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Berkeley DB Reference Guide:
  Programmer Notes

# Run-time configuration

There are a few interfaces that support run-time configuration of Berkeley DB by allowing applications to intercept Berkeley DB calls to underlying library or system call functionality:

>     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
>     db_env_set_func_yield

These interfaces are available only from the Berkeley DB C language API.

A not-uncommon problem for applications is the new API in Solaris 2.6 for manipulating large files. Because this API was not part of Solaris 2.5, it is difficult to create a single binary that takes advantage of the large file functionality in Solaris 2.6, but still runs on Solaris 2.5. Example code that supports this is included in the Berkeley DB distribution.

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