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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Current File : //usr/include/bits/waitstatus.h
/* Definitions of status bits for `wait' et al.
   Copyright (C) 1992-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#if !defined _SYS_WAIT_H && !defined _STDLIB_H
# error "Never include <bits/waitstatus.h> directly; use <sys/wait.h> instead."
#endif


/* Everything extant so far uses these same bits.  */


/* If WIFEXITED(STATUS), the low-order 8 bits of the status.  */
#define	__WEXITSTATUS(status)	(((status) & 0xff00) >> 8)

/* If WIFSIGNALED(STATUS), the terminating signal.  */
#define	__WTERMSIG(status)	((status) & 0x7f)

/* If WIFSTOPPED(STATUS), the signal that stopped the child.  */
#define	__WSTOPSIG(status)	__WEXITSTATUS(status)

/* Nonzero if STATUS indicates normal termination.  */
#define	__WIFEXITED(status)	(__WTERMSIG(status) == 0)

/* Nonzero if STATUS indicates termination by a signal.  */
#define __WIFSIGNALED(status) \
  (((signed char) (((status) & 0x7f) + 1) >> 1) > 0)

/* Nonzero if STATUS indicates the child is stopped.  */
#define	__WIFSTOPPED(status)	(((status) & 0xff) == 0x7f)

/* Nonzero if STATUS indicates the child continued after a stop.  We only
   define this if <bits/waitflags.h> provides the WCONTINUED flag bit.  */
#ifdef WCONTINUED
# define __WIFCONTINUED(status)	((status) == __W_CONTINUED)
#endif

/* Nonzero if STATUS indicates the child dumped core.  */
#define	__WCOREDUMP(status)	((status) & __WCOREFLAG)

/* Macros for constructing status values.  */
#define	__W_EXITCODE(ret, sig)	((ret) << 8 | (sig))
#define	__W_STOPCODE(sig)	((sig) << 8 | 0x7f)
#define __W_CONTINUED		0xffff
#define	__WCOREFLAG		0x80

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