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　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。 . Prv8 Shell

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Current File : //usr/include/X11/Xfuncproto.h

/*
 *
Copyright 1989, 1991, 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.
 *
 */

/* Definitions to make function prototypes manageable */

#ifndef _XFUNCPROTO_H_
#define _XFUNCPROTO_H_

#ifndef NeedFunctionPrototypes
#define NeedFunctionPrototypes 1
#endif /* NeedFunctionPrototypes */

#ifndef NeedVarargsPrototypes
#define NeedVarargsPrototypes 1
#endif /* NeedVarargsPrototypes */

#if NeedFunctionPrototypes

#ifndef NeedNestedPrototypes
#define NeedNestedPrototypes 1
#endif /* NeedNestedPrototypes */

#ifndef _Xconst
#define _Xconst const
#endif /* _Xconst */

/* Function prototype configuration (see configure for more info) */
#if !defined(NARROWPROTO) && \
    (defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__))
#define NARROWPROTO
#endif
#ifndef FUNCPROTO
#define FUNCPROTO 15
#endif

#ifndef NeedWidePrototypes
#ifdef NARROWPROTO
#define NeedWidePrototypes 0
#else
#define NeedWidePrototypes 1		/* default to make interropt. easier */
#endif
#endif /* NeedWidePrototypes */

#endif /* NeedFunctionPrototypes */

#ifndef _XFUNCPROTOBEGIN
#if defined(__cplusplus) || defined(c_plusplus) /* for C++ V2.0 */
#define _XFUNCPROTOBEGIN extern "C" {	/* do not leave open across includes */
#define _XFUNCPROTOEND }
#else
#define _XFUNCPROTOBEGIN
#define _XFUNCPROTOEND
#endif
#endif /* _XFUNCPROTOBEGIN */

/* http://clang.llvm.org/docs/LanguageExtensions.html#has-attribute */
#ifndef __has_attribute
# define __has_attribute(x) 0  /* Compatibility with non-clang compilers. */
#endif
#ifndef __has_feature
# define __has_feature(x) 0    /* Compatibility with non-clang compilers. */
#endif
#ifndef __has_extension
# define __has_extension(x) 0  /* Compatibility with non-clang compilers. */
#endif

/* Added in X11R6.9, so available in any version of modular xproto */
#if __has_attribute(__sentinel__) || (defined(__GNUC__) && (__GNUC__ >= 4))
# define _X_SENTINEL(x) __attribute__ ((__sentinel__(x)))
#else
# define _X_SENTINEL(x)
#endif /* GNUC >= 4 */

/* Added in X11R6.9, so available in any version of modular xproto */
#if (__has_attribute(visibility) || (defined(__GNUC__) && (__GNUC__ >= 4))) \
    && !defined(__CYGWIN__) && !defined(__MINGW32__)
# define _X_EXPORT      __attribute__((visibility("default")))
# define _X_HIDDEN      __attribute__((visibility("hidden")))
# define _X_INTERNAL    __attribute__((visibility("internal")))
#elif defined(__SUNPRO_C) && (__SUNPRO_C >= 0x550)
# define _X_EXPORT      __global
# define _X_HIDDEN      __hidden
# define _X_INTERNAL    __hidden
#else /* not gcc >= 4 and not Sun Studio >= 8 */
# define _X_EXPORT
# define _X_HIDDEN
# define _X_INTERNAL
#endif /* GNUC >= 4 */

/* Branch prediction hints for individual conditionals */
/* requires xproto >= 7.0.9 */
#if defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 303)
# define _X_LIKELY(x)   __builtin_expect(!!(x), 1)
# define _X_UNLIKELY(x) __builtin_expect(!!(x), 0)
#else /* not gcc >= 3.3 */
# define _X_LIKELY(x)   (x)
# define _X_UNLIKELY(x) (x)
#endif

/* Bulk branch prediction hints via marking error path functions as "cold" */
/* requires xproto >= 7.0.25 */
#if __has_attribute(__cold__) || \
    (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 403)) /* 4.3+ */
# define _X_COLD __attribute__((__cold__))
#else
# define _X_COLD /* nothing */
#endif

