PROLOG

       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.

NAME

       ndbm.h — definitions for ndbm database operations

SYNOPSIS

       #include <ndbm.h>

DESCRIPTION

       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
       <sys/types.h>.

       The following sections are informative.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       <stddef.h>, <sys_types.h>

       The System Interfaces volume of POSIX.1‐2017, dbm_clearerr()

COPYRIGHT

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1-2017, Standard for Information Technology -- Portable  Operating  System  Interface
       (POSIX),  The  Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by
       the Institute of Electrical and Electronics Engineers, Inc and The  Open  Group.   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 http://www.opengroup.org/unix/online.html .

       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 https://www.kernel.org/doc/man-pages/reporting_bugs.html .