TP(5)								File Formats Manual							     TP(5)

NAME

       tp - DEC/mag tape formats

DESCRIPTION

       The  command  tp  dumps files to and extracts files from DECtape and magtape.  The formats of these tapes are the same except that magtapes
       have larger directories.

       Block zero contains a copy of a stand-alone bootstrap program.  See bproc(8).

       Blocks 1 through 24 for DECtape (1 through 62 for magtape) contain a directory of the tape.  There are  192  (resp.  496)  entries  in  the
       directory; 8 entries per block; 64 bytes per entry.  Each entry has the following format:

	      struct {
		   char pathname[32];
		   int	mode;
		   char uid;
		   char gid;
		   char unused1;
		   char size[3];
		   long modtime;
		   int	tapeaddr;
		   char unused2[16];
		   int	checksum;
	      };

       The path name entry is the path name of the file when put on the tape.  If the pathname starts with a zero word, the entry is empty.  It is
       at most 32 bytes long and ends in a null byte.  Mode, uid, gid, size and time modified are the same as described under  i-nodes	(see  file
       system  filsys(5)).   The  tape	address  is  the tape block number of the start of the contents of the file.  Every file starts on a block
       boundary.  The file occupies (size+511)/512 blocks of continuous tape.  The checksum entry has a value such that the sum of the 32 words of
       the directory entry is zero.

       Blocks above 25 (resp. 63) are available for file storage.

       A fake entry has a size of zero.

SEE ALSO

       filsys(5), tp(1)

BUGS

       The pathname, uid, gid, and size fields are too small.

																	     TP(5)