int (*func_dirlist)(const char *dir, char ***namesp, int *cntp));
The Berkeley DB library requires the ability to read through a directory and
create a list of files that the directory contains. The
func_dirlist argument must conform to the following interface:
int dirlist(const char *dir, char ***namesp, int *cntp);
The dir argument is the name of the directory to be searched.
The function must return a pointer to an array of nul-terminated file
names into the memory location to which the namesp argument
refers, and a count of the number of elements in the array into the
memory location to which cntp refers.
The func_dirlist interface must return the value of errno on
failure and 0 on success.
The db_env_set_func_dirlist method configures all operations performed by a process and
all of its threads of control, not operations confined to a single
Although the db_env_set_func_dirlist interface may be called at any time during the
life of the application, it should normally be called before making
calls to the db_env_create or db_create methods.
The db_env_set_func_dirlist method returns a non-zero error value on failure and 0 on success.
The db_env_set_func_dirlist method may fail and return a non-zero error for the following conditions:
- An invalid flag value or parameter was specified.
The db_env_set_func_dirlist method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions.
If a catastrophic error has occurred, the db_env_set_func_dirlist method may fail and
in which case all subsequent Berkeley DB calls will fail in the same way.
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