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/*
* Copyright (C) 2023 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <limits.h>
#include <string.h>
#include <sys/inotify.h>
#include <unistd.h>
#include <string>
#include <vector>
#include <android-base/logging.h>
#include "inotify.h"
namespace cuttlefish {
std::vector<std::string> GetCreatedFileListFromInotifyFd(int fd) {
return GetFileListFromInotifyFd(fd, IN_CREATE);
}
#define INOTIFY_MAX_EVENT_SIZE (sizeof(struct inotify_event) + NAME_MAX + 1)
std::vector<std::string> GetFileListFromInotifyFd(int fd, uint32_t mask) {
char event_readout[INOTIFY_MAX_EVENT_SIZE];
int bytes_parsed = 0;
std::vector<std::string> result;
// Each successful read can contain one or more of inotify_event events
// Note: read() on inotify returns 'whole' events, will never partially
// populate the buffer.
int event_read_out_length = read(fd, event_readout, INOTIFY_MAX_EVENT_SIZE);
if (event_read_out_length == -1) {
LOG(ERROR) << __FUNCTION__
<< ": Couldn't read out inotify event due to error: '"
<< strerror(errno) << "' (" << errno << ")";
return std::vector<std::string>();
}
while (bytes_parsed < event_read_out_length) {
struct inotify_event* event =
reinterpret_cast<inotify_event*>(event_readout + bytes_parsed);
bytes_parsed += sizeof(struct inotify_event) + event->len;
// No file name was present
if (event->len == 0) {
LOG(ERROR) << __FUNCTION__ << ": inotify event didn't contain filename";
continue;
}
if (!(event->mask & mask)) {
LOG(ERROR) << __FUNCTION__
<< ": inotify event didn't pertain to the event";
continue;
}
result.push_back(std::string(event->name));
}
return result;
}
} // namespace cuttlefish
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