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// signal_handlers.cpp
/**
* Copyright (C) 2010 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "pch.h"
#include <cstdarg>
#include <cstdio>
#include <cstdlib>
#if !defined(_WIN32) // TODO: windows support
#include <unistd.h>
#endif
#if !defined(_WIN32) && !defined(NOEXECINFO)
#include <execinfo.h>
#endif
#include "log.h"
#include "signal_handlers.h"
namespace mongo {
/*
* WARNING: PLEASE READ BEFORE CHANGING THIS MODULE
*
* All code in this module should be singal-friendly. Before adding any system
* call or other dependency, please make sure the latter still holds.
*
*/
static int rawWrite( int fd , char* c , int size ){
#if !defined(_WIN32)
int toWrite = size;
int writePos = 0;
int wrote;
while ( toWrite > 0 ){
wrote = write( fd , &c[writePos] , toWrite );
if ( wrote < 1 ) break;
toWrite -= wrote;
writePos += wrote;
}
return writePos;
#else
return -1;
#endif
}
static int formattedWrite( int fd , const char* format, ... ){
const int MAX_ENTRY = 256;
static char entryBuf[MAX_ENTRY];
va_list ap;
va_start( ap , format );
int entrySize = vsnprintf( entryBuf , MAX_ENTRY-1 , format , ap );
if ( entrySize < 0 ){
return -1;
}
if ( rawWrite( fd , entryBuf , entrySize ) < 0 ){
return -1;
}
return 0;
}
static void formattedBacktrace( int fd ){
#if !defined(_WIN32) && !defined(NOEXECINFO)
int numFrames;
const int MAX_DEPTH = 20;
void* stackFrames[MAX_DEPTH];
numFrames = backtrace( stackFrames , 20 );
for ( int i = 0; i < numFrames; i++ ){
formattedWrite( fd , "%p " , stackFrames[i] );
}
formattedWrite( fd , "\n" );
backtrace_symbols_fd( stackFrames , numFrames , fd );
#else
formattedWrite( fd, "backtracing not implemented for this platform yet\n" );
#endif
}
void printStackAndExit( int signalNum ){
int fd = Logstream::getLogDesc();
if ( fd >= 0 ){
formattedWrite( fd , "Received signal %d\n" , signalNum );
formattedWrite( fd , "Backtrace: " );
formattedBacktrace( fd );
formattedWrite( fd , "===\n" );
}
::exit( EXIT_ABRUPT );
}
} // namespace mongo
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