65 lines
2.1 KiB
C++
65 lines
2.1 KiB
C++
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/*
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* Copyright (C) 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <sys/inotify.h>
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#include <unistd.h>
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#include <string>
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#include <vector>
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#include <android-base/logging.h>
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namespace cuttlefish {
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#define INOTIFY_MAX_EVENT_SIZE (sizeof(struct inotify_event) + NAME_MAX + 1)
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std::vector<std::string> GetCreatedFileListFromInotifyFd(int fd) {
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char event_readout[INOTIFY_MAX_EVENT_SIZE];
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int bytes_parsed = 0;
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std::vector<std::string> result;
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// Each successful read can contain one or more of inotify_event events
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// Note: read() on inotify returns 'whole' events, will never partially
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// populate the buffer.
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int event_read_out_length = read(fd, event_readout, INOTIFY_MAX_EVENT_SIZE);
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if (event_read_out_length == -1) {
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LOG(ERROR) << __FUNCTION__
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<< ": Couldn't read out inotify event due to error: '"
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<< strerror(errno) << "' (" << errno << ")";
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return std::vector<std::string>();
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}
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while (bytes_parsed < event_read_out_length) {
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struct inotify_event* event =
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reinterpret_cast<inotify_event*>(event_readout + bytes_parsed);
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bytes_parsed += sizeof(struct inotify_event) + event->len;
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// No file name was present
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if (event->len == 0) {
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LOG(ERROR) << __FUNCTION__ << ": inotify event didn't contain filename";
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continue;
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}
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if (!(event->mask & IN_CREATE)) {
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LOG(ERROR) << __FUNCTION__
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<< ": inotify event didn't pertain to file creation";
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continue;
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}
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result.push_back(std::string(event->name));
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}
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return result;
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}
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} // namespace cuttlefish
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