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