/* select.h
   Copyright 1998, 1999, 2000, 2001, 2005, 2009 Red Hat, Inc.

   Written by Geoffrey Noer <noer@cygnus.com>

This file is part of Cygwin.

This software is a copyrighted work licensed under the terms of the
Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
details. */

#ifndef _SYS_SELECT_H
#define _SYS_SELECT_H

/* We don't define fd_set and friends if we are compiling POSIX
   source, or if we have included (or may include as indicated
   by __USE_W32_SOCKETS) the W32api winsock[2].h header which
   defines Windows versions of them.   Note that a program which
   includes the W32api winsock[2].h header must know what it is doing;
   it must not call the Cygwin select function.
*/
# if !(defined (_POSIX_SOURCE) || defined (_WINSOCK_H) || defined (_WINSOCKAPI_) || defined (__USE_W32_SOCKETS))

#include <sys/cdefs.h>

#include <sys/_sigset.h>
#include <sys/_timeval.h>
#include <sys/timespec.h>

#if !defined(_SIGSET_T_DECLARED)
#define	_SIGSET_T_DECLARED
typedef	__sigset_t	sigset_t;
#endif

#  define _SYS_TYPES_FD_SET
/*
 * Select uses bit masks of file descriptors in longs.
 * These macros manipulate such bit fields (the filesystem macros use chars).
 * FD_SETSIZE may be defined by the user, but the default here
 * should be >= NOFILE (param.h).
 */
#  ifndef	FD_SETSIZE
#	define	FD_SETSIZE	64
#  endif

typedef	unsigned long	fd_mask;
#  define	NFDBITS	(sizeof (fd_mask) * 8)	/* 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)	(__extension__ (void)({ \
     size_t __i; \
     char *__tmp = (char *)p; \
     for (__i = 0; __i < sizeof (*(p)); ++__i) \
       *__tmp++ = 0; \
}))

#if !defined (__INSIDE_CYGWIN_NET__)

__BEGIN_DECLS

int select __P ((int __n, fd_set *__readfds, fd_set *__writefds,
		 fd_set *__exceptfds, struct timeval *__timeout));
int pselect __P ((int __n, fd_set *__readfds, fd_set *__writefds,
		  fd_set *__exceptfds, const struct timespec *__timeout,
		  const sigset_t *__set));

__END_DECLS

#endif

#endif /* !_POSIX_SOURCE, !__INSIDE_CYGWIN_NET__ */

#endif /* sys/select.h */
