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/* $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_ */ |