[/
/ Copyright (c) 2003-2025 Christopher M. Kohlhoff (chris at kohlhoff dot com)
/
/ Distributed under the Boost Software License, Version 1.0. (See accompanying
/ file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
/]
[section:signals Signal Handling]
Asio supports signal handling using a class called [link
asio.reference.signal_set signal_set]. Programs may add one or more signals to
the set, and then perform an `async_wait()` operation. The specified handler
will be called when one of the signals occurs. The same signal number may be
registered with multiple [link asio.reference.signal_set signal_set] objects,
however the signal number must be used only with Asio.
void handler(
const asio::error_code& error,
int signal_number)
{
if (!error)
{
// A signal occurred.
}
}
...
// Construct a signal set registered for process termination.
asio::signal_set signals(io_context, SIGINT, SIGTERM);
// Start an asynchronous wait for one of the signals to occur.
signals.async_wait(handler);
Signal handling also works on Windows, as the Microsoft Visual C++ runtime
library maps console events like Ctrl+C to the equivalent signal.
[heading See Also]
[link asio.reference.signal_set signal_set],
[link asio.examples.cpp11_examples.http_server HTTP server example (C++11)].
[endsect]
