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/asm-generic/socket.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef __ASM_GENERIC_SOCKET_H
#define __ASM_GENERIC_SOCKET_H

#include <asm/sockios.h>

/* For setsockopt(2) */
#define SOL_SOCKET	1

#define SO_DEBUG	1
#define SO_REUSEADDR	2
#define SO_TYPE		3
#define SO_ERROR	4
#define SO_DONTROUTE	5
#define SO_BROADCAST	6
#define SO_SNDBUF	7
#define SO_RCVBUF	8
#define SO_SNDBUFFORCE	32
#define SO_RCVBUFFORCE	33
#define SO_KEEPALIVE	9
#define SO_OOBINLINE	10
#define SO_NO_CHECK	11
#define SO_PRIORITY	12
#define SO_LINGER	13
#define SO_BSDCOMPAT	14
#define SO_REUSEPORT	15
#ifndef SO_PASSCRED /* powerpc only differs in these */
#define SO_PASSCRED	16
#define SO_PEERCRED	17
#define SO_RCVLOWAT	18
#define SO_SNDLOWAT	19
#define SO_RCVTIMEO	20
#define SO_SNDTIMEO	21
#endif

/* Security levels - as per NRL IPv6 - don't actually do anything */
#define SO_SECURITY_AUTHENTICATION		22
#define SO_SECURITY_ENCRYPTION_TRANSPORT	23
#define SO_SECURITY_ENCRYPTION_NETWORK		24

#define SO_BINDTODEVICE	25

/* Socket filtering */
#define SO_ATTACH_FILTER	26
#define SO_DETACH_FILTER	27
#define SO_GET_FILTER		SO_ATTACH_FILTER

#define SO_PEERNAME		28
#define SO_TIMESTAMP		29
#define SCM_TIMESTAMP		SO_TIMESTAMP

#define SO_ACCEPTCONN		30

#define SO_PEERSEC		31
#define SO_PASSSEC		34
#define SO_TIMESTAMPNS		35
#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS

#define SO_MARK			36

#define SO_TIMESTAMPING		37
#define SCM_TIMESTAMPING	SO_TIMESTAMPING

#define SO_PROTOCOL		38
#define SO_DOMAIN		39

#define SO_RXQ_OVFL             40

#define SO_WIFI_STATUS		41
#define SCM_WIFI_STATUS	SO_WIFI_STATUS
#define SO_PEEK_OFF		42

/* Instruct lower device to use last 4-bytes of skb data as FCS */
#define SO_NOFCS		43

#define SO_LOCK_FILTER		44

#define SO_SELECT_ERR_QUEUE	45

#define SO_BUSY_POLL		46

#define SO_MAX_PACING_RATE	47

#define SO_BPF_EXTENSIONS	48

#define SO_INCOMING_CPU		49

#define SO_ATTACH_BPF		50
#define SO_DETACH_BPF		SO_DETACH_FILTER

#define SO_ATTACH_REUSEPORT_CBPF	51
#define SO_ATTACH_REUSEPORT_EBPF	52

#define SO_CNX_ADVICE		53

#define SCM_TIMESTAMPING_OPT_STATS	54

#define SO_MEMINFO		55

#define SO_INCOMING_NAPI_ID	56

#define SO_COOKIE		57

#define SCM_TIMESTAMPING_PKTINFO	58

#define SO_PEERGROUPS		59

#define SO_ZEROCOPY		60

#define SO_TXTIME		61
#define SCM_TXTIME		SO_TXTIME

#define SO_BINDTOIFINDEX	62

#define SO_DETACH_REUSEPORT_BPF 68

#define SO_PREFER_BUSY_POLL	69
#define SO_BUSY_POLL_BUDGET	70

#endif /* __ASM_GENERIC_SOCKET_H */

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