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/sigaction.h
/* The proper definitions for Linux's sigaction.
   Copyright (C) 1993-2018 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/>.  */

#ifndef _BITS_SIGACTION_H
#define _BITS_SIGACTION_H 1

#ifndef _SIGNAL_H
# error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
#endif

/* Structure describing the action to be taken when a signal arrives.  */
struct sigaction
  {
    /* Signal handler.  */
#if defined __USE_POSIX199309 || defined __USE_XOPEN_EXTENDED
    union
      {
	/* Used if SA_SIGINFO is not set.  */
	__sighandler_t sa_handler;
	/* Used if SA_SIGINFO is set.  */
	void (*sa_sigaction) (int, siginfo_t *, void *);
      }
    __sigaction_handler;
# define sa_handler	__sigaction_handler.sa_handler
# define sa_sigaction	__sigaction_handler.sa_sigaction
#else
    __sighandler_t sa_handler;
#endif

    /* Additional set of signals to be blocked.  */
    __sigset_t sa_mask;

    /* Special flags.  */
    int sa_flags;

    /* Restore handler.  */
    void (*sa_restorer) (void);
  };

/* Bits in `sa_flags'.  */
#define	SA_NOCLDSTOP  1		 /* Don't send SIGCHLD when children stop.  */
#define SA_NOCLDWAIT  2		 /* Don't create zombie on child death.  */
#define SA_SIGINFO    4		 /* Invoke signal-catching function with
				    three arguments instead of one.  */
#if defined __USE_XOPEN_EXTENDED || defined __USE_MISC
# define SA_ONSTACK   0x08000000 /* Use signal stack by using `sa_restorer'. */
#endif
#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
# define SA_RESTART   0x10000000 /* Restart syscall on signal return.  */
# define SA_NODEFER   0x40000000 /* Don't automatically block the signal when
				    its handler is being executed.  */
# define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler.  */
#endif
#ifdef __USE_MISC
# define SA_INTERRUPT 0x20000000 /* Historical no-op.  */

/* Some aliases for the SA_ constants.  */
# define SA_NOMASK    SA_NODEFER
# define SA_ONESHOT   SA_RESETHAND
# define SA_STACK     SA_ONSTACK
#endif

/* Values for the HOW argument to `sigprocmask'.  */
#define	SIG_BLOCK     0		 /* Block signals.  */
#define	SIG_UNBLOCK   1		 /* Unblock signals.  */
#define	SIG_SETMASK   2		 /* Set the set of blocked signals.  */

#endif

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