Annotation of sys/sys/select.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: select.h,v 1.9 2006/03/21 08:17:33 otto Exp $ */
! 2:
! 3: /*-
! 4: * Copyright (c) 1992, 1993
! 5: * The Regents of the University of California. All rights reserved.
! 6: *
! 7: * Redistribution and use in source and binary forms, with or without
! 8: * modification, are permitted provided that the following conditions
! 9: * are met:
! 10: * 1. Redistributions of source code must retain the above copyright
! 11: * notice, this list of conditions and the following disclaimer.
! 12: * 2. Redistributions in binary form must reproduce the above copyright
! 13: * notice, this list of conditions and the following disclaimer in the
! 14: * documentation and/or other materials provided with the distribution.
! 15: * 3. Neither the name of the University nor the names of its contributors
! 16: * may be used to endorse or promote products derived from this software
! 17: * without specific prior written permission.
! 18: *
! 19: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 22: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 29: * SUCH DAMAGE.
! 30: *
! 31: * @(#)select.h 8.2 (Berkeley) 1/4/94
! 32: */
! 33:
! 34: #ifndef _SYS_SELECT_H_
! 35: #define _SYS_SELECT_H_
! 36:
! 37: #include <sys/cdefs.h>
! 38: #include <sys/time.h> /* for types and struct timeval */
! 39:
! 40: /*
! 41: * Select uses bit masks of file descriptors in longs. These macros
! 42: * manipulate such bit fields (the filesystem macros use chars).
! 43: * FD_SETSIZE may be defined by the user, but the default here should
! 44: * be enough for most uses.
! 45: */
! 46: #ifndef FD_SETSIZE
! 47: #define FD_SETSIZE 1024
! 48: #endif
! 49:
! 50: /*
! 51: * We don't want to pollute the namespace with select(2) internals.
! 52: * Non-underscore versions are exposed later #if __BSD_VISIBLE
! 53: */
! 54: #define __NBBY 8 /* number of bits in a byte */
! 55: typedef int32_t __fd_mask;
! 56: #define __NFDBITS ((unsigned)(sizeof(__fd_mask) * __NBBY)) /* bits per mask */
! 57: #define __howmany(x, y) (((x) + ((y) - 1)) / (y))
! 58:
! 59: typedef struct fd_set {
! 60: __fd_mask fds_bits[__howmany(FD_SETSIZE, __NFDBITS)];
! 61: } fd_set;
! 62:
! 63: #define FD_SET(n, p) \
! 64: ((p)->fds_bits[(n) / __NFDBITS] |= (1 << ((n) % __NFDBITS)))
! 65: #define FD_CLR(n, p) \
! 66: ((p)->fds_bits[(n) / __NFDBITS] &= ~(1 << ((n) % __NFDBITS)))
! 67: #define FD_ISSET(n, p) \
! 68: ((p)->fds_bits[(n) / __NFDBITS] & (1 << ((n) % __NFDBITS)))
! 69: #ifdef _KERNEL
! 70: #define FD_COPY(f, t) bcopy(f, t, sizeof(*(f)))
! 71: #define FD_ZERO(p) bzero(p, sizeof(*(p)))
! 72: #else
! 73: #define FD_COPY(f, t) memcpy(t, f, sizeof(*(f)))
! 74: #define FD_ZERO(p) memset(p, 0, sizeof(*(p)))
! 75: #endif
! 76:
! 77: #if __BSD_VISIBLE
! 78: #define NBBY __NBBY
! 79: #define fd_mask __fd_mask
! 80: #define NFDBITS __NFDBITS
! 81: #ifndef howmany
! 82: #define howmany(x, y) __howmany(x, y)
! 83: #endif
! 84: #endif /* __BSD_VISIBLE */
! 85:
! 86: #ifndef _KERNEL
! 87: #ifndef _SELECT_DEFINED_
! 88: #define _SELECT_DEFINED_
! 89: __BEGIN_DECLS
! 90: struct timeval;
! 91: int select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
! 92: __END_DECLS
! 93: #endif
! 94: #endif /* !_KERNEL */
! 95:
! 96: #endif /* !_SYS_SELECT_H_ */
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