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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/linux/openat2.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _LINUX_OPENAT2_H
#define _LINUX_OPENAT2_H

#include <linux/types.h>

/*
 * Arguments for how openat2(2) should open the target path. If only @flags and
 * @mode are non-zero, then openat2(2) operates very similarly to openat(2).
 *
 * However, unlike openat(2), unknown or invalid bits in @flags result in
 * -EINVAL rather than being silently ignored. @mode must be zero unless one of
 * {O_CREAT, O_TMPFILE} are set.
 *
 * @flags: O_* flags.
 * @mode: O_CREAT/O_TMPFILE file mode.
 * @resolve: RESOLVE_* flags.
 */
struct open_how {
	__u64 flags;
	__u64 mode;
	__u64 resolve;
};

/* how->resolve flags for openat2(2). */
#define RESOLVE_NO_XDEV		0x01 /* Block mount-point crossings
					(includes bind-mounts). */
#define RESOLVE_NO_MAGICLINKS	0x02 /* Block traversal through procfs-style
					"magic-links". */
#define RESOLVE_NO_SYMLINKS	0x04 /* Block traversal through all symlinks
					(implies OEXT_NO_MAGICLINKS) */
#define RESOLVE_BENEATH		0x08 /* Block "lexical" trickery like
					"..", symlinks, and absolute
					paths which escape the dirfd. */
#define RESOLVE_IN_ROOT		0x10 /* Make all jumps to "/" and ".."
					be scoped inside the dirfd
					(similar to chroot(2)). */

#endif /* _LINUX_OPENAT2_H */

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