晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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/*

Copyright 1994, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall
not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization
from The Open Group.

*/

/*
 * Copyright © 2005 Daniel Stone
 * 
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of Daniel Stone not be used in advertising
 * or publicity pertaining to distribution of the software without specific,
 * written prior permission.  Daniel Stone makes no representations about the
 * suitability of this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 *
 * DANIEL STONE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
 * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
 * DANIEL STONE BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
 * ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#ifndef _XPOLL_H_
#define _XPOLL_H_

#if !defined(WIN32) || defined(__CYGWIN__)

#ifndef USE_POLL

#include <X11/Xos.h>

#include <sys/select.h>  /* Get the FD_* macros. */

#include <X11/Xmd.h>

#ifdef CSRG_BASED
#include <sys/param.h>
# if BSD < 199103
typedef long fd_mask;
# endif
#endif

#if defined(FD_SETSIZE) && FD_SETSIZE < 512
# define XFD_SETSIZE	FD_SETSIZE
#else
# define XFD_SETSIZE	512
# ifndef FD_SETSIZE
#  define FD_SETSIZE	XFD_SETSIZE
# endif
#endif

#ifndef NBBY
#define NBBY	8		/* number of bits in a byte */
#endif

#ifndef NFDBITS
#define NFDBITS (sizeof(fd_mask) * NBBY)	/* bits per mask */
#endif

#ifndef howmany
#define howmany(x,y)	(((x)+((y)-1))/(y))
#endif

#if defined(BSD) && BSD < 198911 
typedef struct fd_set {
	fd_mask fds_bits[howmany(FD_SETSIZE, NFDBITS)];
} fd_set;
#endif

# define Select(n,r,w,e,t) select(n,(fd_set*)r,(fd_set*)w,(fd_set*)e,(struct timeval*)t)

#define __X_FDS_BITS __fds_bits

#ifndef __FDS_BITS
# define __FDS_BITS(p)  ((p)->__X_FDS_BITS)
#endif

#define __XFDS_BITS(p, n) (__FDS_BITS(p))[n]

#ifndef FD_SET
#define FD_SET(n, p)    (__XFDS_BITS(p, ((n)/NFDBITS)) |= ((fd_mask)1 << ((n) % NFDBITS)))
#endif
#ifndef FD_CLR
#define FD_CLR(n, p)    (__XFDS_BITS((p), ((n)/NFDBITS)) &= ~((fd_mask)1 << ((n) % NFDBITS)))
#endif
#ifndef FD_ISSET
#define FD_ISSET(n, p)  ((__XFDS_BITS((p), ((n)/NFDBITS))) & ((fd_mask)1 << ((n) % NFDBITS)))
#endif
#ifndef FD_ZERO
#define FD_ZERO(p)      bzero((char *)(p), sizeof(*(p)))
#endif

/*
 * The howmany(FD_SETSIZE, NFDBITS) computes the number of elements in the
 * array. before accessing an element in the array we check it exists.
 * If it does not exist then the compiler discards the code to access it. 
 */
#define XFD_ANYSET(p) \
        ((howmany(FD_SETSIZE, NFDBITS) > 0 && (__XFDS_BITS(p, 0))) || \
        (howmany(FD_SETSIZE, NFDBITS) > 1 && (__XFDS_BITS(p, 1))) || \
        (howmany(FD_SETSIZE, NFDBITS) > 2 && (__XFDS_BITS(p, 2))) || \
        (howmany(FD_SETSIZE, NFDBITS) > 3 && (__XFDS_BITS(p, 3))) || \
        (howmany(FD_SETSIZE, NFDBITS) > 4 && (__XFDS_BITS(p, 4))) || \
        (howmany(FD_SETSIZE, NFDBITS) > 5 && (__XFDS_BITS(p, 5))) || \
        (howmany(FD_SETSIZE, NFDBITS) > 6 && (__XFDS_BITS(p, 6))) || \
        (howmany(FD_SETSIZE, NFDBITS) > 7 && (__XFDS_BITS(p, 7))) || \
        (howmany(FD_SETSIZE, NFDBITS) > 8 && (__XFDS_BITS(p, 8))) || \
        (howmany(FD_SETSIZE, NFDBITS) > 9 && (__XFDS_BITS(p, 9))) || \
        (howmany(FD_SETSIZE, NFDBITS) > 10 && (__XFDS_BITS(p, 10))) || \
        (howmany(FD_SETSIZE, NFDBITS) > 11 && (__XFDS_BITS(p, 11))) || \
        (howmany(FD_SETSIZE, NFDBITS) > 12 && (__XFDS_BITS(p, 12))) || \
        (howmany(FD_SETSIZE, NFDBITS) > 13 && (__XFDS_BITS(p, 13))) || \
        (howmany(FD_SETSIZE, NFDBITS) > 14 && (__XFDS_BITS(p, 14))) || \
        (howmany(FD_SETSIZE, NFDBITS) > 15 && (__XFDS_BITS(p, 15))))


