mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-20 08:40:50 +00:00
b79ead9c84
* Replicate poco into base/poco/ * De-register poco submodule * Build poco from ClickHouse * Exclude poco from stylecheck * Exclude poco from whitespace check * Exclude poco from typo check * Remove x bit from sources/headers (the style check complained) * Exclude poco from duplicate include check * Fix fasttest * Remove contrib/poco-cmake/* * Simplify poco build descriptions * Remove poco stuff not used by ClickHouse * Glob poco sources * Exclude poco from clang-tidy
130 lines
3.2 KiB
C++
130 lines
3.2 KiB
C++
//
|
|
// SignalHandler.h
|
|
//
|
|
// Library: Foundation
|
|
// Package: Threading
|
|
// Module: SignalHandler
|
|
//
|
|
// Definition of the SignalHandler class.
|
|
//
|
|
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
|
|
// and Contributors.
|
|
//
|
|
// SPDX-License-Identifier: BSL-1.0
|
|
//
|
|
|
|
|
|
#ifndef Foundation_SignalHandler_INCLUDED
|
|
#define Foundation_SignalHandler_INCLUDED
|
|
|
|
|
|
#include "Poco/Foundation.h"
|
|
|
|
|
|
#if defined(POCO_OS_FAMILY_UNIX) && !defined(POCO_VXWORKS)
|
|
|
|
|
|
#include <vector>
|
|
#include <setjmp.h>
|
|
|
|
|
|
namespace Poco {
|
|
|
|
|
|
class Foundation_API SignalHandler
|
|
/// This helper class simplifies the handling of POSIX signals.
|
|
///
|
|
/// The class provides a signal handler (installed with
|
|
/// installHandlers()) that translates certain POSIX
|
|
/// signals (SIGILL, SIGBUS, SIGSEGV, SIGSYS) into
|
|
/// C++ exceptions.
|
|
///
|
|
/// Internally, a stack of sigjmp_buf structs is maintained for
|
|
/// each thread. The constructor pushes a new sigjmp_buf onto
|
|
/// the current thread's stack. The destructor pops the sigjmp_buf
|
|
/// from the stack.
|
|
///
|
|
/// The poco_throw_on_signal macro creates an instance of SignalHandler
|
|
/// on the stack, which results in a new sigjmp_buf being created.
|
|
/// The sigjmp_buf is then set-up with sigsetjmp().
|
|
///
|
|
/// The handleSignal() method, which is invoked when a signal arrives,
|
|
/// checks if a sigjmp_buf is available for the current thread.
|
|
/// If so, siglongjmp() is used to jump out of the signal handler.
|
|
///
|
|
/// Typical usage is as follows:
|
|
///
|
|
/// try
|
|
/// {
|
|
/// poco_throw_on_signal;
|
|
/// ...
|
|
/// }
|
|
/// catch (Poco::SignalException&)
|
|
/// {
|
|
/// ...
|
|
/// }
|
|
///
|
|
/// The best way to deal with a SignalException is to log as much context
|
|
/// information as possible, to aid in debugging, and then to exit.
|
|
///
|
|
/// The SignalHandler can be disabled globally by compiling POCO and client
|
|
/// code with the POCO_NO_SIGNAL_HANDLER macro defined.
|
|
{
|
|
public:
|
|
SignalHandler();
|
|
/// Creates the SignalHandler.
|
|
|
|
~SignalHandler();
|
|
/// Destroys the SignalHandler.
|
|
|
|
sigjmp_buf& jumpBuffer();
|
|
/// Returns the top-most sigjmp_buf for the current thread.
|
|
|
|
static void throwSignalException(int sig);
|
|
/// Throws a SignalException with a textual description
|
|
/// of the given signal as argument.
|
|
|
|
static void install();
|
|
/// Installs signal handlers for SIGILL, SIGBUS, SIGSEGV
|
|
/// and SIGSYS.
|
|
|
|
protected:
|
|
static void handleSignal(int sig);
|
|
/// The actual signal handler.
|
|
|
|
struct JumpBuffer
|
|
/// sigjmp_buf cannot be used to instantiate a std::vector,
|
|
/// so we provide a wrapper struct.
|
|
{
|
|
sigjmp_buf buf;
|
|
};
|
|
typedef std::vector<JumpBuffer> JumpBufferVec;
|
|
|
|
static JumpBufferVec& jumpBufferVec();
|
|
/// Returns the JumpBufferVec for the current thread.
|
|
|
|
private:
|
|
static JumpBufferVec _jumpBufferVec;
|
|
|
|
friend class ThreadImpl;
|
|
};
|
|
|
|
|
|
#ifndef POCO_NO_SIGNAL_HANDLER
|
|
#define poco_throw_on_signal \
|
|
Poco::SignalHandler _poco_signalHandler; \
|
|
int _poco_signal = sigsetjmp(_poco_signalHandler.jumpBuffer(), 1); \
|
|
if (_poco_signal) _poco_signalHandler.throwSignalException(_poco_signal);
|
|
#else
|
|
#define poco_throw_on_signal
|
|
#endif
|
|
|
|
|
|
} // namespace Poco
|
|
|
|
|
|
#endif // POCO_OS_FAMILY_UNIX
|
|
|
|
|
|
#endif // Foundation_SignalHandler_INCLUDED
|