home *** CD-ROM | disk | FTP | other *** search
- /*************************************************************************
- *
- * tape390.h
- * enables user programs to display messages on the tape device
- *
- * S390 and zSeries version
- * Copyright (C) 2001 IBM Corporation
- * Author(s): Despina Papadopoulou <despina_p@de.ibm.com>
- *
- *************************************************************************/
-
- #ifndef _TAPE390_H
- #define _TAPE390_H
-
- #define TAPE390_DISPLAY _IOW('d', 1, struct display_struct)
-
- /*
- * The TAPE390_DISPLAY ioctl calls the Load Display command
- * which transfers 17 bytes of data from the channel to the subsystem:
- * - 1 format control byte, and
- * - two 8-byte messages
- *
- * Format control byte:
- * 0-2: New Message Overlay
- * 3: Alternate Messages
- * 4: Blink Message
- * 5: Display Low/High Message
- * 6: Reserved
- * 7: Automatic Load Request
- *
- */
-
- typedef struct display_struct {
- char cntrl;
- char message1[8];
- char message2[8];
- } display_struct;
-
- #endif
-