// Copyright 2015 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef LIBBRILLO_BRILLO_ASYNCHRONOUS_SIGNAL_HANDLER_INTERFACE_H_
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#define LIBBRILLO_BRILLO_ASYNCHRONOUS_SIGNAL_HANDLER_INTERFACE_H_
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#include <sys/signalfd.h>
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#include <base/callback.h>
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#include <brillo/brillo_export.h>
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namespace brillo {
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// Sets up signal handlers for registered signals, and converts signal receipt
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// into a write on a pipe. Watches that pipe for data and, when some appears,
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// execute the associated callback.
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class BRILLO_EXPORT AsynchronousSignalHandlerInterface {
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public:
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virtual ~AsynchronousSignalHandlerInterface() = default;
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// The callback called when a signal is received.
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using SignalHandler = base::Callback<bool(const struct signalfd_siginfo&)>;
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// Register a new handler for the given |signal|, replacing any previously
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// registered handler. |callback| will be called on the thread the
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// |AsynchronousSignalHandlerInterface| implementation is bound to when a
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// signal is received. The received |signalfd_siginfo| will be passed to
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// |callback|. |callback| must returns |true| if the signal handler must be
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// unregistered, and |false| otherwise. Due to an implementation detail, you
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// cannot set any sigaction flags you might be accustomed to using. This might
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// matter if you hoped to use SA_NOCLDSTOP to avoid getting a SIGCHLD when a
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// child process receives a SIGSTOP.
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virtual void RegisterHandler(int signal, const SignalHandler& callback) = 0;
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// Unregister a previously registered handler for the given |signal|.
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virtual void UnregisterHandler(int signal) = 0;
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};
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} // namespace brillo
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#endif // LIBBRILLO_BRILLO_ASYNCHRONOUS_SIGNAL_HANDLER_INTERFACE_H_
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