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 .