socket 在Unix domain的使用

server.c

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <sys/un.h>
#include <pthread.h>
#include <sys/syscall.h>

#define UNIX_DOMAIN "/tmp/test"


void *threaddeal(void *arg)
{
  printf("this is a new thread
");  
 　int  com_fd = *(int*)arg;
   char recv_buf[1024];
   memset(recv_buf,0,1024);
   char snd_buf[1024];
   memset(snd_buf,0,1024);
   strcpy(snd_buf,"server to client");
   int  num;
  while(num=read(com_fd,recv_buf,sizeof(recv_buf)))
  {
      printf("server recv  (%d)) :%s, threadid = %u,lwpid = %u
",num,recv_buf,pthread_self(),syscall(SYS_gettid));
      memset(recv_buf,0,1024);
      write(com_fd,snd_buf,sizeof(snd_buf));//回复client
  }
      close(com_fd);
}

int main(void)
{
    socklen_t clt_addr_len;
    int listen_fd;
    int com_fd;
    int ret;
    struct sockaddr_un clt_addr;
    struct sockaddr_un srv_addr;
    listen_fd=socket(PF_UNIX,SOCK_STREAM,0);
    if(listen_fd<0)
    {
        perror("cannot create communication socket");
        return 1;
    }

    //set server addr_param
    srv_addr.sun_family=AF_UNIX;
    strncpy(srv_addr.sun_path,UNIX_DOMAIN,sizeof(srv_addr.sun_path)-1);
    unlink(UNIX_DOMAIN);
    //bind sockfd & addr
    ret=bind(listen_fd,(struct sockaddr*)&srv_addr,sizeof(srv_addr));
    if(ret==-1)
    {
        perror("cannot bind server socket");
        close(listen_fd);
        unlink(UNIX_DOMAIN);
        return 1;
    }
    //listen sockfd
    ret=listen(listen_fd,1);
    if(ret==-1)
    {
        perror("cannot listen the client connect request");
        close(listen_fd);
        unlink(UNIX_DOMAIN);
        return 1;
    }
    //have connect request use accept
    clt_addr_len=sizeof(clt_addr);
    while(1)
　{
    com_fd=accept(listen_fd,(struct sockaddr*)&clt_addr,&clt_addr_len);
    if(com_fd<0)
    {
        perror("cannot accept client connect request");
        close(listen_fd);
        unlink(UNIX_DOMAIN);
        return 1;
    }
　　//开一个新线程处理新连接com_fd
    pthread_t threadid;   //线程的标识符
     if(pthread_create(&threadid,NULL,threaddeal,(void*)(&com_fd)) != 0)
     {
        perror("cannot creat new thread");
     }

}
    close(listen_fd);
    unlink(UNIX_DOMAIN);
    return 0;
}

client.c

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <pthread.h>

#define UNIX_DOMAIN "/tmp/test"


void *threaddeal(void *arg)
{
  printf("this is a new thread
");  
  int  com_fd = *(int*)arg;
   char recv_buf[1024];
   memset(recv_buf,0,1024);
   char snd_buf[1024];
   memset(snd_buf,0,1024);
  int num;
  while(num=read(com_fd,recv_buf,sizeof(recv_buf)))
  {
      printf("client recv : (%d)) :%s
",num,recv_buf);
      memset(recv_buf,0,1024);
  }
      close(com_fd);
}

int main(void)
{
    int connect_fd;
    int ret;
    char snd_buf[1024];
    struct sockaddr_un srv_addr;
//creat unix socket
    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);
//connect server
    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,"client send to server11111111111");

　　//开新线程处理server返回
    pthread_t threadid;   //线程的标识符
     if(pthread_create(&threadid,NULL,threaddeal,(void*)(&connect_fd)) != 0)
     {
        perror("cannot creat new thread");
     }
//send msg to server
    while(1){
            write(connect_fd,snd_buf,sizeof(snd_buf));
            sleep(2);
    }

    close(connect_fd);
    return 0;
}