db_env_set_func_exists
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## db_env_set_func_exists

    #include <db.h>

    int
    db_env_set_func_exists(int (*func_exists)(const char *path,
                           int *isdirp));

The Berkeley DB library requires the ability to determine whether a file exists and whether it is a file of type directory.

The `db_env_set_func_exists()` function configures all operations performed by a process and all of its threads of control, not operations confined to a single database environment.

Although the `db_env_set_func_exists()` function 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_exists()` function returns a non-zero error value on failure and 0 on success.

### Parameters

#### func_exists

The func_exists parameter is the function which returns if a file exists and if it is a file of type directory.

The path parameter to this function is the pathname of the file to be checked.

If the isdirp parameter 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.

### See Also

Run-time configuration

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