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/* $OpenBSD: select.h,v 1.17 2016/09/12 19:41:20 guenther 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/types.h>
#ifndef _TIMEVAL_DECLARED
#define _TIMEVAL_DECLARED
struct timeval {
time_t tv_sec; /* seconds */
suseconds_t tv_usec; /* and microseconds */
};
#endif
#ifndef _TIMESPEC_DECLARED
#define _TIMESPEC_DECLARED
struct timespec {
time_t tv_sec; /* seconds */
long tv_nsec; /* and nanoseconds */
};
#endif
/*
* 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 uint32_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;
static __inline void
__fd_set(int fd, fd_set *p)
{
p->fds_bits[fd / __NFDBITS] |= (1U << (fd % __NFDBITS));
}
#define FD_SET(n, p) __fd_set((n), (p))
static __inline void
__fd_clr(int fd, fd_set *p)
{
p->fds_bits[fd / __NFDBITS] &= ~(1U << (fd % __NFDBITS));
}
#define FD_CLR(n, p) __fd_clr((n), (p))
static __inline int
__fd_isset(int fd, const fd_set *p)
{
return (p->fds_bits[fd / __NFDBITS] & (1U << (fd % __NFDBITS)));
}
#define FD_ISSET(n, p) __fd_isset((n), (p))
#if __BSD_VISIBLE
#define FD_COPY(f, t) (void)(*(t) = *(f))
#endif
#define FD_ZERO(p) do { \
fd_set *_p = (p); \
__size_t _n = __howmany(FD_SETSIZE, __NFDBITS); \
\
while (_n > 0) \
_p->fds_bits[--_n] = 0; \
} while (0)
#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 _SIGSET_T_DEFINED_
#define _SIGSET_T_DEFINED_
typedef unsigned int sigset_t;
#endif
#ifndef _SELECT_DEFINED_
#define _SELECT_DEFINED_
__BEGIN_DECLS
int select(int, fd_set * __restrict, fd_set * __restrict,
fd_set * __restrict, struct timeval * __restrict);
int pselect(int, fd_set * __restrict, fd_set * __restrict,
fd_set * __restrict, const struct timespec * __restrict,
const sigset_t * __restrict);
__END_DECLS
#endif
#endif /* !_KERNEL */
#endif /* !_SYS_SELECT_H_ */
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