Re: [Cppcms-users] Advice on debugging file upload

[Artyom B. <art...@ya...>]

Yes...

It uses __builtin_return_address and __builtin_frame_address
and they are not really safe functions

 
   http://gcc.gnu.org/onlinedocs/gcc/Return-Address.html

So for this reason I really prefer to not use libexecinfo
under FreeBSD.

Other implementations (like GNU Libc for example) use
an information about the stack bottom to prevent
running out of the stack frame and creating access
violation.

So unless it would be proven otherwise libexecinfo is not
in use under FreeBSD.


Artyom Beilis
--------------
CppCMS - C++ Web Framework:   http://cppcms.com/
CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/



----- Original Message -----
> From: "ele...@ex..." <ele...@ex...>
> To: Artyom Beilis <art...@ya...>; cpp...@li...
> Cc: 
> Sent: Monday, April 23, 2012 3:59 PM
> Subject: Re: [Cppcms-users] Advice on debugging file upload
> 
> Are you referring to this library?
> 
> http://www.freebsd.org/cgi/url.cgi?ports/devel/libexecinfo/pkg-descr
> 
>>  Unfortunately FreeBSD does not provide such API, so it is not possible
>>  to create safe backtrace - the existing execinfo.h library that
>>  comes with FreeBSD is not safe when using with 
> "omit-frame-pointer"
>>  optimization.
>> 
>>  If you find any other suitable way to create a backtrace (at least
>>  backtrace - not backtrace_symbols)
>>  it would be possible to provide stack tracing for FreeBSD as well.
> 
> 
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