socket domain 样例

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服务端

#include<stdio.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <stddef.h>
#include <string.h>
#include <stdlib.h>

#define LISTEN_SOCKET "/tmp/liuyi.sock"     //
#define LISTEN_BACKLOG 5
#define BIG_BUF 4096

int main()
{
   int listenfd,connfd;
   struct sockaddr_un un_s,un_c;
   int len;

   struct stat statbuf;
   uid_t uid;

   int ret;
   char recvBuf[BIG_BUF];
   char sendBuf[BIG_BUF];

   listenfd=socket(AF_UNIX, SOCK_STREAM, 0);
   if(listenfd<=0){
       perror("socket create error");
       exit(-1);
   }
   unlink(LISTEN_SOCKET);
   memset(&un_s,0,sizeof(struct sockaddr_un));
   un_s.sun_family = AF_UNIX;
   strcpy(un_s.sun_path, LISTEN_SOCKET);
   len = offsetof(struct sockaddr_un, sun_path) + strlen(LISTEN_SOCKET);
   if(bind(listenfd,(struct sockaddr *)&un_s, len)<0){
       perror("socket bind error");
       exit(-1);
   }
   if(listen(listenfd,LISTEN_BACKLOG)<0){
       perror("socket listen error");
       exit(-1);
   }
   memset(&un_c,0,sizeof(struct sockaddr_un));
   len=sizeof(struct sockaddr_un);
   connfd=accept(listenfd,(struct sockaddr *)&un_c,&len);
   if(connfd<=0){
       perror("socket accept error");
       exit(-1);
   }
   printf("connfd=[%d]\n",connfd);
   len -= offsetof(struct sockaddr_un, sun_path);
   un_c.sun_path[len] ='\0';
   //取文件状态
   if(stat(un_c.sun_path, &statbuf)<0){
       perror("stat error");
       exit(-1);
   }
   //判断是不是socket 文件   srwxr-xr-x 1 sandjmk   liuyi.sock
   if(S_ISSOCK(statbuf.st_mode) == 0){
       perror("Is not a socket");
       exit(-1);
   }
   printf("useid[%d]socket[%s]connect\n",statbuf.st_uid,un_c.sun_path);
   unlink(un_c.sun_path);

   memset(recvBuf,0,sizeof(recvBuf));
   ret = read(connfd,recvBuf,sizeof(recvBuf));
   printf("read ret[%d][%d]\n",ret,errno);
   printf("recv:[%s]\n",recvBuf);

   memset(sendBuf,'B',sizeof(sendBuf)-1);
   ret = write(connfd,sendBuf,sizeof(sendBuf));
   printf("write ret=[%d]\n",ret);

   close(connfd);

   return 0;
}

客户端

#include<stdio.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <stddef.h>
#include <string.h>
#include <stdlib.h>

#define SOCKET_PATH "/tmp/"
#define LISTEN_SOCKET "/tmp/liuyi.sock"
#define BIG_BUF 4096

int main()
{
   int connfd;
   struct sockaddr_un un_s,un_c;
   int len;
   int ret;

   char recvBuf[BIG_BUF];
   char sendBuf[BIG_BUF];
   connfd=socket(AF_UNIX, SOCK_STREAM, 0);
   if(connfd<=0){
       perror("socket create error");
       exit(-1);
   }
   memset(&un_s,0,sizeof(struct sockaddr_un));
   un_s.sun_family = AF_UNIX;
   sprintf(un_s.sun_path, "%sliuyi.%05d",SOCKET_PATH,getpid());
   len = offsetof(struct sockaddr_un, sun_path) + strlen(un_s.sun_path);
   unlink(un_s.sun_path);
   if(bind(connfd,(struct sockaddr *)&un_s, len)<0){
       perror("socket bind error");
       exit(-1);
   }
   memset(&un_s,0,sizeof(struct sockaddr_un));
   un_s.sun_family = AF_UNIX;
   sprintf(un_s.sun_path,LISTEN_SOCKET);
   len = offsetof(struct sockaddr_un, sun_path) + strlen(un_s.sun_path);
   if(connect(connfd,(struct sockaddr *)&un_s, len)<0){
       perror("socket connect error");
       exit(-1);
   }
   memset(sendBuf,'A',sizeof(sendBuf)-1);
   ret = write(connfd,sendBuf,sizeof(sendBuf));
   printf("write ret=[%d]\n",ret);
   //sleep(1);
   memset(recvBuf,0,sizeof(recvBuf));
   ret = read(connfd,recvBuf,sizeof(recvBuf));
   printf("read ret[%d][%d]\n",ret,errno);
   printf("recv:[%s]\n",recvBuf);

   return 0;
}

收藏于 2014-07-21

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