PR/46248 CVS commit: src/sys

["Jaromir Dolecek" <jdolecek%netbsd.org@localhost>]

The following reply was made to PR kern/46248; it has been noted by GNATS.

From: "Jaromir Dolecek" <jdolecek%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/46248 CVS commit: src/sys
Date: Sun, 2 May 2021 19:13:43 +0000

 Module Name:	src
 Committed By:	jdolecek
 Date:		Sun May  2 19:13:43 UTC 2021
 
 Modified Files:
 	src/sys/kern: kern_event.c
 	src/sys/sys: eventvar.h
 
 Log Message:
 implement fo_restart hook for kqueue descriptors, so that close(2)
 on the descriptor won't block indefinitely if other thread is currently
 blocked on the same kqueue in kevent(2)
 
 done similarily to pipes and sockets, i.e. using flag on the potentially
 shared kqueue structure hooked off file_t - this is somewhat suboptimal
 if the application dup(2)ped the descriptor, but this should be rare
 enough to not really matter
 
 usually this causes the kevent(2) to end up returning EBADF since
 on the syscall restart the descriptor is not there anymore; if
 dup(2)ped the kevent(2) call can continue successfully if the closed
 kqueue descriptor was other than the one used for the kevent(2)
 call
 
 PR kern/46248 by Julian Fagir
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.117 -r1.118 src/sys/kern/kern_event.c
 cvs rdiff -u -r1.8 -r1.9 src/sys/sys/eventvar.h
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.