# db_env_set_func_dirfree

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    #include <db.h>

    int
    db_env_set_func_dirfree(void (*func_dirfree)(char **namesp, int cnt));

# Description

The Berkeley DB library requires the ability to return any memory allocated as part of the routine which reads through a directory and creates a list of files that the directory contains (see db_env_set_func_dirlist). The func_dirfree argument must conform to the following interface:

>     int dirfree(char **namesp, int cnt);

The namesp and cnt arguments are the same values as were returned by the db_env_set_func_dirlist function.

The func_dirfree interface must return the value of errno on failure and 0 on success.

The db_env_set_func_dirfree method 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_dirfree 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_dirfree method returns a non-zero error value on failure and 0 on success.

# Errors

The db_env_set_func_dirfree method may fail and return a non-zero error for the following conditions:

EINVAL
  An invalid flag value or parameter was specified.

The db_env_set_func_dirfree 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_dirfree method may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

# See Also

Run-time configuration`

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