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Date:      Mon, 09 Aug 2021 09:55:27 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 256952] kqueue(2): Improve epoll Linux compatibility (compat/linux/linux_event)
Message-ID:  <bug-256952-227-2CSCSQmqq4@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-256952-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256952

--- Comment #6 from Vico <vico13.chen@gmail.com> ---
Created attachment 227040
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=227040&action=edit
Test cases

This test case only handles EPOLLRDHUP:
1. Run this case on Linux, it prints two lines that events are recieved(
'0x2010': EPOLLHUP & EPOLLRDHUP)
​2. Run this case on BSD, it will hang as no EPOLLHUP or EPOLLRDHUP reported.​
​3. Run this case on BSD with this patch, it prints two events:
   a. First: print 'eventmask 0'. EPOLLIN reported as READ, and this patch just
mask it but it still wake up the epoll_wait. (we have following patch to fix
this issue)
   b. Second: print 'eventmask 0x2010'. EPOLLHUP & EPOLLRDHUP are recieved for
close.

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