# DBENV->set_func_exists |

`

###

    #include <db.h>

    int
    DBENV->set_func_exists(DB_ENV *dbenv,
        int (*func_exists)(const char *path, int *isdirp));

# Description

The Berkeley DB library requires the ability to determine if a file exists, and optionally, if 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 DBENV->set_func_exists interface affects the entire application, not only the environment in which it is called.

The DBENV->set_func_exists interface may only be used to configure Berkeley DB before the DBENV->open interface is called.

The DBENV->set_func_exists function returns a non-zero error value on failure and 0 on success.

# Errors

EINVAL
  An invalid flag value or parameter was specified.

  Called after DBENV->open was called.

# See Also

DBENV->set_func_close, DBENV->set_func_dirfree, DBENV->set_func_dirlist, DBENV->set_func_exists, DBENV->set_func_free, DBENV->set_func_fsync, DBENV->set_func_ioinfo, DBENV->set_func_malloc, DBENV->set_func_map, DBENV->set_func_open, DBENV->set_func_read, DBENV->set_func_realloc, DBENV->set_func_seek, DBENV->set_func_sleep, DBENV->set_func_unlink, DBENV->set_func_unmap, DBENV->set_func_write and DBENV->set_func_yield.`

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