1 /*
2 * Copyright (C) 2024 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 #include "host/commands/process_sandboxer/poll_callback.h"
18
19 #include <poll.h>
20
21 #include <functional>
22 #include <vector>
23
24 #include <absl/log/log.h>
25 #include <absl/status/status.h>
26
27 namespace cuttlefish {
28 namespace process_sandboxer {
29
Add(int fd,std::function<absl::Status (short)> cb)30 void PollCallback::Add(int fd, std::function<absl::Status(short)> cb) {
31 pollfds_.emplace_back(pollfd{
32 .fd = fd,
33 .events = POLLIN,
34 });
35 callbacks_.emplace_back(std::move(cb));
36 }
37
Poll()38 absl::Status PollCallback::Poll() {
39 int poll_ret = poll(pollfds_.data(), pollfds_.size(), 0);
40 if (poll_ret < 0) {
41 return absl::Status(absl::ErrnoToStatusCode(errno), "`poll` failed");
42 }
43
44 VLOG(2) << "`poll` returned " << poll_ret;
45
46 for (size_t i = 0; i < pollfds_.size() && i < callbacks_.size(); i++) {
47 const auto& poll_fd = pollfds_[i];
48 if (poll_fd.revents == 0) {
49 continue;
50 }
51 auto status = callbacks_[i](poll_fd.revents);
52 if (!status.ok()) {
53 return status;
54 }
55 }
56 return absl::OkStatus();
57 }
58
59 } // namespace process_sandboxer
60 } // namespace cuttlefish
61