dumpdates man page on NeXTSTEP

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DUMP(5)								       DUMP(5)

NAME
       dump, dumpdates - incremental dump format

SYNOPSIS
       #include <sys/types.h>
       #include <ufs/inode.h>
       #include <protocols/dumprestore.h>

DESCRIPTION
       Tapes used by dump and restore(8) contain:

	      a header record
	      two groups of bit map records
	      a group of records describing directories
	      a group of records describing files

       The  format  of	the  header  record  and  of  the first record of each
       description as given in the include file <protocols/dumprestore.h> is:

       #define NTREC	   10
       #define MLEN	   16
       #define MSIZ	   4096

       #define TS_TAPE	   1
       #define TS_INODE	   2
       #define TS_BITS	   3
       #define TS_ADDR	   4
       #define TS_END	   5
       #define TS_CLRI	   6
       #define MAGIC	   (int) 60011
       #define CHECKSUM	   (int) 84446

       struct	 spcl {
	    int	      c_type;
	    time_t	   c_date;
	    time_t	   c_ddate;
	    int	      c_volume;
	    daddr_t	   c_tapea;
	    ino_t	   c_inumber;
	    int	      c_magic;
	    int	      c_checksum;
	    struct	   dinode	  c_dinode;
	    int	      c_count;
	    char      c_addr[BSIZE];
       } spcl;

       struct	 idates {
	    char      id_name[16];
	    char      id_incno;
	    time_t	   id_ddate;
       };

       #define	 DUMPOUTFMT	"%-16s %c %s"	    /* for printf */
				     /* name, incno, ctime(date) */
       #define	 DUMPINFMT "%16s %c %[^\n]\n"  /* inverse for scanf */

       NTREC is the number of 1024 byte records	 in  a	physical  tape	block.
       MLEN  is	 the  number of bits in a bit map word.	 MSIZ is the number of
       bit map words.

       The TS_ entries are used in the c_type field to indicate what  sort  of
       header this is.	The types and their meanings are as follows:

       TS_TAPE	    Tape volume label
       TS_INODE	    A file or directory follows.  The c_dinode field is a copy
		    of the disk inode and contains bits telling what  sort  of
		    file this is.
       TS_BITS	    A  bit  map	 follows.  This bit map has a one bit for each
		    inode that was dumped.
       TS_ADDR	    A subrecord of a file description.	See c_addr below.
       TS_END	    End of tape record.
       TS_CLRI	    A bit map follows.	This bit map contains a zero  bit  for
		    all inodes that were empty on the file system when dumped.
       MAGIC	    All header records have this number in c_magic.
       CHECKSUM	    Header records checksum to this value.

       The fields of the header structure are as follows:

       c_type	    The type of the header.
       c_date	    The date the dump was taken.
       c_ddate	    The date the file system was dumped from.
       c_volume	    The current volume number of the dump.
       c_tapea	    The current number of this (1024-byte) record.
       c_inumber    The	 number	 of  the inode being dumped if this is of type
		    TS_INODE.
       c_magic	    This contains the value MAGIC above, truncated as needed.
       c_checksum   This contains whatever value is needed to make the	record
		    sum to CHECKSUM.
       c_dinode	    This  is  a	 copy  of  the inode as it appears on the file
		    system; see fs(5).
       c_count	    The count of characters in c_addr.
       c_addr	    An array of characters describing the blocks of the dumped
		    file.   A  character  is zero if the block associated with
		    that  character  was  not  present	on  the	 file  system,
		    otherwise the character is non-zero.  If the block was not
		    present on the file system, no block was dumped; the block
		    will  be  restored as a hole in the file.  If there is not
		    sufficient space in this record to	describe  all  of  the
		    blocks  in	a  file,  TS_ADDR  records  will  be scattered
		    through the file, each one picking up where the last  left
		    off.

       Each  volume  except  the  last ends with a tapemark (read as an end of
       file).  The last	 volume	 ends  with  a	TS_END	record	and  then  the
       tapemark.

       The  structure  idates  describes  an  entry in the file /etc/dumpdates
       where dump history is kept.  The fields of the structure are:

       id_name	The dumped filesystem is `/dev/id_nam'.
       id_incno The level number of the dump tape; see dump(8).
       id_ddate The  date  of  the  incremental	 dump  in  system  format  see
		types(5).

FILES
       /etc/dumpdates

SEE ALSO
       dump(8), restore(8), fs(5), types(5)

4th Berkeley Distribution	 June 18, 1985			       DUMP(5)
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