C语言 AF_UNIX tcp/udp socket实例_udp af unix

========================udp 方式==========================

udp方式：

服务器端：

    #include <stdio.h>  
    #include <string.h>  
    #include <stdlib.h>  
    #include <unistd.h>  
    #include <sys/socket.h>  
    #include <sys/un.h>  
      
    #define PATH "./tt"  
      
    int main(int argc ,char *argv[])  
    {  
        int sockfd = 0;  
        struct sockaddr_un addr;  
        unlink(PATH);    
        addr.sun_family = AF_UNIX;  
        strcpy(addr.sun_path,PATH);  
      
        unsigned int len = strlen(addr.sun_path) + sizeof(addr.sun_family);  
        sockfd = socket(AF_UNIX,SOCK_DGRAM,0);  
        if(sockfd < 0 )  
        {  
            perror("socket error");  
            exit(-1);  
        }  
      
        if(bind(sockfd,(struct sockaddr *)&addr,len) < 0)  
        {  
            perror("bind error");  
            close(sockfd);  
            exit(-1);  
        }  
        printf("Bind is ok\n");  
      
        while(1)  
        {  
            char recv_buf[20] = "";  
            recvfrom(sockfd,recv_buf,sizeof(recv_buf),0,(struct sockaddr*)&addr,&len);  
            printf("Recv: %s\n",recv_buf);  
        }  
        return 0;  
      
    }  

client端：

    #include <stdio.h>  
    #include <string.h>  
    #include <unistd.h>  
    #include <stdlib.h>  
    #include <sys/socket.h>  
    #include <sys/un.h>  
      
    #define PATH "./tt"  
      
    int main(int argc,char *argv[])  
    {  
        int sockfd = 0;  
        struct sockaddr_un addr;  
        bzero(&addr,sizeof(addr));  
      
        addr.sun_family = AF_UNIX;  
        strcpy(addr.sun_path,PATH);  
      
        sockfd = socket(AF_UNIX,SOCK_DGRAM,0);  
        if(sockfd < 0)  
        {  
            perror("socket error");  
            exit(-1);  
        }  
      
        while(1)  
        {  
            static int counter = 0;  
            char send_buf[20] = "";  
            counter++;  
            sprintf(send_buf,"Counter is %d",counter);  
            int len = strlen(addr.sun_path)+sizeof(addr.sun_family);  
            sendto(sockfd,send_buf,strlen(send_buf),0,(struct sockaddr*)&addr,len);  
            printf("Send: %s\n",send_buf);  
            sleep(1);  
        }  
        return 0;  
    }