zircon/system/ulib/fs-host/file_size_recorder.cpp

// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <fs-host/file_size_recorder.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

FileSizeRecorder::FileSizeRecorder() = default;
FileSizeRecorder::~FileSizeRecorder() = default;

bool FileSizeRecorder::OpenSizeFile(const char* const path) {
    std::lock_guard<std::mutex> lock(sizes_file_lock_);
    if (sizes_file_)
        return false;
    sizes_file_.reset(open(path, O_CREAT|O_TRUNC|O_WRONLY, 0644));
    return bool{sizes_file_};
}

bool FileSizeRecorder::AppendSizeInformation(const char* const name, size_t size) {
    std::lock_guard<std::mutex> lock(sizes_file_lock_);

    if (!sizes_file_) {
        return true;
    }

    if (dprintf(sizes_file_.get(), "%s=%zu\n", name, size) < 0) {
        fprintf(stderr, "error: sizes file append error\n");
        return false;
    }
    return true;
}