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/* sysselect.h - System-dependent definitions for the select function.
Copyright (C) 1995, 2001-2013 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
#ifndef EMACS_SYSSELECT_H
#define EMACS_SYSSELECT_H
#ifndef DOS_NT
#include <sys/select.h>
#endif
#ifdef WINDOWSNT
/* File descriptor set emulation. */
/* MSVC runtime library has limit of 64 descriptors by default */
#define FD_SETSIZE 64
typedef struct {
unsigned int bits[FD_SETSIZE / 32];
} fd_set;
/* standard access macros */
#define FD_SET(n, p) \
do { \
if ((n) < FD_SETSIZE) { \
(p)->bits[(n)/32] |= (1 << (n)%32); \
} \
} while (0)
#define FD_CLR(n, p) \
do { \
if ((n) < FD_SETSIZE) { \
(p)->bits[(n)/32] &= ~(1 << (n)%32); \
} \
} while (0)
#define FD_ISSET(n, p) ((n) < FD_SETSIZE ? ((p)->bits[(n)/32] & (1 << (n)%32)) : 0)
#define FD_ZERO(p) memset((p), 0, sizeof(fd_set))
#define SELECT_TYPE fd_set
#include "systime.h"
extern int sys_select (int, SELECT_TYPE *, SELECT_TYPE *, SELECT_TYPE *,
EMACS_TIME *, sigset_t *);
#else /* not WINDOWSNT */
#ifdef FD_SET
#ifdef FD_SETSIZE
#define MAXDESC FD_SETSIZE
#else
#define MAXDESC 64
#endif
#define SELECT_TYPE fd_set
#else /* no FD_SET */
#define MAXDESC 32
#define SELECT_TYPE int
/* Define the macros to access a single-int bitmap of descriptors. */
#define FD_SET(n, p) (*(p) |= (1 << (n)))
#define FD_CLR(n, p) (*(p) &= ~(1 << (n)))
#define FD_ISSET(n, p) (*(p) & (1 << (n)))
#define FD_ZERO(p) (*(p) = 0)
#endif /* no FD_SET */
#endif /* not WINDOWSNT */
#if !defined (HAVE_SELECT)
#define select sys_select
#endif
#ifdef MSDOS
#define pselect sys_select
#endif
#endif /* EMACS_SYSSELECT_H */
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