Date: Thu, 25 Oct 2001 15:56:14 -0400 (EDT) From: Robert Watson <rwatson@FreeBSD.org> To: arch@FreeBSD.org Subject: Behavior of select() on pipes Message-ID: <Pine.NEB.3.96L.1011025155337.73574A-100000@fledge.watson.org>
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Alfred recently pointed me at some FreeBSD pipe behavior that I was previously unaware of: select() will always return true regarding the readability of a fifo, regardless of whether data is pending on the fifo. He referred to this as "brokenness", which is a diagnosis I tend to accept. However, it turns out to be somewhat more complicated than I thought, witnessed by the extensive discussion on freebsd-bugs, and logged in PR/19871. But to the short of it: it sounds to me like we should modify the behavior of select() to match the more popular (but possibly standards-incompliant) behavior, which allows select to block on the fifo until data is ready (found in Solaris, Linux, et al). Rather than just commit the patch, I thought I'd open myself up for broad flamage. Comments on what to do are welcome. Robert N M Watson FreeBSD Core Team, TrustedBSD Project robert@fledge.watson.org NAI Labs, Safeport Network Services To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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