[m-users.] Checking io.error programmatically

[Charles Shuller]

Hello,

Is there a way to check io.error programmatically?

I see a number of functions which return it, but it's type definition isn't
published and the docs just say:  Use io.error_message to decode it.

This returns a, presumably localized, string for an end user.

My specific use case is to test if a file exists at all, and take different
action based on it's existence.   I can manage that with io.call_system,
but this isn't exactly portable, and seems a bit messy.


Thanks!

Charles
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