I guess my concern is why the invalid open returned true.

Because the (piped) open succeeded. It found and successfully ran the prince executable.

The problem is that you are attributing the failed close to the failure to find the non-existent file; which is wrong.

What you are attempting to close is the pipe to the prince executable; which fails because the executable closed its end of the pipe, when it terminated because it couldn't find the file.

Bottom line: You cannot close the pipe because it is already closed. The confusion arises because you are attributing the failed close to the failure of the file to exist; rather than the fact the the pipe was already closed.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority". I knew I was on the right track :)
In the absence of evidence, opinion is indistinguishable from prejudice.
I'm with torvalds on this Agile (and TDD) debunked I told'em LLVM was the way to go. But did they listen!

In reply to Re^3: Can't close pipe to invalid process by BrowserUk
in thread Can't close pipe to invalid process by cLive ;-)

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