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/socket2.h
/* Checking macros for socket functions.
   Copyright (C) 2005-2018 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 _SYS_SOCKET_H
# error "Never include <bits/socket2.h> directly; use <sys/socket.h> instead."
#endif

extern ssize_t __recv_chk (int __fd, void *__buf, size_t __n, size_t __buflen,
			   int __flags);
extern ssize_t __REDIRECT (__recv_alias, (int __fd, void *__buf, size_t __n,
					  int __flags), recv);
extern ssize_t __REDIRECT (__recv_chk_warn,
			   (int __fd, void *__buf, size_t __n, size_t __buflen,
			    int __flags), __recv_chk)
     __warnattr ("recv called with bigger length than size of destination "
		 "buffer");

__fortify_function ssize_t
recv (int __fd, void *__buf, size_t __n, int __flags)
{
  size_t sz = __glibc_objsize0 (__buf);
  if (__glibc_safe_or_unknown_len (__n, sizeof (char), sz))
    return __recv_alias (__fd, __buf, __n, __flags);
  if (__glibc_unsafe_len (__n, sizeof (char), sz))
    return __recv_chk_warn (__fd, __buf, __n, sz, __flags);
  return __recv_chk (__fd, __buf, __n, sz, __flags);
}

extern ssize_t __recvfrom_chk (int __fd, void *__restrict __buf, size_t __n,
			       size_t __buflen, int __flags,
			       __SOCKADDR_ARG __addr,
			       socklen_t *__restrict __addr_len);
extern ssize_t __REDIRECT (__recvfrom_alias,
			   (int __fd, void *__restrict __buf, size_t __n,
			    int __flags, __SOCKADDR_ARG __addr,
			    socklen_t *__restrict __addr_len), recvfrom);
extern ssize_t __REDIRECT (__recvfrom_chk_warn,
			   (int __fd, void *__restrict __buf, size_t __n,
			    size_t __buflen, int __flags,
			    __SOCKADDR_ARG __addr,
			    socklen_t *__restrict __addr_len), __recvfrom_chk)
     __warnattr ("recvfrom called with bigger length than size of "
		 "destination buffer");

__fortify_function ssize_t
recvfrom (int __fd, void *__restrict __buf, size_t __n, int __flags,
	  __SOCKADDR_ARG __addr, socklen_t *__restrict __addr_len)
{
  size_t sz = __glibc_objsize0 (__buf);
  if (__glibc_safe_or_unknown_len (__n, sizeof (char), sz))
    return __recvfrom_alias (__fd, __buf, __n, __flags, __addr, __addr_len);
  if (__glibc_unsafe_len (__n, sizeof (char), sz))
    return __recvfrom_chk_warn (__fd, __buf, __n, sz, __flags, __addr,
				__addr_len);
  return __recvfrom_chk (__fd, __buf, __n, sz, __flags, __addr, __addr_len);
}

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