Linux+udp+server+client

First, the client

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <unistd.h>

#include <stdio.h>

#include <errno.h>

#include <time.h>

#include <string.h>

void Main ()

{

char send_data[20]= "IM sender data";

int FD;

struct sockaddr_in local_addr,to_addr;

fd=Socket(af_inet,scok_dgram,0);

if (fd<0)

{

printf ("Create socket Error");

Return

}

Local_addr.sin_family=af_inet;

Local_addr.sin_port=htons (7777);

Local_addr.sin_addr.s_addr=inaddr_any;

To_addr.sin_family=af_inet;

To_addr.sin_port=htons (8888);

To_addr.sin_addr.s_addr=inaddr_any;

if ( -1 = = bind(fd, (struct sockaddr*) &local_addr,sizeof (LOCAL_ADDR)))

{

printf ("Bind error\n);

Close (FD);

Return

}

printf ("bind success");

while (1)

{

Sleep (1);

if ( -1! = sendto(fd,send_data,sizeof (Send_data), 0, (struct sockaddr*) &to_addr,sizeof (TO_ADDR)))

printf ("Send success\n");

Else

printf ("Send error\n");

}

}

Second, the server

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <unistd.h>

#include <stdio.h>

#include <errno.h>

#include <time.h>

#include <string.h>

void Main ()

{

int FD;

int n;

Char rcv_buf[256];

Socklen_t Servlen;

struct sockaddr_in from_addr,temp_addr;

fd=Socket(as_inet,sock_dgram,0);

if (fd<0)

{

printf ("Create socket Error");

Return

}

From_addr.sin_family=af_inet;

From_addr.sin_port=htons (8888);

From_addr.sin_addr.s_addr=inaddr_any;

Servlen=sizeof (TEM_ADDR);

if ( -1 = = bind(FD, (struck sockaddr*) &from_addr,sizeof (struck sockaddr_in)))

{

printf ("Bind error");

Return

}

while (1)

{

Bzero (rcv_buf,256);

n=rcvfrom(fd,rcv_buf,256,0, (struct sockaddr*) &temp_addr,&servlen);

rcv_buf[n]=0;

printf ("rcvdata:%s\n", rcv_buf);

}

}

Linux+udp+server+client