SERVER:
#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<errno.h>
#include<unistd.h>
int main(int argc,char *argv[])
{
socklen_t sid,clen;
char buffer[1024];
struct sockaddr_in saddr,caddr;int n;if(argc<2)
{
fprintf(stderr,"ERROR: port is not given \n");
exit(1);
}
sid=socket(AF_INET,SOCK_DGRAM,0);
if(sid<0) 
perror("socket_create");
bzero((char*)&saddr,sizeof(saddr));
saddr.sin_family=AF_INET;
saddr.sin_port=htons(atoi(argv[1]));
saddr.sin_addr.s_addr=INADDR_ANY;
if(bind(sid,(struct    sockaddr *)&saddr,sizeof(saddr))<0)
perror("socket_bind");
clen=sizeof(caddr);
bzero(buffer,1024);
n=recvfrom(sid,buffer,1023,0,(struct sockaddr*)&caddr,&clen);
if(n<0) 
perror("receive");
printf("The msg is %s", buffer);
close(sid);
return 0;
}









CLIENT:
#include <netdb.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
int main(int argc,char *argv[])
{
int sid,n;
char buffer[1024];
struct sockaddr_in saddr;
struct hostent *hen;
if(argc<3)
{
fprintf(stderr,”Error: Host name and port is not given \n”);
exit(1);
}
sid=socket(AF_INET,SOCK_DGRAM,0);
if(sid<0)
perror("Socket create");
hen=gethostbyname(argv[1]);
if(hen==NULL)
{
fprintf(stdout,"Host not found");
exit(1);
}
saddr.sin_family=AF_INET;
saddr.sin_port=htons(atoi(argv[2]));
bcopy((char *)hen->h_addr,(char *)&saddr.sin_addr.s_addr,hen->h_length);
if(bind(sid,(struct sockaddr *)&saddr,sizeof(saddr))<0) 
perror("Socket_bind");
printf("Enter the data u want to send : \n");
fgets(buffer,1023,stdin);
n=sendto(sid,buffer,1023,0,(struct sockaddr *)&saddr,sizeof(saddr));
if(n<0) 
perror(“Error in send to”);
close(sid);
return(0);
}