# db_env_set_func_dirlist

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    #include <db.h>

    int
    db_env_set_func_dirlist(
        int (*func_dirlist)(const char *dir, char ***namesp, int *cntp));

# Description

The Berkeley DB library requires the ability to read through a directory and create a list of files that 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 in the memory location referenced by the argument namesp, and a count of the number of elements in the array in the memory location referenced by cntp.

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

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

While the db_env_set_func_dirlist interface may be used to configure Berkeley DB at any time during the life of the application, it should normally be called before making any calls to the db_env_create or db_create functions.

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

The db_env_set_func_dirlist function returns a non-zero error value on failure and 0 on success.

# Errors

EINVAL
  An invalid flag value or parameter was specified.

# See Also

db_env_set_func_close, db_env_set_func_dirfree, db_env_set_func_dirlist, db_env_set_func_exists, db_env_set_func_free, db_env_set_func_fsync, db_env_set_func_ioinfo, db_env_set_func_malloc, db_env_set_func_map, db_env_set_func_open, db_env_set_func_read, db_env_set_func_realloc, db_env_set_func_seek, db_env_set_func_sleep, db_env_set_func_unlink, db_env_set_func_unmap, db_env_set_func_write and db_env_set_func_yield.`

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