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Merge branch 'stacktrace_on_crash' into hotfix_udp_crash

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Gioacchino Mazzurco 2018-11-05 00:20:33 +01:00
commit 1ef9876610
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GPG Key ID: A1FBCA3872E87051
3 changed files with 104 additions and 17 deletions
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113
libretroshare/src/util/stacktrace.h
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@ -1,9 +1,7 @@
/*******************************************************************************
* libretroshare/src/util: smallobject.h *
* libretroshare *
* *
* libretroshare: retroshare core library *
* *
* Copyright (C) 2016 Gioacchino Mazzurco <gio@eigenlab.org> *
* Copyright (C) 2016-2018 Gioacchino Mazzurco <gio@eigenlab.org> *
* Copyright (C) 2008 Timo Bingmann http://idlebox.net/ *
* *
* This program is free software: you can redistribute it and/or modify *
@ -20,10 +18,10 @@
* along with this program. If not, see <https://www.gnu.org/licenses/>. *
* *
*******************************************************************************/
#ifndef _STACKTRACE_H_
#define _STACKTRACE_H_
#pragma once
#include <stdio.h>
#include <csignal>
#if defined(__linux__) && defined(__GLIBC__)
@ -31,13 +29,28 @@
#include <execinfo.h>
#include <cxxabi.h>
/** Print a demangled stack backtrace of the caller function to FILE* out. */
static inline void print_stacktrace(FILE *out = stderr, unsigned int max_frames = 63)
/**
* @brief Print a backtrace to FILE* out.
* @param[in] demangle true to demangle C++ symbols requires malloc working, in
* some patological cases like a SIGSEGV received during a malloc this would
* cause deadlock so pass false if you may be in such situation (like in a
* SIGSEGV handler )
* @param[in] out output file
* @param[in] maxFrames maximum number of stack frames you want to bu printed
*/
static inline void print_stacktrace(
bool demangle = true, FILE *out = stderr, unsigned int maxFrames = 63 )
{
if(!out)
{
fprintf(stderr, "print_stacktrace invalid output file!\n");
return;
}
fprintf(out, "stack trace:\n");
// storage array for stack trace address data
void* addrlist[max_frames+1];
void* addrlist[maxFrames+1];
// retrieve current stack addresses
int addrlen = backtrace(addrlist, sizeof(addrlist) / sizeof(void*));
@ -48,6 +61,19 @@ static inline void print_stacktrace(FILE *out = stderr, unsigned int max_frames
return;
}
if(!demangle)
{
int outFd = fileno(out);
if(outFd < 0)
{
fprintf(stderr, "print_stacktrace invalid output file descriptor!\n");
return;
}
backtrace_symbols_fd(addrlist, addrlen, outFd);
return;
}
// resolve addresses into strings containing "filename(function+address)",
// this array must be free()-ed
char** symbollist = backtrace_symbols(addrlist, addrlen);
@ -62,8 +88,8 @@ static inline void print_stacktrace(FILE *out = stderr, unsigned int max_frames
{
char *begin_name = 0, *begin_offset = 0, *end_offset = 0;
// find parentheses and +address offset surrounding the mangled name:
// ./module(function+0x15c) [0x8048a6d]
/* find parentheses and +address offset surrounding the mangled
* name: ./module(function+0x15c) [0x8048a6d] */
for (char *p = symbollist[i]; *p; ++p)
{
if (*p == '(') begin_name = p;
@ -75,7 +101,8 @@ static inline void print_stacktrace(FILE *out = stderr, unsigned int max_frames
}
}
if (begin_name && begin_offset && end_offset && begin_name < begin_offset)
if ( begin_name && begin_offset && end_offset
&& begin_name < begin_offset )
{
*begin_name++ = '\0';
*begin_offset++ = '\0';
@ -86,17 +113,20 @@ static inline void print_stacktrace(FILE *out = stderr, unsigned int max_frames
// __cxa_demangle():
int status;
char* ret = abi::__cxa_demangle(begin_name, funcname, &funcnamesize, &status);
char* ret = abi::__cxa_demangle(
begin_name, funcname, &funcnamesize, &status );
if (status == 0)
{
funcname = ret; // use possibly realloc()-ed string
fprintf(out, " %s : %s+%s\n", symbollist[i], funcname, begin_offset);
fprintf( out, " %s : %s+%s\n",
symbollist[i], funcname, begin_offset );
}
else
{
// demangling failed. Output function name as a C function with
// no arguments.
fprintf(out, " %s : %s()+%s\n", symbollist[i], begin_name, begin_offset);
fprintf( out, " %s : %s()+%s\n",
symbollist[i], begin_name, begin_offset );
}
}
else
@ -111,12 +141,61 @@ static inline void print_stacktrace(FILE *out = stderr, unsigned int max_frames
}
#else // defined(__linux__) && defined(__GLIBC__)
static inline void print_stacktrace(FILE *out = stderr, unsigned int max_frames = 63)
static inline void print_stacktrace(
bool demangle = true, FILE *out = stderr, unsigned int max_frames = 63 )
{
(void) demangle;
(void) max_frames;
fprintf(out, "TODO: 2016/01/01 print_stacktrace not implemented yet for WINDOWS_SYS and ANDROID\n");
}
#endif // defined(__linux__) && defined(__GLIBC__)
#endif // _STACKTRACE_H_
/**
* @brief CrashStackTrace catch crash signals and print stack trace
* Inspired too https://oroboro.com/stack-trace-on-crash/
*/
struct CrashStackTrace
{
CrashStackTrace()
{
signal(SIGABRT, &CrashStackTrace::abortHandler);
signal(SIGSEGV, &CrashStackTrace::abortHandler);
signal(SIGILL, &CrashStackTrace::abortHandler);
signal(SIGFPE, &CrashStackTrace::abortHandler);
#ifdef SIGBUS
signal(SIGBUS, &CrashStackTrace::abortHandler);
#endif
}
static void abortHandler(int signum)
{
// associate each signal with a signal name string.
const char* name = nullptr;
switch(signum)
{
case SIGABRT: name = "SIGABRT"; break;
case SIGSEGV: name = "SIGSEGV"; break;
case SIGILL: name = "SIGILL"; break;
case SIGFPE: name = "SIGFPE"; break;
#ifdef SIGBUS
case SIGBUS: name = "SIGBUS"; break;
#endif
}
/** Notify the user which signal was caught. We use printf, because this
* is the most basic output function. Once you get a crash, it is
* possible that more complex output systems like streams and the like
* may be corrupted. So we make the most basic call possible to the
* lowest level, most standard print function. */
if(name)
fprintf(stderr, "Caught signal %d (%s)\n", signum, name);
else
fprintf(stderr, "Caught signal %d\n", signum);
print_stacktrace(false);
exit(-signum);
}
};

4
retroshare-gui/src/main.cpp
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@ -19,6 +19,10 @@
* Boston, MA 02110-1301, USA.
****************************************************************/
#include "util/stacktrace.h"
CrashStackTrace gCrashStackTrace;
#include <QObject>
#include <QMessageBox>
#include <QSplashScreen>

4
retroshare-service/src/retroshare-service.cc
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@ -16,6 +16,10 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "util/stacktrace.h"
CrashStackTrace gCrashStackTrace;
#include <QCoreApplication>
#include <csignal>
#include <QObject>