Function svn_wc_set_adm_dir 

pub unsafe extern "C" fn svn_wc_set_adm_dir(
    name: *const c_char,
    pool: *mut apr_pool_t,
) -> *mut svn_error_t

Use @a name for the administrative directory in the working copy. Use @a pool for any temporary allocations.

The list of valid names is limited. Currently only “.svn” (the default) and “_svn” are allowed.

@note This function changes global (per-process) state and must be called in a single-threaded context during the initialization of a Subversion client.

@since New in 1.3.