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// **********************************************************************
//
// Copyright (c) 2003 - 2004
// ZeroC, Inc.
// North Palm Beach, FL, USA
//
// All Rights Reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
#ifndef ICE_UTIL_CTRL_C_HANDLER_H
#define ICE_UTIL_CTRL_C_HANDLER_H
#include <IceUtil/Config.h>
#include <IceUtil/Exception.h>
namespace IceUtil
{
// The CtrlCHandler provides a portable way to handle CTRL+C and
// CTRL+C like signals
// On Unix/POSIX, the CtrlCHandler handles SIGHUP, SIGINT and SIGTERM.
// On Windows, it is essentially a wrapper for SetConsoleCtrlHandler().
//
// In a process, only one CtrlCHandler can exist at a given time:
// the CtrlCHandler constructor raises CtrlCHandlerException if
// you attempt to create a second CtrlCHandler.
// On Unix/POSIX, it is essential to create the CtrlCHandler before
// creating any thread, as the CtrlCHandler constructor masks
// SIGHUP, SIGINT and SIGTERM; by default, threads created later will
// inherit this signal mask.
//
// When a CTRL+C or CTRL+C like signal is sent to the process, the
// user-registered callback is called in a separate thread; it is
// given the signal number. The callback must not raise exceptions.
// On Unix/POSIX, the callback is NOT a signal handler and can call
// functions that are not async-signal safe.
//
// The CtrCHandler destructor "unregisters" the callback. However
// on Unix/POSIX it does not restore the old signal mask in any
// thread, so SIGHUP, SIGINT and SIGTERM are then ignored.
//
// TODO: Maybe the behavior on Windows should be the same? Now we
// just restore the default behavior (TerminateProcess).
typedef void (*CtrlCHandlerCallback)(int);
class ICE_UTIL_API CtrlCHandler
{
public:
CtrlCHandler(CtrlCHandlerCallback = 0);
~CtrlCHandler();
void setCallback(CtrlCHandlerCallback);
CtrlCHandlerCallback getCallback() const;
};
class ICE_UTIL_API CtrlCHandlerException : public Exception
{
public:
CtrlCHandlerException(const char*, int);
virtual const std::string& ice_name() const;
virtual Exception* ice_clone() const;
virtual void ice_throw() const;
};
}
#endif
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