/* Added in X11R6.9, so available in any version of modular xproto */
#if __has_attribute(deprecated) \
    || (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 301)) \
    || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x5130))
# define _X_DEPRECATED  __attribute__((deprecated))
#else /* not gcc >= 3.1 */
# define _X_DEPRECATED
#endif

/* requires xproto >= 7.0.30 */
#if __has_extension(attribute_deprecated_with_message) || \
                (defined(__GNUC__) && ((__GNUC__ >= 5) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 5))))
# define _X_DEPRECATED_MSG(_msg) __attribute__((deprecated(_msg)))
#else
# define _X_DEPRECATED_MSG(_msg) _X_DEPRECATED
#endif

/* requires xproto >= 7.0.17 */
#if __has_attribute(noreturn) \
    || (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 205)) \
    || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
# define _X_NORETURN __attribute((noreturn))
#else
# define _X_NORETURN
#endif /* GNUC  */

/* Added in X11R6.9, so available in any version of modular xproto */
#if __has_attribute(__format__) \
    || defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 203)
# define _X_ATTRIBUTE_PRINTF(x,y) __attribute__((__format__(__printf__,x,y)))
#else /* not gcc >= 2.3 */
# define _X_ATTRIBUTE_PRINTF(x,y)
#endif

/* requires xproto >= 7.0.22 - since this uses either gcc or C99 variable
   argument macros, must be only used inside #ifdef _X_NONNULL guards, as
   many legacy X clients are compiled in C89 mode still. */
#if __has_attribute(nonnull) \
    && defined(__STDC_VERSION__) && (__STDC_VERSION__ - 0 >= 199901L) /* C99 */
#define _X_NONNULL(...)  __attribute__((nonnull(__VA_ARGS__)))
#elif __has_attribute(nonnull) \
    || defined(__GNUC__) &&  ((__GNUC__ * 100 + __GNUC_MINOR__) >= 303)
#define _X_NONNULL(args...)  __attribute__((nonnull(args)))
#elif defined(__STDC_VERSION__) && (__STDC_VERSION__ - 0 >= 199901L) /* C99 */
#define _X_NONNULL(...)  /* */
#endif

/* requires xproto >= 7.0.22 */
#if __has_attribute(__unused__) \
    || defined(__GNUC__) &&  ((__GNUC__ * 100 + __GNUC_MINOR__) >= 205)
#define _X_UNUSED  __attribute__((__unused__))
#else
#define _X_UNUSED  /* */
#endif

/* C99 keyword "inline" or equivalent extensions in pre-C99 compilers */
/* requires xproto >= 7.0.9
   (introduced in 7.0.8 but didn't support all compilers until 7.0.9) */
#if defined(inline) /* assume autoconf set it correctly */ || \
   (defined(__STDC_VERSION__) && (__STDC_VERSION__ - 0 >= 199901L)) /* C99 */ || \
   (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x550))
# define _X_INLINE inline
#elif defined(__GNUC__) && !defined(__STRICT_ANSI__) /* gcc w/C89+extensions */
# define _X_INLINE __inline__
#else
# define _X_INLINE
#endif

/* C99 keyword "restrict" or equivalent extensions in pre-C99 compilers */
/* requires xproto >= 7.0.21 */
#ifndef _X_RESTRICT_KYWD
# if defined(restrict) /* assume autoconf set it correctly */ || \
    (defined(__STDC_VERSION__) && (__STDC_VERSION__ - 0 >= 199901L) /* C99 */ \
     && !defined(__cplusplus)) /* Workaround g++ issue on Solaris */
#  define _X_RESTRICT_KYWD  restrict
# elif defined(__GNUC__) && !defined(__STRICT_ANSI__) /* gcc w/C89+extensions */
#  define _X_RESTRICT_KYWD __restrict__
# else
#  define _X_RESTRICT_KYWD
# endif
#endif

/* requires xproto >= 7.0.30 */
#if __has_attribute(no_sanitize_thread)
# define _X_NOTSAN __attribute__((no_sanitize_thread))
#else
# define _X_NOTSAN
#endif

#endif /* _XFUNCPROTO_H_ */

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