#include <stdio.h>                                                              
#include <sys/socket.h>                                                         
#include <sys/types.h>                                                          
	                                                                        
int main()
{         
    int fds_[1 + 1];
    socketpair(AF_UNIX,SOCK_STREAM,0,fds_);
	                             
    int type;
    socklen_t length = sizeof( int );
    getsockopt(fds_[0], SOL_SOCKET, SO_TYPE, &type, &length );
    printf("sock type %d",type);
    return 0;
}