mirror of https://github.com/acidanthera/audk.git
108 lines
3.8 KiB
C
108 lines
3.8 KiB
C
/* $NetBSD: fd_set.h,v 1.2 2005/12/11 12:25:20 christos Exp $ */
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/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)types.h 8.4 (Berkeley) 1/21/94
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*/
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#ifndef _SYS_FD_SET_H_
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#define _SYS_FD_SET_H_
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#include <sys/EfiCdefs.h>
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#include <machine/int_types.h>
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/*
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* Implementation dependent defines, hidden from user space. X/Open does not
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* specify them.
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*/
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#define __NBBY 8 /* number of bits in a byte */
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typedef __int32_t __fd_mask;
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/* bits per mask */
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#define __NFDBITS ((unsigned int)sizeof(__fd_mask) * __NBBY)
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#define __howmany(x, y) (((x) + ((y) - 1)) / (y))
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/*
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* Select uses bit masks of file descriptors in longs. These macros
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* manipulate such bit fields (the filesystem macros use chars).
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* FD_SETSIZE may be defined by the user, but the default here should
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* be enough for most uses.
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*/
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#ifndef FD_SETSIZE
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#define FD_SETSIZE 256
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#endif
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typedef struct fd_set {
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__fd_mask fds_bits[__howmany(FD_SETSIZE, __NFDBITS)];
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} fd_set;
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#define FD_SET(n, p) \
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((p)->fds_bits[(n)/__NFDBITS] |= (1 << ((n) % __NFDBITS)))
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#define FD_CLR(n, p) \
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((p)->fds_bits[(n)/__NFDBITS] &= ~(1 << ((n) % __NFDBITS)))
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#define FD_ISSET(n, p) \
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((p)->fds_bits[(n)/__NFDBITS] & (1 << ((n) % __NFDBITS)))
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#if __GNUC_PREREQ__(2, 95)
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#define FD_ZERO(p) (void)__builtin_memset((p), 0, sizeof(*(p)))
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#else
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#define FD_ZERO(p) do { \
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fd_set *__fds = (p); \
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unsigned int __i; \
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for (__i = 0; __i < __howmany(FD_SETSIZE, __NFDBITS); __i++) \
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__fds->fds_bits[__i] = 0; \
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} while (/* CONSTCOND */ 0)
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#endif /* GCC 2.95 */
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/*
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* Expose our internals if we are not required to hide them.
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*/
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#if defined(_NETBSD_SOURCE)
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#define fd_mask __fd_mask
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#define NFDBITS __NFDBITS
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#ifndef howmany
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#define howmany(a, b) __howmany(a, b)
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#endif
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#if __GNUC_PREREQ__(2, 95)
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#define FD_COPY(f, t) (void)__builtin_memcpy((t), (f), sizeof(*(f)))
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#else
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#define FD_COPY(f, t) do { \
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fd_set *__f = (f), *__t = (t); \
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unsigned int __i; \
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for (__i = 0; __i < __howmany(FD_SETSIZE, __NFDBITS); __i++) \
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__t->fds_bits[__i] = __f->fds_bits[__i]; \
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} while (/* CONSTCOND */ 0)
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#endif /* GCC 2.95 */
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#endif /* _NETBSD_SOURCE */
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#endif /* _SYS_FD_SET_H_ */
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