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           #include <sys/types.h>
           #include <db.h>


           Note  well:  This  page documents interfaces provided in glibc up until
           version 2.1.  Since version 2.2, glibc no longer provides these  inter-
           faces.   Probably,  you  are looking for the APIs provided by the libdb
           library instead.
           The routine dbopen(3) is the library interface to database files.   One
           of  the  supported  file  formats  is record number files.  The general
           description of the database access methods is in dbopen(3), this manual
           page describes only the recno-specific information.
           The  record  number  data  structure is either variable or fixed-length
           records stored in a flat-file format, accessed by  the  logical  record
           number.   The  existence of record number five implies the existence of
           records one through four, and the deletion of record number one  causes
           record  number  five to be renumbered to record number four, as well as
           the cursor, if positioned after record number one, to  shift  down  one
           The  recno  access-method-specific data structure provided to dbopen(3)
           is defined in the <db.h> include file as follows:
               typedef struct {
                   unsigned long flags;
                   unsigned int  cachesize;
                   unsigned int  psize;
                   int           lorder;
                   size_t        reclen;
                   unsigned char bval;
                   char         *bfname;
               } RECNOINFO;
           The elements of this structure are defined as follows:
           flags  The flag value is specified by ORing any of the  following  val-
                         The  records  are  fixed-length, not byte delimited.  The
                         structure element reclen  specifies  the  length  of  the
                         record, and the structure element bval is used as the pad
                         character.  Any records, inserted into the database, that
                         are less than reclen bytes long are automatically padded.
                         In the interface specified by dbopen(3),  the  sequential
                         record  retrieval fills in both the caller's key and data
                         structures.  If the R_NOKEY flag is specified, the cursor
           psize  The  recno  access  method  stores  the  in-memory copies of its
                  records in a btree.  This value is the size (in  bytes)  of  the
                  pages  used for nodes in that tree.  If psize is 0 (no page size
                  is specified) a page size is  chosen  based  on  the  underlying
                  filesystem I/O block size.  See btree(3) for more information.
           lorder The  byte  order  for  integers in the stored database metadata.
                  The number should represent the order as an integer;  for  exam-
                  ple, big endian order would be the number 4,321.  If lorder is 0
                  (no order is specified) the current host order is used.
           reclen The length of a fixed-length record.
           bval   The delimiting byte to be used to mark the end of a  record  for
                  variable-length  records, and the pad character for fixed-length
                  records.  If no value is specified, newlines ("\n") are used  to
                  mark the end of variable-length records and fixed-length records
                  are padded with spaces.
           bfname The recno access method  stores  the  in-memory  copies  of  its
                  records  in  a  btree.   If bfname is non-NULL, it specifies the
                  name of the btree file, as if specified as the  filename  for  a
                  dbopen(3) of a btree file.
           The  data  part of the key/data pair used by the recno access method is
           the same as other access methods.  The  key  is  different.   The  data
           field  of  the  key  should  be  a pointer to a memory location of type
           recno_t, as defined in the <db.h> include file.  This type is  normally
           the  largest  unsigned  integral  type available to the implementation.
           The size field of the key should be the size of that type.
           Because there can be no metadata associated with the  underlying  recno
           access  method  files,  any  changes  made to the default values (e.g.,
           fixed record length or byte separator value) must be explicitly  speci-
           fied each time the file is opened.
           In  the  interface  specified  by dbopen(3), using the put interface to
           create a new record will cause the creation of multiple, empty  records
           if  the  record number is more than one greater than the largest record
           currently in the database.


           The recno access method routines may fail and set errno for any of  the
           errors specified for the library routine dbopen(3) or the following:
           EINVAL An  attempt  was made to add a record to a fixed-length database
                  that was too large to fit.


           Only big and little endian byte order is supported.

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