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132 lines
3.3 KiB
C++
132 lines
3.3 KiB
C++
//
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// SignalHandler.h
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//
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// Library: Foundation
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// Package: Threading
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// Module: SignalHandler
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//
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// Definition of the SignalHandler class.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_SignalHandler_INCLUDED
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#define Foundation_SignalHandler_INCLUDED
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#include "Poco/Foundation.h"
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#if defined(POCO_OS_FAMILY_UNIX) && !defined(POCO_VXWORKS)
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# include <vector>
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# include <setjmp.h>
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namespace Poco
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{
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class Foundation_API SignalHandler
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/// This helper class simplifies the handling of POSIX signals.
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///
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/// The class provides a signal handler (installed with
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/// installHandlers()) that translates certain POSIX
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/// signals (SIGILL, SIGBUS, SIGSEGV, SIGSYS) into
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/// C++ exceptions.
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///
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/// Internally, a stack of sigjmp_buf structs is maintained for
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/// each thread. The constructor pushes a new sigjmp_buf onto
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/// the current thread's stack. The destructor pops the sigjmp_buf
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/// from the stack.
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///
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/// The poco_throw_on_signal macro creates an instance of SignalHandler
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/// on the stack, which results in a new sigjmp_buf being created.
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/// The sigjmp_buf is then set-up with sigsetjmp().
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///
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/// The handleSignal() method, which is invoked when a signal arrives,
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/// checks if a sigjmp_buf is available for the current thread.
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/// If so, siglongjmp() is used to jump out of the signal handler.
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///
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/// Typical usage is as follows:
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///
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/// try
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/// {
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/// poco_throw_on_signal;
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/// ...
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/// }
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/// catch (Poco::SignalException&)
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/// {
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/// ...
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/// }
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///
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/// The best way to deal with a SignalException is to log as much context
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/// information as possible, to aid in debugging, and then to exit.
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///
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/// The SignalHandler can be disabled globally by compiling POCO and client
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/// code with the POCO_NO_SIGNAL_HANDLER macro defined.
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{
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public:
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SignalHandler();
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/// Creates the SignalHandler.
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~SignalHandler();
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/// Destroys the SignalHandler.
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sigjmp_buf & jumpBuffer();
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/// Returns the top-most sigjmp_buf for the current thread.
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static void throwSignalException(int sig);
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/// Throws a SignalException with a textual description
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/// of the given signal as argument.
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static void install();
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/// Installs signal handlers for SIGILL, SIGBUS, SIGSEGV
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/// and SIGSYS.
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protected:
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static void handleSignal(int sig);
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/// The actual signal handler.
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struct JumpBuffer
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/// sigjmp_buf cannot be used to instantiate a std::vector,
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/// so we provide a wrapper struct.
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{
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sigjmp_buf buf;
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};
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typedef std::vector<JumpBuffer> JumpBufferVec;
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static JumpBufferVec & jumpBufferVec();
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/// Returns the JumpBufferVec for the current thread.
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private:
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static JumpBufferVec _jumpBufferVec;
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friend class ThreadImpl;
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};
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# ifndef POCO_NO_SIGNAL_HANDLER
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# define poco_throw_on_signal \
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Poco::SignalHandler _poco_signalHandler; \
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int _poco_signal = sigsetjmp(_poco_signalHandler.jumpBuffer(), 1); \
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if (_poco_signal) \
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_poco_signalHandler.throwSignalException(_poco_signal);
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# else
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# define poco_throw_on_signal
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# endif
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} // namespace Poco
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#endif // POCO_OS_FAMILY_UNIX
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#endif // Foundation_SignalHandler_INCLUDED
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