Message-ID: <425390E3.6060408@prim-time.fr>
From: Xavier Garreau <x.garreau@prim-time.fr>
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To: bluez-users@lists.sourceforge.net
Subject: Re: [Bluez-users] malloc & free
References: <424C259C.9000201@futurlink.com> <1112554711.8263.13.camel@pegasus> <42538BC5.7060106@futurlink.com>
In-Reply-To: <42538BC5.7060106@futurlink.com>
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Date: Wed, 06 Apr 2005 09:33:55 +0200

>>>The problem with these functions is that they call malloc(), expecting 
>>>the caller to call free(). The problem with that is that this approach 
>>>is not save, as it is not guaranteed that calling malloc() in a library 
>>>function and free() in the main program works. In fact, I have seen a 
>>>segmentation fault doing that.
>>>    
>>>
>>
>>explain why this is not safe.
>>  
>>
> I am not an expert in these issues, but I have read many times that 
> there is no guarantee that the malloc/free implementation is the same in 
> the main program and in the libraries. This is due to how the different 
> modules are compiled: compiler version, compile flags, etc. But, as I 
> said, I am not 100% sure. I am quite sure that I have read this for 
> Windows, but maybe (probably) Linux is different.

Except if statically linked with the libc or if malloc and free have 
been re_#define_d, functions from the lib and the main program will uses 
the system default libc implementation.

Regards,
Xavier Garreau


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