vmarkovtsev/ DeathHandler
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Description
SIGSEGV handler which prints the debug stack trace for C/C++ projects on Linux. It is configurable and rather robust.
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DeathHandler class installs SEGFAULT, SIGABRT and SIGFPE signal handlers to print a nice stack trace and (if requested) generate a core dump. In DeathHandler's constructor, signal handlers are installed through
sigaction(). If your program encounters a segmentation fault, the call stack is unwinded with
backtrace(), converted into function names with line numbers via
addr2line(
fork()+
execlp()). Addresses from shared libraries are also converted thanks to dladdr(). All C++ symbols are demangled. Printed stack trace includes the faulty thread id obtained with
pthread_self()and each line contains the process id to distinguish several stack traces printed by different processes at the same time.
The code works primarily on Linux and tested on x86_64 and ARM with glibc. Besides, there is a partial support of MacOSX (addr2line -> atos is not implemented).
Since
backtrace()uses
malloc()and the heap my be corrupted by the time it is called,
malloc()and
free()have to be overridden. On Linux, it is done via a simple symbol overload; on MacOSX,
malloc_default_zone()approach is taken because overloading does not work out of the box.
Example
test.cc: ~~~~{.cc}
include "death_handler.h"
int main() { Debug::DeathHandler dh; int* p = NULL; *p = 0; return 0; } ~~~~
g++ -g death_handler.cc test.cc -ldl -o test ./test
This project is released under the Simplified BSD License. Copyright 2012 Samsung R&D Institute Russia, 2016 Moscow Institute of Physics and Technology.