13.3.2 客户端实现

   
//p13.3.c UNIX域通信代码示例，客户端
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
//定义用于通信的文件名
#define UNIX_DOMAIN "/tmp/UNIX.domain"
int main(void)
{
int connect_fd;
int ret;
char snd_buf[1024];
int i;
static struct sockaddr_un srv_addr;
//创建用于通信的套接字，通信域为UNIX通信域
connect_fd=socket(PF_UNIX,SOCK_STREAM,0);
if(connect_fd<0){
perror("cannot create communication socket");
return 1;
} 
srv_addr.sun_family=AF_UNIX;
strcpy(srv_addr.sun_path,UNIX_DOMAIN);
//连接服务器
ret=connect(connect_fd,(struct sockaddr*)&srv_addr,sizeof(srv_addr));
if(ret==-1){
perror("cannot connect to the server");
close(connect_fd);
return 1;
}

memset(snd_buf,0,1024);
strcpy(snd_buf,"message from client");
//给服务器发送消息
for(i=0;i<4;i++)
write(connect_fd,snd_buf,sizeof(snd_buf));

close(connect_fd);
return 0;
}