/*
	 * Process structure. A table of 1 proc structure
	 * per process is maintained in the kernel.
	 */
struct proc
	{
	UCHAR		args[8]; /* for ps */
	UCHAR		mode;	/* see below */
	UCHAR		uid;	/* for signal sending */
	UINT		event;	/* for sleep-wakeup */
	UINT		status; /* termination status */
	UINT *		frmptr; /* system stack frame pointer */
	UINT *		stkptr; /* system stack stack pointer */
	struct proc *	parent; /* parent proc structure */
	UINT		tty;	/* controlling terminal */
	UINT		swap;	/* disk address of swapped image */
	UCHAR		nsegs;	/* no. 4K memory segments */
	struct mem
	    {
	    UCHAR seg;
	    UCHAR per;
	    }		mem [17];	 /* memory map */
	UINT	     (* slist [NSIG])(); /* signal dispositions */

			/* nice and pri form a short */

	UCHAR		nice;	/* user decreasable priority */
	UCHAR		pri;	/* code priority (user or system) */

/*	UCHAR		pad;	/* pri-pad-cpu-nice form a long */
/*	UCHAR		cpu;	/* cpu priority, maintained by clock */

	UINT		time;	/* residency time in core or on disk */
	UINT		alarm;	/* seconds to alarm */
	int		pid;	/* process Id number */
	}
	plist[];

#define priority(p)	(*(unsigned short *)(&(p)->nice))

       /*
	* Mode bits
	*/
#define ALLOC	0001	/* this process entry is in use */
#define ALIVE	0002	/* not yet terminated */
#define AWAKE	0004	/* ready to run */
#define LOADED	0010	/* image is in core */
#define SWAPPED 0020	/* image is on disk */
#define LOCKED	0040	/* locked in core */
#define SYS	0100	/* in system phase */
#define BACK	0200	/* in background -- eof on tty reads */

	/*
	 * Memory map permission codes
	 */
#define NONE	0
#define FULL	3
#define GROW	7

       /*
	* User structure
	*/
struct user
	{
	UCHAR		s[512];		/* this processes' system stack */

	UINT		stack;		/* see trap0() in trap.c */
	UINT		ret;		/* dummy place holder */
	UCHAR		task;		/* Registers saved by firmware */
	UCHAR		mask;		/* at trap time. */
	UCHAR *		pc;
	UINT  *		sp;
	UINT		af;
	UINT		bc;
	UINT		de;
	UINT		hl;
	UCHAR		zregs[14];
	UCHAR		save;		/* dummy for top of save area */

	struct proc *	p;	/* this process */
	UCHAR		error;	/* see below */
	UCHAR		uid;	/* real user id */
	UCHAR		gid;	/* real group id */
	UCHAR		euid;	/* effective user id */
	UCHAR		egid;	/* effective group id */
	char*		brake;	/* end of code-data segment + 1 */
	int*		abort;	/* see docall (system.c) */
	struct inode *	cdir;	/* current directory */
	struct file*	olist [NOPEN];	 /* open files */
	struct inode *	iparent; /* temp for create, link */
	UCHAR		segflg; /* base in KERNEL or USER */
	ULONG		offset; /* for file access */
	char*		base;	/* ditto */
	UINT		count;	/* ditto */
	struct dir {
	   int	inum;
	   char name[14];
	   }		dir;		/* for directory searches */
	UINT		utime;		/* process user time */
	UINT		stime;		/* process system time */
	ULONG		cutime;		/* child user times */
	ULONG		cstime;		/* child system times */
	}
	u;

	/*
	 * Values for segflg
	 */
#define KSEG	1
#define USEG	0

       /*
	* error codes
	*/
#define EPERM	1
#define ENOENT	2
#define ESRCH	3
#define EINTR	4
#define EIO	5
#define ENXIO	6
#define E2BIG	7
#define ENOEXEC 8
#define EBADF	9
#define ECHILD	10
#define EAGAIN	11
#define ENOMEM	12
#define EACCES	13
#define ESYS	14
#define ENOTBLK 15
#define EBUSY	16
#define EEXIST	17
#define EXDEV	18
#define ENODEV	19
#define ENOTDIR 20
#define EISDIR	21
#define EINVAL	22
#define ENFILE	23
#define EMFILE	24
#define ENOTTY	25
#define ETXTBSY 26
#define EFBIG	27
#define ENOSPC	28
#define ESPIPE	29
#define EROFS	30
#define EMLINK	31
#define EPIPE	32