138 lines
4.1 KiB
C
138 lines
4.1 KiB
C
/* $OpenBSD: select.h,v 1.17 2016/09/12 19:41:20 guenther 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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* @(#)select.h 8.2 (Berkeley) 1/4/94
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*/
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#ifndef _SYS_SELECT_H_
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#define _SYS_SELECT_H_
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#include <sys/types.h>
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#ifndef _TIMEVAL_DECLARED
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#define _TIMEVAL_DECLARED
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struct timeval {
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time_t tv_sec; /* seconds */
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suseconds_t tv_usec; /* and microseconds */
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};
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#endif
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#ifndef _TIMESPEC_DECLARED
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#define _TIMESPEC_DECLARED
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struct timespec {
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time_t tv_sec; /* seconds */
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long tv_nsec; /* and nanoseconds */
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};
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#endif
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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 1024
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#endif
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/*
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* We don't want to pollute the namespace with select(2) internals.
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* Non-underscore versions are exposed later #if __BSD_VISIBLE
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*/
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#define __NBBY 8 /* number of bits in a byte */
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typedef uint32_t __fd_mask;
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#define __NFDBITS ((unsigned)(sizeof(__fd_mask) * __NBBY)) /* bits per mask */
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#define __howmany(x, y) (((x) + ((y) - 1)) / (y))
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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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static __inline void
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__fd_set(int fd, fd_set *p)
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{
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p->fds_bits[fd / __NFDBITS] |= (1U << (fd % __NFDBITS));
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}
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#define FD_SET(n, p) __fd_set((n), (p))
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static __inline void
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__fd_clr(int fd, fd_set *p)
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{
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p->fds_bits[fd / __NFDBITS] &= ~(1U << (fd % __NFDBITS));
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}
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#define FD_CLR(n, p) __fd_clr((n), (p))
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static __inline int
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__fd_isset(int fd, const fd_set *p)
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{
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return (p->fds_bits[fd / __NFDBITS] & (1U << (fd % __NFDBITS)));
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}
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#define FD_ISSET(n, p) __fd_isset((n), (p))
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#if __BSD_VISIBLE
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#define FD_COPY(f, t) (void)(*(t) = *(f))
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#endif
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#define FD_ZERO(p) do { \
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fd_set *_p = (p); \
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__size_t _n = __howmany(FD_SETSIZE, __NFDBITS); \
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\
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while (_n > 0) \
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_p->fds_bits[--_n] = 0; \
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} while (0)
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#if __BSD_VISIBLE
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#define NBBY __NBBY
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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(x, y) __howmany(x, y)
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#endif
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#endif /* __BSD_VISIBLE */
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#ifndef _KERNEL
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#ifndef _SIGSET_T_DEFINED_
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#define _SIGSET_T_DEFINED_
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typedef unsigned int sigset_t;
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#endif
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#ifndef _SELECT_DEFINED_
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#define _SELECT_DEFINED_
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__BEGIN_DECLS
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int select(int, fd_set * __restrict, fd_set * __restrict,
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fd_set * __restrict, struct timeval * __restrict);
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int pselect(int, fd_set * __restrict, fd_set * __restrict,
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fd_set * __restrict, const struct timespec * __restrict,
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const sigset_t * __restrict);
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__END_DECLS
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#endif
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#endif /* !_KERNEL */
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#endif /* !_SYS_SELECT_H_ */
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