pub unsafe extern "C" fn switch_dso_func_sym(
lib: switch_dso_lib_t,
sym: *const c_char,
err: *mut *mut c_char,
) -> switch_dso_func_tpub unsafe extern "C" fn switch_dso_func_sym(
lib: switch_dso_lib_t,
sym: *const c_char,
err: *mut *mut c_char,
) -> switch_dso_func_t