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@@ -1603,6 +1603,10 @@ unspecified.
The function returns a pointer to the @code{DBM} structure describing
the database. This pointer is used to refer to this database in all
operations described below.
+
+Any error detected will cause a return value of @samp{NULL} and an
+appropriate value will be stored in @code{gdbm_errno}
+(@pxref{Variables}).
@end deftypefn
@deftypefn {ndbm} void dbm_close (DBM *@var{dbf})

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