Re: Edge triggered epoll with pts devices acts as level triggered

From: Adam Langley (alangley_at_gmail.com)
Date: 08/12/05

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    Date:	Fri, 12 Aug 2005 18:30:55 +0100
To: linux-kernel@vger.kernel.org

    On 8/12/05, Adam Langley <alangley@gmail.com> wrote:
    > Waiting for edge triggered events (with EPOLLET) on pseudo terminal
    > devices appears to act as if it were level triggered; when data is
    > ready the fd is always returned by epoll_wait.

    This occurs because writing to the terminal happens to cause a read
    event to occur for pseudo terminals, but not for real terminals. This
    is much less of a problem than the orginal message would suggest.

    AGL 

    -- 
Adam Langley                                      agl@imperialviolet.org
http://www.imperialviolet.org                       (+44) (0)7906 332512
PGP: 9113   256A   CC0F   71A6   4C84   5087   CDA5   52DF   2CB6   3D60
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