[issue6868] Check errno of epoll_ctrl

[A.M. Kuchling]

A.M. Kuchling added the comment:

I don't understand the bug being reported.  The code you quote should 
probably be written as "if (result < 0 && errno == EBADF)", but the block's net effect is to ignore an error by resetting result and errno.  
It doesn't matter if we occasionally set result and errno to 0 when result is already zero, but errno happens to be set to EBADF from some earlier operation.

The open('xxx', O_RDONLY) would raise an exception, not return a fd of -1, so I don't see how that can be used to trigger a problem.

Therefore I'll close this issue, but am willing to re-open it if someone can explain a way this code could actually cause problems.

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nosy: +akuchling
resolution:  -> wont fix
stage: test needed -> committed/rejected
status: open -> closed

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<http://bugs.python.org/issue6868>
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