1 /*
2 * Copyright (C) 2021 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #pragma once
18
19 #include <android-base/macros.h>
20
21 #include <functional>
22
23 namespace android::nlinterceptor {
24
25 /**
26 * Handy-dandy helper to get the size of a statically initialized array.
27 *
28 * \param N the array to get the size of.
29 * \return the size of the array.
30 */
31 template <typename T, size_t N>
countof(T (&)[N])32 size_t countof(T (&)[N]) {
33 return N;
34 }
35
36 /**
37 * Helper to check if socket is readable (POLLIN is set).
38 *
39 * \param revents pollfd.revents value to check.
40 * \return true if socket is ready to read.
41 */
42 bool isSocketReadable(short revents);
43
44 /**
45 * Helper to check if socket is bad (POLLERR, POLLHUP or POLLNVAL is set).
46 *
47 * \param revents pollfd.revents value to check.
48 * \return true if socket is bad.
49 */
50 bool isSocketBad(short revents);
51
52 } // namespace android::nlinterceptor
53