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More #include cleanup per POSIX:
 - <sys/types.h>: don't pull in <sys/select.h>
 - <sys/select.h>: don't pull in <sys/time.h>, but rather declare timeval
   and timespec locally
 - <sys/time.h>: *do* always pull in <sys/select.h>
 - <sys/socket.h>: declare timeval if __BSD_VISIBLE for struct splice

Ports testing and fixed by ajacoutot@
ok deraadt@ millert@

/*	$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_ */