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/* $NetBSD: fd_set.h,v 1.7 2018/06/24 12:05:40 kamil Exp $ */
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)types.h 8.4 (Berkeley) 1/21/94
*/
#ifndef _SYS_FD_SET_H_
#define _SYS_FD_SET_H_
#include <sys/cdefs.h>
#include <sys/featuretest.h>
#include <machine/int_types.h>
/*
* Implementation dependent defines, hidden from user space.
* POSIX does not specify them.
*/
typedef __uint32_t __fd_mask;
/* 32 = 2 ^ 5 */
#define __NFDBITS (32)
#define __NFDSHIFT (5)
#define __NFDMASK (__NFDBITS - 1)
/*
* Select uses bit fields of file descriptors. These macros manipulate
* such bit fields. Note: FD_SETSIZE may be defined by the user.
*/
#ifndef FD_SETSIZE
#define FD_SETSIZE 256
#endif
#define __NFD_LEN(a) (((a) + (__NFDBITS - 1)) / __NFDBITS)
#define __NFD_SIZE __NFD_LEN(FD_SETSIZE)
#define __NFD_BYTES(a) (__NFD_LEN(a) * sizeof(__fd_mask))
typedef struct fd_set {
__fd_mask fds_bits[__NFD_SIZE];
} fd_set;
#define FD_SET(n, p) \
((p)->fds_bits[(unsigned)(n) >> __NFDSHIFT] |= (1U << ((n) & __NFDMASK)))
#define FD_CLR(n, p) \
((p)->fds_bits[(unsigned)(n) >> __NFDSHIFT] &= ~(1U << ((n) & __NFDMASK)))
#define FD_ISSET(n, p) \
((p)->fds_bits[(unsigned)(n) >> __NFDSHIFT] & (1U << ((n) & __NFDMASK)))
#if __GNUC_PREREQ__(2, 95)
#define FD_ZERO(p) (void)__builtin_memset((p), 0, sizeof(*(p)))
#else
#define FD_ZERO(p) do { \
fd_set *__fds = (p); \
unsigned int __i; \
for (__i = 0; __i < __NFD_SIZE; __i++) \
__fds->fds_bits[__i] = 0; \
} while (/* CONSTCOND */ 0)
#endif /* GCC 2.95 */
/*
* Expose our internals if we are not required to hide them.
*/
#if defined(_NETBSD_SOURCE)
#define fd_mask __fd_mask
#define NFDBITS __NFDBITS
#if __GNUC_PREREQ__(2, 95)
#define FD_COPY(f, t) (void)__builtin_memcpy((t), (f), sizeof(*(f)))
#else
#define FD_COPY(f, t) do { \
fd_set *__f = (f), *__t = (t); \
unsigned int __i; \
for (__i = 0; __i < __NFD_SIZE; __i++) \
__t->fds_bits[__i] = __f->fds_bits[__i]; \
} while (/* CONSTCOND */ 0)
#endif /* GCC 2.95 */
#endif /* _NETBSD_SOURCE */
#endif /* _SYS_FD_SET_H_ */
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