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123 lines
3.0 KiB
C++
123 lines
3.0 KiB
C++
// signal_handlers.cpp
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/**
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* Copyright (C) 2010 10gen Inc.
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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 Affero General Public License, version 3,
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* as 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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "pch.h"
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#include <cstdarg>
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#include <cstdio>
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#include <cstdlib>
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#if !defined(_WIN32) // TODO: windows support
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#include <unistd.h>
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#endif
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#if !defined(_WIN32) && !defined(NOEXECINFO)
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#include <execinfo.h>
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#endif
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#include "log.h"
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#include "signal_handlers.h"
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namespace mongo {
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/*
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* WARNING: PLEASE READ BEFORE CHANGING THIS MODULE
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*
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* All code in this module should be singal-friendly. Before adding any system
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* call or other dependency, please make sure the latter still holds.
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*
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*/
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static int rawWrite( int fd , char* c , int size ) {
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#if !defined(_WIN32)
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int toWrite = size;
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int writePos = 0;
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int wrote;
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while ( toWrite > 0 ) {
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wrote = write( fd , &c[writePos] , toWrite );
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if ( wrote < 1 ) break;
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toWrite -= wrote;
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writePos += wrote;
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}
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return writePos;
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#else
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return -1;
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#endif
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}
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static int formattedWrite( int fd , const char* format, ... ) {
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const int MAX_ENTRY = 256;
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static char entryBuf[MAX_ENTRY];
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va_list ap;
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va_start( ap , format );
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int entrySize = vsnprintf( entryBuf , MAX_ENTRY-1 , format , ap );
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if ( entrySize < 0 ) {
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return -1;
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}
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if ( rawWrite( fd , entryBuf , entrySize ) < 0 ) {
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return -1;
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}
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return 0;
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}
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static void formattedBacktrace( int fd ) {
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#if !defined(_WIN32) && !defined(NOEXECINFO)
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int numFrames;
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const int MAX_DEPTH = 20;
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void* stackFrames[MAX_DEPTH];
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numFrames = backtrace( stackFrames , 20 );
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for ( int i = 0; i < numFrames; i++ ) {
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formattedWrite( fd , "%p " , stackFrames[i] );
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}
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formattedWrite( fd , "\n" );
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backtrace_symbols_fd( stackFrames , numFrames , fd );
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#else
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formattedWrite( fd, "backtracing not implemented for this platform yet\n" );
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#endif
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}
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void printStackAndExit( int signalNum ) {
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int fd = Logstream::getLogDesc();
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if ( fd >= 0 ) {
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formattedWrite( fd , "Received signal %d\n" , signalNum );
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formattedWrite( fd , "Backtrace: " );
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formattedBacktrace( fd );
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formattedWrite( fd , "===\n" );
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}
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::exit( EXIT_ABRUPT );
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}
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} // namespace mongo
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