[C함수]Select()

#include<sys/types.h>

#include<sys/time.h>

#include<sys/unistd.h>

int select (int n, fd_set * readfds, fd_set * writefds, fd_set * exceptfds, const struct timeval * timeout);

typedef struct fd_set{

u_int        fd_count

SOCKET    fd_array[FD_SETSIZE];

} fd_set;

void FD_ZERO (fd_set * fdset);

void FD_CLR (int fd, fd_set * fdset);

void FD_SET (int fd, fd_set * fdset);

void FD_ISSET (int fd, fd_set * fdset);