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       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of
       this interface may differ (consult the corresponding Linux  manual  page  for  details  of
       Linux behavior), or the interface may not be implemented on Linux.


       ndbm.h — definitions for ndbm database operations


       #include <ndbm.h>


       The  <ndbm.h>  header  shall  define the datum type as a structure, which shall include at
       least the following members:

           void   *dptr  A pointer to the application's data.
           size_t  dsize The size of the object pointed to by dptr.

       The <ndbm.h> header shall define the size_t type as described in <stddef.h>.

       The <ndbm.h> header shall define the DBM type.

       The <ndbm.h> header shall define the following symbolic constants as possible  values  for
       the store_mode argument to dbm_store():

       DBM_INSERT    Insertion of new entries only.

       DBM_REPLACE   Allow replacing existing entries.

       The  following  shall be declared as functions and may also be defined as macros. Function
       prototypes shall be provided.

           int     dbm_clearerr(DBM *);
           void    dbm_close(DBM *);
           int     dbm_delete(DBM *, datum);
           int     dbm_error(DBM *);
           datum   dbm_fetch(DBM *, datum);
           datum   dbm_firstkey(DBM *);
           datum   dbm_nextkey(DBM *);
           DBM    *dbm_open(const char *, int, mode_t);
           int     dbm_store(DBM *, datum, datum, int);

       The <ndbm.h> header shall  define  the  mode_t  type  through  typedef,  as  described  in

       The following sections are informative.








       <stddef.h>, <sys_types.h>

       The System Interfaces volume of POSIX.1‐2008, dbm_clearerr()


       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2013 Edition, Standard for Information Technology  --  Portable  Operating  System
       Interface  (POSIX),  The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc  and  The  Open  Group.   (This  is
       POSIX.1-2008  with  the  2013  Technical  Corrigendum  1  applied.)  In  the  event of any
       discrepancy between this version and the original IEEE and The Open  Group  Standard,  the
       original  IEEE  and The Open Group Standard is the referee document. The original Standard
       can be obtained online at .

       Any typographical or formatting errors that appear in this page are most  likely  to  have
       been  introduced  during  the conversion of the source files to man page format. To report
       such errors, see .