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。 sh-3ll

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/* Socket constants which vary among Linux architectures.
   Copyright (C) 2019-2021 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
   <https://www.gnu.org/licenses/>.  */

#ifndef _SYS_SOCKET_H
# error "Never include <bits/socket-constants.h> directly; use <sys/socket.h> instead."
#endif

#include <bits/timesize.h>

#define SOL_SOCKET 1
#define SO_ACCEPTCONN 30
#define SO_BROADCAST 6
#define SO_DONTROUTE 5
#define SO_ERROR 4
#define SO_KEEPALIVE 9
#define SO_LINGER 13
#define SO_OOBINLINE 10
#define SO_RCVBUF 8
#define SO_RCVLOWAT 18
#define SO_REUSEADDR 2
#define SO_SNDBUF 7
#define SO_SNDLOWAT 19
#define SO_TYPE 3

#if (__TIMESIZE == 64 && __WORDSIZE == 32 \
     && (!defined __SYSCALL_WORDSIZE || __SYSCALL_WORDSIZE == 32))
# define SO_RCVTIMEO 66
# define SO_SNDTIMEO 67
# define SO_TIMESTAMP 63
# define SO_TIMESTAMPNS 64
# define SO_TIMESTAMPING 65
#else
# if __TIMESIZE == 64
#  define SO_RCVTIMEO 20
#  define SO_SNDTIMEO 21
#  define SO_TIMESTAMP 29
#  define SO_TIMESTAMPNS 35
#  define SO_TIMESTAMPING 37
# else
#  define SO_RCVTIMEO_OLD 20
#  define SO_SNDTIMEO_OLD 21
#  define SO_RCVTIMEO_NEW 66
#  define SO_SNDTIMEO_NEW 67

#  define SO_TIMESTAMP_OLD 29
#  define SO_TIMESTAMPNS_OLD 35
#  define SO_TIMESTAMPING_OLD 37
#  define SO_TIMESTAMP_NEW 63
#  define SO_TIMESTAMPNS_NEW 64
#  define SO_TIMESTAMPING_NEW 65

#  ifdef __USE_TIME_BITS64
#   define SO_RCVTIMEO SO_RCVTIMEO_NEW
#   define SO_SNDTIMEO SO_SNDTIMEO_NEW
#   define SO_TIMESTAMP SO_TIMESTAMP_NEW
#   define SO_TIMESTAMPNS SO_TIMESTAMPNS_NEW
#   define SO_TIMESTAMPING SO_TIMESTAMPING_NEW
#  else
#   define SO_RCVTIMEO SO_RCVTIMEO_OLD
#   define SO_SNDTIMEO SO_SNDTIMEO_OLD
#   define SO_TIMESTAMP SO_TIMESTAMP_OLD
#   define SO_TIMESTAMPNS SO_TIMESTAMPNS_OLD
#   define SO_TIMESTAMPING SO_TIMESTAMPING_OLD
#  endif
# endif
#endif