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module;
#include <asio.hpp>
#include <csignal>
#include <format>
#include <system_error>
export module ttwhy.terminal:signal_handling;
namespace ttwhy::terminal
{
//! Asynchronously handle POSIX process and job-control signals for a terminal application.
//!
//! Intercepts SIGINT and SIGTERM to print an exit notification and terminate gracefully.
//! Intercepts SIGTSTP to restore terminal canonical and echo flags before raising SIGSTOP,
//! and intercepts SIGCONT to restore the terminal attributes when execution resumes.
//!
//! @tparam Stream The output stream type used for writing diagnostic messages.
//! @tparam TerminalAttributes The terminal attributes manager type.
//! @param stream The stream to write diagnostic messages to.
//! @param attributes The scoped attributes managing terminal canonical mode and echo.
//! @return An awaitable task that yields an error code upon termination.
export template<typename Stream, typename TerminalAttributes>
auto handle_signals(Stream & stream, TerminalAttributes & attributes) -> asio::awaitable<std::error_code>
{
auto executor = co_await asio::this_coro::executor;
auto signals = asio::signal_set{executor, SIGINT, SIGTERM};
signals.add(SIGTSTP);
signals.add(SIGCONT);
while (true)
{
auto [error, signal] = co_await signals.async_wait(asio::as_tuple(asio::use_awaitable));
if (error)
{
co_return error;
}
switch (signal)
{
case SIGINT:
case SIGTERM:
{
auto message = std::format("Received signal {}, exiting ...\n", signal);
co_await asio::async_write(stream, asio::buffer(message), asio::use_awaitable);
co_return asio::error_code{};
}
case SIGTSTP:
{
attributes.suspend();
attributes.canonical_mode(true).echo(true);
::raise(SIGSTOP);
break;
}
case SIGCONT:
{
attributes.resume();
break;
}
}
}
}
} // namespace ttwhy::terminal
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