9p1.h

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

#define	DIRREC		116		/* size of a directory ascii record */
#define	ERRREC		64		/* size of a error record */
#define	MAXMSG		160	/* max header sans data */

typedef	struct	Oldfcall	Oldfcall;

struct	Oldfcall
{
	char	type;
	ushort	fid;
	short	err;
	short	tag;
	union
	{
		struct
		{
			short	uid;		/* T-Userstr */
			short	oldtag;		/* T-nFlush */
			Qid9p1	qid;		/* R-Attach, R-Clwalk, R-Walk,
						 * R-Open, R-Create */
			char	rauth[AUTHENTLEN];	/* R-attach */
		};
		struct
		{
			char	uname[NAMELEN];	/* T-nAttach */
			char	aname[NAMELEN];	/* T-nAttach */
			char	ticket[TICKETLEN];	/* T-attach */
			char	auth[AUTHENTLEN];	/* T-attach */
		};
		struct
		{
			char	ename[ERRREC];	/* R-nError */
			char	chal[CHALLEN];	/* T-session, R-session */
			char	authid[NAMELEN];	/* R-session */
			char	authdom[DOMLEN];	/* R-session */
		};
		struct
		{
			char	name[NAMELEN];	/* T-Walk, T-Clwalk, T-Create, T-Remove */
			long	perm;		/* T-Create */
			ushort	newfid;		/* T-Clone, T-Clwalk */
			char	mode;		/* T-Create, T-Open */
		};
		struct
		{
			long	offset;		/* T-Read, T-Write */
			long	count;		/* T-Read, T-Write, R-Read */
			char*	data;		/* T-Write, R-Read */
		};
		struct
		{
			char	stat[DIRREC];	/* T-Wstat, R-Stat */
		};
	};
};

/*
 * P9 protocol message types
 */
enum
{
	Tnop9p1 =		50,
	Rnop9p1,
	Tosession9p1 =	52,
	Rosession9p1,
	Terror9p1 =	54,	/* illegal */
	Rerror9p1,
	Tflush9p1 =	56,
	Rflush9p1,
	Toattach9p1 =	58,
	Roattach9p1,
	Tclone9p1 =	60,
	Rclone9p1,
	Twalk9p1 =		62,
	Rwalk9p1,
	Topen9p1 =		64,
	Ropen9p1,
	Tcreate9p1 =	66,
	Rcreate9p1,
	Tread9p1 =		68,
	Rread9p1,
	Twrite9p1 =	70,
	Rwrite9p1,
	Tclunk9p1 =	72,
	Rclunk9p1,
	Tremove9p1 =	74,
	Rremove9p1,
	Tstat9p1 =		76,
	Rstat9p1,
	Twstat9p1 =	78,
	Rwstat9p1,
	Tclwalk9p1 =	80,
	Rclwalk9p1,
	Tauth9p1 =		82,	/* illegal */
	Rauth9p1,			/* illegal */
	Tsession9p1 =	84,
	Rsession9p1,
	Tattach9p1 =	86,
	Rattach9p1,

	MAXSYSCALL
};

int	convD2M9p1(Dentry*, char*);
int	convM2D9p1(char*, Dentry*);
int	convM2S9p1(uchar*, Oldfcall*, int);
int	convS2M9p1(Oldfcall*, uchar*);
void	fcall9p1(Chan*, Oldfcall*, Oldfcall*);
int	authorize(Chan*, Oldfcall*, Oldfcall*);

void	(*call9p1[MAXSYSCALL])(Chan*, Oldfcall*, Oldfcall*);

extern Nvrsafe nvr;