[Mono-list] Mono.Unix.Native.Syscall.readlink memory corruption

Andreas Färber andreas.faerber at web.de
Tue Mar 14 07:08:53 EST 2006

>> On a related note:  if a C function mallocs some memory and returns a
>> pointer
>> to that memory, does p/invoke free the memory once marshalling is
>> complete?
> No. There is simply no way to automatically determine whether it
> should be
> freed and there is even less chance to determine how (using what
> function)
> it should be freed.
> If you want to do so you have to use an IntPtr that you can free
> manually.
> Note that you can alternatively use a custom marshaler but you have to do
> the same with a more complex and probably more proper design.
This is not entirely true. A returned string is actually automatically
freed when marshalled as string (as opposed to IntPtr). In that case
Mono does not determine whether it should be freed, it simply frees it.


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