ndbm.h - Man Page

definitions for ndbm database operations


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.


#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():


Insertion of new entries only.


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




Future Directions


See Also

<stddef.h>, <sys_types.h>

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

Referenced By


2017 IEEE/The Open Group POSIX Programmer's Manual