mirror of
https://github.com/baketnk/frame-yap.git
synced 2026-10-06 08:00:05 +02:00
74 lines
2.8 KiB
C++
74 lines
2.8 KiB
C++
#include "laser_setting.hpp"
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#include "mount.hpp"
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#include <atomic>
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#include <cerrno>
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#include <fstream>
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#include <string>
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#include <string_view>
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#include <fcntl.h>
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#include <unistd.h>
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namespace frameyap {
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namespace {
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std::atomic<unsigned long> next_temp{0};
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}
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std::filesystem::path default_laser_settings_path() {
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auto mount_path = default_mount_settings_path();
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return mount_path.empty() ? mount_path : mount_path.parent_path() / "lasers-anytime";
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}
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bool load_lasers_anytime(const std::filesystem::path& path) {
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try {
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if (path.empty() || std::filesystem::is_symlink(path) || !std::filesystem::is_regular_file(path)) return false;
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std::ifstream input(path, std::ios::binary);
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if (!input) return false;
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char data[9]{};
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input.read(data, sizeof(data));
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const auto size = input.gcount();
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return size == 3 && std::string_view(data, 3) == "on\n";
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} catch (...) { return false; }
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}
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bool save_lasers_anytime(const std::filesystem::path& path, bool enabled) {
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std::filesystem::path temporary;
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int fd = -1;
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try {
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if (path.empty() || path.filename().empty() || std::filesystem::is_symlink(path)) return false;
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const auto dir = path.has_parent_path() ? path.parent_path() : std::filesystem::path(".");
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std::error_code ec;
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std::filesystem::create_directories(dir, ec);
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if (ec) return false;
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for (int attempt = 0; attempt < 16; ++attempt) {
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temporary = dir / (path.filename().string() + ".tmp." + std::to_string(::getpid()) +
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"." + std::to_string(next_temp.fetch_add(1)));
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fd = ::open(temporary.c_str(), O_WRONLY | O_CREAT | O_EXCL | O_CLOEXEC, 0600);
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if (fd >= 0) break;
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if (errno != EEXIST) return false;
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}
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if (fd < 0) return false;
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const std::string_view content = enabled ? "on\n" : "off\n";
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size_t written = 0;
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while (written < content.size()) {
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const auto n = ::write(fd, content.data() + written, content.size() - written);
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if (n < 0 && errno == EINTR) continue;
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if (n <= 0) { ::close(fd); fd = -1; std::filesystem::remove(temporary, ec); return false; }
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written += static_cast<size_t>(n);
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}
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const bool synced = ::fsync(fd) == 0;
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const bool closed = ::close(fd) == 0;
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fd = -1;
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if (!synced || !closed) { std::filesystem::remove(temporary, ec); return false; }
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std::filesystem::rename(temporary, path, ec);
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if (ec) { std::filesystem::remove(temporary, ec); return false; }
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return true;
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} catch (...) {
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if (fd >= 0) ::close(fd);
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if (!temporary.empty()) { std::error_code ec; std::filesystem::remove(temporary, ec); }
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return false;
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}
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}
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} // namespace frameyap
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