Function ceph_rust::rados_read_op_exec

pub unsafe extern fn rados_read_op_exec(read_op: rados_read_op_t, cls: *const c_char, method: *const c_char, in_buf: *const c_char, in_len: size_t, out_buf: *mut *mut c_char, out_len: *mut size_t, prval: *mut c_int)