Function librados_sys::rados_exec

pub unsafe extern "C" fn rados_exec(
    io: rados_ioctx_t, 
    oid: *const c_char, 
    cls: *const c_char, 
    method: *const c_char, 
    in_buf: *const c_char, 
    in_len: size_t, 
    buf: *mut c_char, 
    out_len: size_t
) -> c_int