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Bug #409

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CB

Detection of pipe close with POLLHUP poll(3) event

Bug #409: Detection of pipe close with POLLHUP poll(3) event

Added by Christian Babeux almost 13 years ago. Updated about 10 years ago.

Status:
Confirmed
Priority:
Low
Assignee:
-
Target version:
LTTng - Wishlist
Start date:
12/10/2012
Due date:
% Done:

0%

Estimated time:

Description

On Linux, the POLLHUP poll(3) event is used to signal that the other end
of a pipe has been disconnected. Due to poor wording in the Single UNIX
Specification, differents UNIX implementation signal the EOF with
conflicting poll events [1].

The current implementation of pipe close detection in lttng-tools uses
the POLLHUP event. This could lead to infinite looping in threads on
platforms such as OpenBSD/Cygwin.

Possible workaround in 060a32b279132ceeeef14b96a611077195a2ca46.

Creating this issue so we don't forget this limitation if we want eventually
want to support those platforms.

[1] - http://www.greenend.org.uk/rjk/tech/poll.html

CB Updated by Christian Babeux almost 13 years ago Actions
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 #1

  • Project changed from LTTng to LTTng-tools

DG Updated by David Goulet almost 13 years ago Actions
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 #2

  • Status changed from New to Confirmed

When clearly supporting OpenBSD, we should make sure we fix that. I'll keep this open so to remind us at that point.

JG Updated by Jérémie Galarneau about 10 years ago Actions
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 #3

  • Target version set to Wishlist
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