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 <cerrno>
22 #include <cstddef>
23 #include <functional>
24 #include <utility>
25 #include <vector>
26
27 #include <absl/log/log.h>
28 #include <absl/status/status.h>
29
30 namespace cuttlefish::process_sandboxer {
31
Add(int fd,std::function<absl::Status (short)> cb)32 void PollCallback::Add(int fd, std::function<absl::Status(short)> cb) {
33 pollfds_.emplace_back(pollfd{
34 .fd = fd,
35 .events = POLLIN,
36 });
37 callbacks_.emplace_back(std::move(cb));
38 }
39
Poll()40 absl::Status PollCallback::Poll() {
41 int poll_ret = poll(pollfds_.data(), pollfds_.size(), 0);
42 if (poll_ret < 0) {
43 return absl::Status(absl::ErrnoToStatusCode(errno), "`poll` failed");
44 }
45
46 VLOG(2) << "`poll` returned " << poll_ret;
47
48 for (size_t i = 0; i < pollfds_.size() && i < callbacks_.size(); i++) {
49 const auto& poll_fd = pollfds_[i];
50 if (poll_fd.revents == 0) {
51 continue;
52 }
53 auto status = callbacks_[i](poll_fd.revents);
54 if (!status.ok()) {
55 return status;
56 }
57 }
58 return absl::OkStatus();
59 }
60
61 } // namespace cuttlefish::process_sandboxer
62