/* $NetBSD: fd_set.h,v 1.2 2005/12/11 12:25:20 christos 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/EfiCdefs.h> | |
#include <machine/int_types.h> | |
/* | |
* Implementation dependent defines, hidden from user space. X/Open does not | |
* specify them. | |
*/ | |
#define __NBBY 8 /* number of bits in a byte */ | |
typedef __int32_t __fd_mask; | |
/* bits per mask */ | |
#define __NFDBITS ((unsigned int)sizeof(__fd_mask) * __NBBY) | |
#define __howmany(x, y) (((x) + ((y) - 1)) / (y)) | |
/* | |
* 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 enough for most uses. | |
*/ | |
#ifndef FD_SETSIZE | |
#define FD_SETSIZE 256 | |
#endif | |
typedef struct fd_set { | |
__fd_mask fds_bits[__howmany(FD_SETSIZE, __NFDBITS)]; | |
} fd_set; | |
#define FD_SET(n, p) \ | |
((p)->fds_bits[(n)/__NFDBITS] |= (1 << ((n) % __NFDBITS))) | |
#define FD_CLR(n, p) \ | |
((p)->fds_bits[(n)/__NFDBITS] &= ~(1 << ((n) % __NFDBITS))) | |
#define FD_ISSET(n, p) \ | |
((p)->fds_bits[(n)/__NFDBITS] & (1 << ((n) % __NFDBITS))) | |
#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 < __howmany(FD_SETSIZE, __NFDBITS); __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 | |
#ifndef howmany | |
#define howmany(a, b) __howmany(a, b) | |
#endif | |
#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 < __howmany(FD_SETSIZE, __NFDBITS); __i++) \ | |
__t->fds_bits[__i] = __f->fds_bits[__i]; \ | |
} while (/* CONSTCOND */ 0) | |
#endif /* GCC 2.95 */ | |
#endif /* _NETBSD_SOURCE */ | |
#endif /* _SYS_FD_SET_H_ */ |