#ifndef _SYS_SELECT_H_#define _SYS_SELECT_H_ #define FD_SETSIZE 32typedef unsigned int fd_set; struct timeval;int select(int, fd_set*, fd_set*, fd_set*, struct timeval*); #define FD_SET(fd, s)  ((*s) |= (1<<(fd)))#define FD_CLR(fd, s) ((*s) &= ~(1<<(fd)))#define FD_ISSET(fd, s) (((*s) & (1<<(fd))) != 0)#define FD_ZERO(s) ((*s) = 0) #endif  // _SYS_SELECT_H_