structsockaddr_in{shortsin_family;/*Addressfamily一般来说AF_INET（地址族）PF_INET（协议族）*/unsignedshortsin_port;/*Portnumber(必须要采用网络数据格式,普通数字可以用htons()函数转换成网络数据格式的数字)*/structin_addrsin_addr;/*Internetaddress*/unsignedcharsin_zero[8];/*Samesizeasstructsockaddr没有实际意义,只是为了 跟SOCKADDR结构在内存中对齐*/};structsockaddr_in{#if(_WIN32_WINNT<0x0600)shortsin_family;#else//(_WIN32_WINNT<0x0600)address_familysin_family;#endif//(_WIN32_WINNT<0x0600)ushortsin_port;in_addrsin_addr;charsin_zero[8];}typedefstructin_addr{unsignedlongs_addr;};typedefstructin_addr{union{struct{unsignedchars_b1,s_b2,s_b3,s_b4;}S_un_b;struct{unsignedshorts_w1,s_w2;}S_un_w;unsignedlongS_addr;}S_un;}in_addr;服务端：
int main(){//创建socketintsockfd=socket(PF_LOCAL,SOCK_DGRAM,0);if(sockfd==-1)perror("创建socket失败"),exit(-1);//准备通信地址structsockaddr_unaddr;addr.sun_family=PF_UNIX;strcpy(addr.sun_path,"a.sock");//绑定intres=bind(sockfd,(structsockaddr*)&addr,sizeof(addr));if(res==-1)perror("绑定失败"),exit(-1);printf("绑定成功\n");//通信(用读写文件方式)charbuf[100]={};read(sockfd,buf,sizeof(buf));printf("收到信息:%s\n",buf);//关闭socketclose(sockfd);return0;}int main(){intsockfd=socket(PF_LOCAL,SOCK_DGRAM,0);if(sockfd==-1)perror("创建socket失败"),exit(-1);structsockaddr_unaddr;addr.sun_family=PF_UNIX;strcpy(addr.sun_path,"a.sock");//连接intres=connect(sockfd,(structsockaddr*)&addr,sizeof(addr));if(res==-1)perror("失败"),exit(-1);printf("成功\n");write(sockfd,"Hello,Socket!",14);close(sockfd);return0;}
原文：http://www.cnblogs.com/sky-of-chuanqingchen/p/4123401.html