File: [local] / sys / sys / select.h (download)
Revision 1.1, Tue Mar 4 16:16:13 2008 UTC (16 years, 3 months ago) by nbrk
Branch point for: MAIN
Initial revision
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/* $OpenBSD: select.h,v 1.9 2006/03/21 08:17:33 otto 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.
*
* @(#)select.h 8.2 (Berkeley) 1/4/94
*/
#ifndef _SYS_SELECT_H_
#define _SYS_SELECT_H_
#include <sys/cdefs.h>
#include <sys/time.h> /* for types and struct timeval */
/*
* 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 1024
#endif
/*
* We don't want to pollute the namespace with select(2) internals.
* Non-underscore versions are exposed later #if __BSD_VISIBLE
*/
#define __NBBY 8 /* number of bits in a byte */
typedef int32_t __fd_mask;
#define __NFDBITS ((unsigned)(sizeof(__fd_mask) * __NBBY)) /* bits per mask */
#define __howmany(x, y) (((x) + ((y) - 1)) / (y))
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)))
#ifdef _KERNEL
#define FD_COPY(f, t) bcopy(f, t, sizeof(*(f)))
#define FD_ZERO(p) bzero(p, sizeof(*(p)))
#else
#define FD_COPY(f, t) memcpy(t, f, sizeof(*(f)))
#define FD_ZERO(p) memset(p, 0, sizeof(*(p)))
#endif
#if __BSD_VISIBLE
#define NBBY __NBBY
#define fd_mask __fd_mask
#define NFDBITS __NFDBITS
#ifndef howmany
#define howmany(x, y) __howmany(x, y)
#endif
#endif /* __BSD_VISIBLE */
#ifndef _KERNEL
#ifndef _SELECT_DEFINED_
#define _SELECT_DEFINED_
__BEGIN_DECLS
struct timeval;
int select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
__END_DECLS
#endif
#endif /* !_KERNEL */
#endif /* !_SYS_SELECT_H_ */