Setting $! in xs

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Hi -

I am a bit confused about how to set $! from within an xs module. I have
searched perlxstut, perlxs, and perlguts without really understanding what
is involved. Can some one either point me to a module that sets $! or give
me a short description on how it is done?

Thanks!

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Re: Setting $! in xs

On 06/08/2011 10:15, Beau E. Cox wrote:
> Hi -
>
> I am a bit confused about how to set $! from within an xs module. I have
> searched perlxstut, perlxs, and perlguts without really understanding what
> is involved. Can some one either point me to a module that sets $! or give
> me a short description on how it is done?

I have never written XS code to do this, but since perldoc perlvar says

> If used numerically, yields the current value of the C "errno"
> variable, or in other words, if a system or library call fails,
> it sets this variable.

I imagine that assigning to errno in your C code would do the trick.
Whether that also propagates to the contents of %! I cannot say.

Rob


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