Linux进程间通信：UDP

#include <stdio.h>    
#include <stdlib.h>    
#include <unistd.h>    
#include <netinet/in.h>    
#include <arpa/inet.h>    
        
int main(void)    
{    
    //create socket    
    int fd = socket(AF_INET, SOCK_DGRAM, 0);    
    if(fd==-1)    
    {    
        perror("socketn");    
        exit(-1);    
    }    
    printf("socket fd=%dn",fd);    
        
    //build connection address    
    struct sockaddr_in addr;    
    addr.sin_family = AF_INET;    
    addr.sin_port = htons(6666);    
    addr.sin_addr.s_addr = inet_addr("127.0.0.1");    
        
    int r;    
    r = bind(fd,(struct sockaddr*)&addr,sizeof(addr));    
    if(r==-1)    
    {    
        perror("bind");    
        close(fd);    
        exit(-1);    
    }    
    printf("bind address successful!n");    
    //accept or send message    
    char buf[255];    
    struct sockaddr_in from;    
    socklen_t len;    
    len = sizeof(from);    
    while(1)    
    {    
        r = recvfrom(fd,buf,sizeof(buf)-1,0,(struct sockaddr*)&from,&len);    
        if(r>0)    
        {    
            buf[r]=0;    
            printf("The message from %s is:%sn",inet_ntoa(from.sin_addr),buf);    
        }    
        else
        {    
            break;    
        }    
    }    
    //close socket    
    close(fd);    
    return 0;    
}

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