152 lines
3.5 KiB
C++
152 lines
3.5 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/*
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* Copyright (c) 2010 NICTA
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation;
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author: Quincy Tse <quincy.tse@nicta.com.au>
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*/
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#include "fatal-impl.h"
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#include <iostream>
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#include <list>
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#include <cstdlib>
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#include <cstdio>
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#include <csignal>
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namespace ns3 {
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namespace FatalImpl {
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/**
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* Note on implementation: the singleton pattern we use here is tricky because
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* it has to deal with:
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* - make sure that whoever calls Register (potentially before main enters and
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* before any constructor run in this file) succeeds
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* - make sure that whoever calls Unregister (potentially before FlushStream runs
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* but also after it runs) succeeds
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* - make sure that the memory allocated with new is deallocated with delete before
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* the program exits so that valgrind reports no leaks
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*
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* This is why we go through all the painful hoops below.
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*/
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/* File-scope */
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namespace {
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std::list<std::ostream*> **PeekStreamList (void)
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{
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static std::list<std::ostream*> *streams = 0;
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return &streams;
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}
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std::list<std::ostream*> *GetStreamList (void)
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{
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std::list<std::ostream*> **pstreams = PeekStreamList ();
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if (*pstreams == 0)
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{
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*pstreams = new std::list<std::ostream*> ();
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}
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return *pstreams;
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}
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struct destructor
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{
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~destructor ()
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{
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std::list<std::ostream*> **pstreams = PeekStreamList ();
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delete *pstreams;
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*pstreams = 0;
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}
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};
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}
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void
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RegisterStream (std::ostream* stream)
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{
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GetStreamList ()->push_back (stream);
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}
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void
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UnregisterStream (std::ostream* stream)
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{
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std::list<std::ostream*> **pl = PeekStreamList ();
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if (*pl == 0)
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{
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return;
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}
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(*pl)->remove (stream);
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if ((*pl)->empty ())
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{
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delete *pl;
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*pl = 0;
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}
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}
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namespace {
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/* Overrides normal SIGSEGV handler once the
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* HandleTerminate function is run. */
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void sigHandler(int sig)
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{
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FlushStreams ();
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std::abort ();
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}
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}
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void
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FlushStreams (void)
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{
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std::list<std::ostream*> **pl = PeekStreamList ();
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if (pl == 0)
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{
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return;
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}
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/* Override default SIGSEGV handler - will flush subsequent
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* streams even if one of the stream pointers is bad.
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* The SIGSEGV override should only be active for the
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* duration of this function. */
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struct sigaction hdl;
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hdl.sa_handler=sigHandler;
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sigaction (SIGSEGV, &hdl, 0);
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std::list<std::ostream*> *l = *pl;
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/* Need to do it this way in case any of the ostream* causes SIGSEGV */
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while (!l->empty ())
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{
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std::ostream* s (l->front ());
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l->pop_front ();
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s->flush ();
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}
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/* Restore default SIGSEGV handler (Not that it matters anyway) */
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hdl.sa_handler=SIG_DFL;
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sigaction (SIGSEGV, &hdl, 0);
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/* Flush all opened FILE* */
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std::fflush (0);
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/* Flush stdandard streams - shouldn't be required (except for clog) */
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std::cout.flush ();
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std::cerr.flush ();
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std::clog.flush ();
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delete l;
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*pl = 0;
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}
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} //FatalImpl
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} //ns3
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