
Exit (1);
}
struct sockaddr_in serveraddr;
memset (&serveraddr,0,sizeof (SERVERADDR));
Serveraddr.sin_family=af_inet;
Serveraddr.sin_port=htons (Atoi (argv[2));
Inet_pton (AF_INET,ARGV[1],&AMP;SERVERADDR.SIN_ADDR.S_ADDR);
/**connect**/
if (Connect (SOCKFD, (struct sockaddr*) &serveraddr,sizeof (serveraddr)) <0)
{
Perror ("Socket connect fail\n");
Exit (1);
}
/* Bidirectional Communication */
Char Buff[bufsiz];
size_t size;
Char *prompt= ">";
while (1)
{
memset (buff,0,sizeof (buff));
Write (stdout_fileno,prompt,1);
Size=read (stdin_fileno,buff,sizeof (buff));
if (size<0) continue;
buff[size-1]= ' + ';

if (Write (sockfd,buff,sizeof (buff)) <0) {
Perror ("Write msg error\n");
Continue
}else{
if (read (sockfd,buff,sizeof (buff)) <0) {
Perror ("read msg error\n");
Continue
}else{
printf ("%s\n", buff);
}
}
}

}

Linux Network programming Echo server