[TxMt] Re: [FIXED] Interactive Input on Snow Leopard.

[Luke Daley]

On 11/09/2009, at 12:52 PM, Adam R. Maxwell wrote:

>>> Also, for my own curiosity, is it a problem that your read override
>>> doesn't appear to be async-signal safe?
>>
>> Absolutely no idea.
>>
>> How would I make it async-signal safe
>
> Well, my understanding is that you'd be limited to functions listed  
> in the man page for sigaction(2).  So strdup/getenv/etc would be off  
> limits.  Not much fun.

Indeed. I very much doubt we could practically achieve what we need to  
with this limitation.

>> and why would I do this?
>
> My guess is that it would matter if code using the library relies on  
> calling read() from a signal handler.  Signal handling is outside my  
> area of expertise, so I was hoping someone else would have an  
> answer :).

I am guessing this has something to do the $NOCANCEL symbol variant.

The document http://developer.apple.com/mac/library/releasenotes/Darwin/SymbolVariantsRelNotes/index.html 
  just notes that it is for internal use.

I'll do some more research and let you know.