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The <ndbm.h> header
defines the datum type as a structure that includes at least the following members:
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void *dptr /* pointer to the application's data */
size_t dsize /* size of the object pointed to by dptr */
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The size_t type is defined through typedef as described in <stddef.h>.
The <ndbm.h> header defines the DBM type through typedef.
The following constants are defined as possible values for the store_mode argument to dbm_store():
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DBM_INSERT
- Insertion of new entries only.
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DBM_REPLACE
- Allow replacing existing entries.
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