/* Constants used by both the driver and user programs with the DOS:
 * pseudo-device on the Ersatz-11 PDP-11 emulator.
 */

/* Command codes and return code values */

#define	CC_E11		-1	/* execute E11 command */
#define CC_OPEN		0	/* open host file */
#define CC_CREAT	1	/* create host file */
#define CC_DEL		2	/* delete host file */
#define CC_READ		3	/* read host file */
#define CC_WRITE	4	/* write host file */
#define CC_SEEK		5	/* move file pointer */
#define CC_FIRST	6	/* find first matching file */
#define CC_NEXT		7	/* find next matching file */
#define CC_CLOSE	8	/* close host file */

#define RC_NXM		-1	/* bus timeout */
#define	RC_OK		0	/* success */
#define	RC_NOT		2	/* file or dir does not exist */
#define	RC_INVH		9	/* invalid handle */
#define	RC_INSM		12	/* insufficient memory */
#define	RC_PERM		13	/* permission denied */
#define	RC_FEX		17	/* file exists */
#define	RC_CROSS	18	/* cross-device link */
#define	RC_INV		22	/* invalid command or argument */
#define	RC_TOO		24	/* too many open files */
#define	RC_NOSPC	28	/* no space left on device */
#define	RC_RDEAD	36	/* resource deadlock would occur */

/* Open access/sharing mode code */

#define	CM_AMSK		03	/* Mask for access code */
#define	CM_SMSK		034	/* Mask for sharing code */

#define CM_RW		00
#define CM_RO		01
#define	CM_WO		02

#define CM_COMPAT	000	/* compatible (??) */
#define CM_NONE		004	/* deny none */
#define CM_READ		010	/* deny read */
#define CM_WRITE	014	/* deny write */
#define CM_EXCL		020	/* exclusive */

#define	CS_START	00	/* Seek from start of file */
#define	CS_CURR		01	/* Seek from current location */
#define	CS_END		02	/* Seek from current location */


/* Unix-specific stuff - stty() operation codes, etc */

#define	DC_CREAT	1		/* Memorial Unix spelling! */
#define	DC_FOPEN	2
#define	DC_SEEK		3
#define	DC_FCLOSE	4
#define	DC_FINDFST	5
#define	DC_FINDNXT	6
#define	DC_DEL		7
#define DC_HOST		8