#define XFD_COPYSET(src,dst) { \
        int __i__; \
		for (__i__ = 0; __i__ < howmany(FD_SETSIZE, NFDBITS); __i__++) \
            __XFDS_BITS((dst), __i__) = __XFDS_BITS((src), __i__); \
        }
#define XFD_ANDSET(dst,b1,b2) { \
        int __i__; \
        for (__i__ = 0; __i__ < howmany(FD_SETSIZE, NFDBITS); __i__++) \
            __XFDS_BITS((dst), __i__) = ((__XFDS_BITS((b1), __i__)) & (__XFDS_BITS((b2), __i__))); \
        }
#define XFD_ORSET(dst,b1,b2) { \
        int __i__; \
        for (__i__ = 0; __i__ < howmany(FD_SETSIZE, NFDBITS); __i__++) \
		__XFDS_BITS((dst), __i__) = ((__XFDS_BITS((b1), __i__)) | (__XFDS_BITS((b2), __i__))); \
        }        
#define XFD_UNSET(dst,b1) { \
        int __i__; \
        for (__i__ = 0; __i__ < howmany(FD_SETSIZE, NFDBITS); __i__++) \
    		__XFDS_BITS((dst), __i__) &= ~(__XFDS_BITS((b1), __i__)); \
        }

#else /* USE_POLL */
#include <sys/poll.h>
#endif /* USE_POLL */

#else /* WIN32 */

#define XFD_SETSIZE	512
#ifndef FD_SETSIZE
#define FD_SETSIZE	XFD_SETSIZE
#endif
#include <X11/Xwinsock.h>

#define Select(n,r,w,e,t) select(0,(fd_set*)r,(fd_set*)w,(fd_set*)e,(struct timeval*)t)

#define XFD_SETCOUNT(p)	(((fd_set FAR *)(p))->fd_count)
#define XFD_FD(p,i) (((fd_set FAR *)(p))->fd_array[i])
#define XFD_ANYSET(p)	XFD_SETCOUNT(p)

#define XFD_COPYSET(src,dst) { \
    u_int __i; \
    FD_ZERO(dst); \
    for (__i = 0; __i < XFD_SETCOUNT(src) ; __i++) { \
        XFD_FD(dst,__i) = XFD_FD(src,__i); \
    } \
    XFD_SETCOUNT(dst) = XFD_SETCOUNT(src); \
}

#define XFD_ANDSET(dst,b1,b2) { \
    u_int __i; \
    FD_ZERO(dst); \
    for (__i = 0; __i < XFD_SETCOUNT(b1) ; __i++) { \
        if (FD_ISSET(XFD_FD(b1,__i), b2)) \
	   FD_SET(XFD_FD(b1,__i), dst); \
    } \
}

#define XFD_ORSET(dst,b1,b2) { \
    u_int __i; \
    if (dst != b1) XFD_COPYSET(b1,dst); \
    for (__i = 0; __i < XFD_SETCOUNT(b2) ; __i++) { \
        if (!FD_ISSET(XFD_FD(b2,__i), dst)) \
	   FD_SET(XFD_FD(b2,__i), dst); \
    } \
}

/* this one is really sub-optimal */
#define XFD_UNSET(dst,b1) { \
    u_int __i; \
    for (__i = 0; __i < XFD_SETCOUNT(b1) ; __i++) { \
	FD_CLR(XFD_FD(b1,__i), dst); \
    } \
}

/* we have to pay the price of having an array here, unlike with bitmasks
   calling twice FD_SET with the same fd is not transparent, so be careful */
#undef FD_SET
#define FD_SET(fd,set) do { \
    if (XFD_SETCOUNT(set) < FD_SETSIZE && !FD_ISSET(fd,set)) \
        XFD_FD(set,XFD_SETCOUNT(set)++)=(fd); \
} while(0)

#define getdtablesize() FD_SETSIZE 

#endif /* WIN32 */

#endif /* _XPOLL_H_ */

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