Berkeley DB

db_env_set_func_exists

						#include <db.h>
						int
						db_env_set_func_exists(int (*func_exists)(const char *path, int *isdirp));
					

Description

The Berkeley DB library requires the ability to determine whether a file exists, and optionally, whether it is a file of type directory. The func argument must conform to the following interface:

int exists(const char *path, int *isdirp); 

The path argument is the pathname of the file to be checked.

If the isdirp argument is non-NULL, it must be set to non-0 if path is a directory, and 0 if path is not a directory.

The func_exists function must return the value of errno on failure and 0 on success.

The db_env_set_func_exists interface affects the entire application, not a single database or database environment. ...