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/linux/hdlc/ioctl.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef __HDLC_IOCTL_H__
#define __HDLC_IOCTL_H__


#define GENERIC_HDLC_VERSION 4	/* For synchronization with sethdlc utility */

#define CLOCK_DEFAULT   0	/* Default setting */
#define CLOCK_EXT	1	/* External TX and RX clock - DTE */
#define CLOCK_INT	2	/* Internal TX and RX clock - DCE */
#define CLOCK_TXINT	3	/* Internal TX and external RX clock */
#define CLOCK_TXFROMRX	4	/* TX clock derived from external RX clock */


#define ENCODING_DEFAULT	0 /* Default setting */
#define ENCODING_NRZ		1
#define ENCODING_NRZI		2
#define ENCODING_FM_MARK	3
#define ENCODING_FM_SPACE	4
#define ENCODING_MANCHESTER	5


#define PARITY_DEFAULT		0 /* Default setting */
#define PARITY_NONE		1 /* No parity */
#define PARITY_CRC16_PR0	2 /* CRC16, initial value 0x0000 */
#define PARITY_CRC16_PR1	3 /* CRC16, initial value 0xFFFF */
#define PARITY_CRC16_PR0_CCITT	4 /* CRC16, initial 0x0000, ITU-T version */
#define PARITY_CRC16_PR1_CCITT	5 /* CRC16, initial 0xFFFF, ITU-T version */
#define PARITY_CRC32_PR0_CCITT	6 /* CRC32, initial value 0x00000000 */
#define PARITY_CRC32_PR1_CCITT	7 /* CRC32, initial value 0xFFFFFFFF */

#define LMI_DEFAULT		0 /* Default setting */
#define LMI_NONE		1 /* No LMI, all PVCs are static */
#define LMI_ANSI		2 /* ANSI Annex D */
#define LMI_CCITT		3 /* ITU-T Annex A */
#define LMI_CISCO		4 /* The "original" LMI, aka Gang of Four */

#ifndef __ASSEMBLY__

typedef struct {
	unsigned int clock_rate; /* bits per second */
	unsigned int clock_type; /* internal, external, TX-internal etc. */
	unsigned short loopback;
} sync_serial_settings;          /* V.35, V.24, X.21 */

typedef struct {
	unsigned int clock_rate; /* bits per second */
	unsigned int clock_type; /* internal, external, TX-internal etc. */
	unsigned short loopback;
	unsigned int slot_map;
} te1_settings;                  /* T1, E1 */

typedef struct {
	unsigned short encoding;
	unsigned short parity;
} raw_hdlc_proto;

typedef struct {
	unsigned int t391;
	unsigned int t392;
	unsigned int n391;
	unsigned int n392;
	unsigned int n393;
	unsigned short lmi;
	unsigned short dce; /* 1 for DCE (network side) operation */
} fr_proto;

typedef struct {
	unsigned int dlci;
} fr_proto_pvc;          /* for creating/deleting FR PVCs */

typedef struct {
	unsigned int dlci;
	char master[IFNAMSIZ];	/* Name of master FRAD device */
}fr_proto_pvc_info;		/* for returning PVC information only */

typedef struct {
    unsigned int interval;
    unsigned int timeout;
} cisco_proto;

/* PPP doesn't need any info now - supply length = 0 to ioctl */

#endif /* __ASSEMBLY__ */
#endif /* __HDLC_IOCTL_H__ */

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