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Annotation of researchv10dc/man/manb/tp.5, revision 1.1.1.1

1.1       root        1: .TH TP 5 
                      2: .SH NAME
                      3: tp \- DEC/mag tape formats
                      4: .SH DESCRIPTION
                      5: .I Tp
                      6: dumps files to and extracts files from
                      7: DECtape and magtape.
                      8: The formats of these tapes are the same except
                      9: that magtapes have larger directories.
                     10: .PP
                     11: Block zero contains a
                     12: copy of a stand-alone bootstrap program.
                     13: See
                     14: .IR reboot (8).
                     15: .PP
                     16: Blocks 1 through 24
                     17: for DECtape (1 through 62 for magtape)
                     18: contain a directory of the tape.
                     19: There are 192 (resp. 496) entries in the directory;
                     20: 8 entries per block;
                     21: 64 bytes per entry.
                     22: Each entry has the following format:
                     23: .nf
                     24: .IP ""
                     25: .ta 8n +\w'unsigned short  'u
                     26: struct {
                     27:        char    pathname[32];
                     28:        unsigned short  mode;
                     29:        char    uid;
                     30:        char    gid;
                     31:        char    unused1;
                     32:        char    size[3];
                     33:        long    modtime;
                     34:        unsigned short  tapeaddr;
                     35:        char    unused2[16];
                     36:        unsigned short  checksum;
                     37: };
                     38: .fi
                     39: .DT
                     40: .PP
                     41: The path name entry is the path name of the
                     42: file when put on the tape.
                     43: If the pathname starts with a zero word,
                     44: the entry is empty.
                     45: It is at most 32 bytes long and ends in a null byte.
                     46: Mode, uid, gid, size and time modified
                     47: are the same as described under i-nodes 
                     48: (see file system
                     49: .IR filsys (5)).
                     50: The tape address is the tape block number of the start of
                     51: the contents of the file.
                     52: Every file
                     53: starts on a block boundary.
                     54: The file occupies (size+511)/512 blocks
                     55: of continuous tape.
                     56: The checksum entry has a value such that
                     57: the sum of the 32 words of the directory entry is zero.
                     58: .PP
                     59: Blocks above 25 (resp. 63) are available for file storage.
                     60: .PP
                     61: A fake entry
                     62: has a size of zero.
                     63: .SH "SEE ALSO"
                     64: filsys(5), tp(1)
                     65: .SH BUGS
                     66: The
                     67: .I pathname, uid, gid,
                     68: and
                     69: .I size
                     70: fields are too small.

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