/*
 * Copyright (C) 2015-2017 Alibaba Group Holding Limited
 */

#ifndef _SYS_SELECT_H__
#define _SYS_SELECT_H__

#ifndef	FD_SETSIZE
#define	FD_SETSIZE	256
#endif

#define	NBBY	8		/* number of bits in a byte */

typedef	long	fd_mask;
#define	NFDBITS	(sizeof (fd_mask) * NBBY)	/* bits per mask */
#ifndef	howmany
#define	howmany(x,y)	(((x)+((y)-1))/(y))
#endif

/* We use a macro for fd_set so that including Sockets.h afterwards
   can work.  */
typedef	struct _types_fd_set {
	fd_mask	fds_bits[howmany(FD_SETSIZE, NFDBITS)];
} _types_fd_set;

#define fd_set _types_fd_set

#define	FD_SET(n, p)	((p)->fds_bits[(n)/NFDBITS] |= (1L << ((n) % NFDBITS)))
#define	FD_CLR(n, p)	((p)->fds_bits[(n)/NFDBITS] &= ~(1L << ((n) % NFDBITS)))
#define	FD_ISSET(n, p)	((p)->fds_bits[(n)/NFDBITS] & (1L << ((n) % NFDBITS)))
#define FD_ZERO(p)      memset((void*)(p), 0, sizeof(*(p)))

#endif