From owner-freebsd-bugs@freebsd.org Fri Jun 30 21:53:05 2017 Return-Path: Delivered-To: freebsd-bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 28D91D9B760 for ; Fri, 30 Jun 2017 21:53:05 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 1720C7E41E for ; Fri, 30 Jun 2017 21:53:05 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id v5ULr4Wj083550 for ; Fri, 30 Jun 2017 21:53:04 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 220398] lio_listio(2) never sends asynchronous notification if nent==0 Date: Fri, 30 Jun 2017 21:53:05 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: asomers@FreeBSD.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter attachments.created Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Jun 2017 21:53:05 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D220398 Bug ID: 220398 Summary: lio_listio(2) never sends asynchronous notification if nent=3D=3D0 Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: asomers@FreeBSD.org Created attachment 183968 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D183968&action= =3Dedit Reproduction program It may seem stupid, but you can call lio_listio(2) with an empty aiocb list= . I would naively expect lio_listio to do nothing and return in that case. Ind= eed, that's what it does when mode =3D=3D LIO_WAIT. However, if mode =3D=3D LIO= _NOWAIT, then asynchronous notifications never get delivered. With SIGEV_KEVENT, no kevent is ever delivered, and with SIGEV_SIGNAL, no signal is ever delivere= d.=20 I haven't checked other SIGEV_ values. The attached program demonstrates the problem: it calls lio_listio with LIO_NOWAIT and notification via SIGTERM. But no signal ever gets delivered= , so the program exits normally. jhb feels that the Open Group's specification is ambiguous on this point, b= ut that sending asynchronous notification immediately would be sensible. --=20 You are receiving this mail because: You are the assignee for the bug.=