Re: [Haskell-cafe] Preventing leaked open file descriptors whencatching exceptions

Ah, thanks Bryan. I hadn't looked into it enough to realize that FDs are just ints and not ForeignPtrs w/ finalizers. Re: Donn's point. Well, yes, that would seem to be the case! But since I think a linux bug is unlikely, I'm afraid that there's something else going on here which I am not thinking of. I'll make a self contained test of this and send it out. On Tue, Feb 21, 2012 at 12:53 PM, Donn Cave wrote:

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On Tue, Feb 21, 2012 at 8:16 AM, Ryan Newton wrote:

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FYI, lsof confirms that there are indeed many many open connections to

Quoth "Bryan O'Sullivan" , the

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same FIFO:

Like all of the lowest-level I/O functions, openFD just gives you back an integer, and the Fd type has no notion that there's an underlying system resource associated with it. It's your responsibility to manage it (i.e. clean up manually when catching an exception).

What's more - if I understood the hypothesis correctly, that the exception occurs during openFd - that fails to return an Fd because the open(2) system call fails to return one, so it would presumably be an OS level bug if there's really an open file descriptor left from this.

Donn

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