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SubjectRe: Linux kernel modules development in C++
On Wed, Sep 27, 2000 at 04:14:39PM -0500, Timur Tabi wrote:
>
> I don't think any OS supports exception handling in a driver. It
> wouldn't make much sense, since there's no way for a driver to really
> "exit" (which is the ultimate destination of the exception).
>
> By the way, new and delete are NOT exceptions. They are simply
> wrappers for malloc() and free(). Just define your own malloc and free
> (they can be wrappers for a kernel memory allocation API, or you can
> write your own heap manager), and new and delete work just fine.

new and delete used to be just constructor/destructor-calling wrappers,
before exception handling went into the language. Now new is supposed
to throw a bad_alloc exception instead of returning NULL. If you have
an operator new like this:

void *operator new(size_t) { return NULL; }

then g++ will complain about it even with '-fno-exceptions'. You can use
new and delete in code without exception handling, I'm just explaining
why people would expect it to be an issue.

Periodically someone posts a minimal C++ runtime to LKML. A much larger
problem than the runtime is the fact that C++ is not the language of
choice of other kernel developers, making them reluctant to deal with
(and hence, to incorporate) your driver.

miket

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