Socket set up simple top C/s program

Server-side

 
   #include  <stdio.h>

#include <arpa/inet.h>

#include  <sys/socket.h>

#include  <cstring>

#include   <sys/types.h>

#include   <stdlib.h>

#include   <netinet/in.h>

#include   <unistd.h>

int main (void)

{

    printf ("a1\n");

    int listenfd;//Create a socket

   if ((Listenfd=socket (PF_INET,SOCK_STREAM,IPPROTO_TCP)) <0)

       printf ("Socket errer");

    struct sockaddr_in servaddr;

    memset (&servaddr,0,sizeof (SERVADDR));

    Servaddr.sin_family=af_inet;

    Servaddr.sin_port=htons (5188);

    Servaddr.sin_addr.s_addr=htonl (Inaddr_any);//Initialize Address

    int on=1;

    if (setsockopt (listenfd,sol_socket,so_reuseaddr,&on,sizeof (ON)) <0)//Monitor

        printf ("setsockopt error");

if (bind (LISTENFD, struct sockaddr *) &servaddr,sizeof (SERVADDR))///BIND address

        printf ("Bind Errer");

    if (Listen (listenfd,somaxconn) <0)

        printf ("Listen Errer");

    struct sockaddr_in peeraddr;

    socklen_t peerlen=sizeof (PEERADDR);

    int conn;

    if ((Conn=accept (LISTENFD, (struct sockaddr*) &peeraddr,&peerlen) <0)

        printf ("Accept errer");

    printf ("ip=%s port=%d\n", Inet_ntoa (PEERADDR.SIN_ADDR), Ntohs (Peeraddr.sin_port));

    Char recvbuf[1024];

    while (1) {

        memset (recvbuf,0,sizeof (RECVBUF));

        int  ret =read (conn,recvbuf,sizeof (RECVBUF));

        Fputs (recvbuf,stdout);

        Write (Conn,recvbuf,ret);

    }

    Close (conn);

    Close (LISTENFD);

     printf ("a2\n");

    return 0;

}

Client

 
   #include  <stdio.h>

#include <arpa/inet.h>

#include  <sys/socket.h>

#include  <cstring>

#include   <sys/types.h>

#include   <stdlib.h>

#include   <netinet/in.h>

#include   <unistd.h>

int main (void)

{

    printf ("b1\n");

    int sock;

   if ((Sock=socket (PF_INET,SOCK_STREAM,IPPROTO_TCP)) <0)

       printf ("Socket errer");

    struct sockaddr_in servaddr;

    memset (&servaddr,0,sizeof (SERVADDR));

    Servaddr.sin_family=af_inet;

    Servaddr.sin_port=htons (5188);

    SERVADDR.SIN_ADDR.S_ADDR=INET_ADDR ("127.0.0.1");

   if (Connect (sock, (struct sockaddr*) &servaddr,sizeof (servaddr)) <0)

       printf ("Connect Errer");

   Char sendbuf[1024]={0};

   Char recvbuf[1024]={0};

   while (Fgets (sendbuf,sizeof (SENDBUF), stdin)!=null)

   {

       Write (Sock,sendbuf,strlen (SENDBUF));

       Read (Sock,recvbuf,strlen (RECVBUF));

        Fputs (recvbuf,stdout);

   }

   Close (sock);

    printf ("b2\n");

    return 0;

}

Socket set up simple top C/s program