From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=DKIM_ADSP_ALL,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E3341C433FF for ; Mon, 29 Jul 2019 10:56:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AEB5F20679 for ; Mon, 29 Jul 2019 10:56:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=cs.msu.ru header.i=@cs.msu.ru header.b="hIUQiUYJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387569AbfG2K4X (ORCPT ); Mon, 29 Jul 2019 06:56:23 -0400 Received: from mx.cs.msu.ru ([188.44.42.42]:42647 "EHLO mail.cs.msu.ru" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2387424AbfG2K4W (ORCPT ); Mon, 29 Jul 2019 06:56:22 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=cs.msu.ru; s=dkim; h=Subject:In-Reply-To:Content-Type:MIME-Version:References: Message-ID:Cc:To:From:Date:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=KhDc0y3uqAsWa5PYel9fH/ttSxd0IlvtLtCn7+kzD+g=; b=hIUQiUYJS6l8mNK6X1i6x9OtN7 nlKtUuF0eBYFegEIhnp3w9scJf/FCDoFi66i4Mw0yTB2XylZj6filLde44+goR1fcyFDonKn8zEOs kFsKCs67vmLoll+xmvAJ//cql/KwTfQ3RhPzh97o5kkNlflrTA1DXCQRTBS5iF7ROY8mXT/8EO6Ja pBrme3KTIF5wLlsx3nxlj2a7xslxVurx/5NQW53nkjiiv8kVrA95SGhwbPSsVB9NuDa2eY/+1tDip beKZnZtiED0JuQPvb3E+nXC0Jrnl88G37fCyfN1gzDL30Y5nYr4T+Knkt1rRbG+Gac2QZNHxsVhVF ja7jngmQ==; Received: from [37.204.119.143] (port=58278 helo=cello) by mail.cs.msu.ru with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.92 (FreeBSD)) (envelope-from ) id 1hs3KA-0008RA-78; Mon, 29 Jul 2019 13:56:14 +0300 Date: Mon, 29 Jul 2019 13:56:12 +0300 From: Arseny Maslennikov To: Greg Kroah-Hartman , Jiri Slaby , Ingo Molnar , Peter Zijlstra , linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org Cc: "Vladimir D. Seleznev" , Rob Landley , "Eric W. Biederman" , Pavel Machek Message-ID: <20190729105612.GB25742@cello> References: <20190625161153.29811-1-ar@cs.msu.ru> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="ZoaI/ZTpAVc4A5k6" Content-Disposition: inline In-Reply-To: <20190625161153.29811-1-ar@cs.msu.ru> OpenPGP: url=http://grep.cs.msu.ru/~ar/pgp-key.asc User-Agent: Mutt/1.10.1 (2018-07-13) X-SA-Exim-Connect-IP: 37.204.119.143 X-SA-Exim-Mail-From: ar@cs.msu.ru Subject: Re: [PATCH v2 0/7] TTY Keyboard Status Request X-SA-Exim-Version: 4.2 X-SA-Exim-Scanned: Yes (on mail.cs.msu.ru) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --ZoaI/ZTpAVc4A5k6 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Jun 25, 2019 at 07:11:46PM +0300, Arseny Maslennikov wrote: > This patch series introduces TTY keyboard status request, a feature of > the n_tty line discipline that reserves a character in struct termios > (^T by default) and reacts to it by printing a short informational line > to the terminal and sending a Unix signal to the tty's foreground > process group. The processes may, in response to the signal, output a > textual description of what they're doing. >=20 > The feature has been present in a similar form at least in > Free/Open/NetBSD; it would be nice to have something like this in Linux > as well. There is an LKML thread[1] where users have previously > expressed the rationale for this. >=20 > The current implementation does not break existing kernel API in any > way, since, fortunately, all the architectures supported by the kernel > happen to have at least 1 free byte in the termios control character > array. >=20 > The series should cleanly apply to tty-next. >=20 > To thoroughly test these, one might need at least a patched stty among > other tools, so I've brought up a simple initrd generator[2] which can > be used to create a lightweight environment to boot up in a VM and to > fiddle with. >=20 > [1] https://lore.kernel.org/lkml/1415200663.3247743.187387481.75CE9317@we= bmail.messagingengine.com/ > [2] https://github.com/porrided/tty-kb-status-userspace >=20 > v2 <- v1: removed useless debugging bits. >=20 > Discussion of v1: > https://lore.kernel.org/lkml/20190605081906.28938-1-ar@cs.msu.ru/ >=20 > Arseny Maslennikov (7): > signal.h: Define SIGINFO on all architectures > tty: termios: Reserve space for VSTATUS in .c_cc > n_tty: Send SIGINFO to fg pgrp on status request character > linux/signal.h: Ignore SIGINFO by default in new tasks > tty: Add NOKERNINFO lflag to termios > n_tty: ->ops->write: Cut core logic out to a separate function > n_tty: Provide an informational line on VSTATUS receipt >=20 > arch/alpha/include/asm/termios.h | 4 +- > arch/alpha/include/uapi/asm/termbits.h | 2 + > arch/arm/include/uapi/asm/signal.h | 1 + > arch/h8300/include/uapi/asm/signal.h | 1 + > arch/ia64/include/asm/termios.h | 4 +- > arch/ia64/include/uapi/asm/signal.h | 1 + > arch/ia64/include/uapi/asm/termbits.h | 2 + > arch/m68k/include/uapi/asm/signal.h | 1 + > arch/mips/include/asm/termios.h | 4 +- > arch/mips/include/uapi/asm/signal.h | 1 + > arch/mips/include/uapi/asm/termbits.h | 2 + > arch/parisc/include/asm/termios.h | 4 +- > arch/parisc/include/uapi/asm/signal.h | 1 + > arch/parisc/include/uapi/asm/termbits.h | 2 + > arch/powerpc/include/asm/termios.h | 4 +- > arch/powerpc/include/uapi/asm/signal.h | 1 + > arch/powerpc/include/uapi/asm/termbits.h | 2 + > arch/s390/include/asm/termios.h | 4 +- > arch/s390/include/uapi/asm/signal.h | 1 + > arch/sparc/include/asm/termios.h | 4 +- > arch/sparc/include/uapi/asm/signal.h | 2 + > arch/sparc/include/uapi/asm/termbits.h | 2 + > arch/x86/include/uapi/asm/signal.h | 1 + > arch/xtensa/include/uapi/asm/signal.h | 1 + > arch/xtensa/include/uapi/asm/termbits.h | 2 + > drivers/tty/Makefile | 3 +- > drivers/tty/n_tty.c | 70 ++++- > drivers/tty/n_tty_status.c | 337 +++++++++++++++++++++++ > include/asm-generic/termios.h | 4 +- > include/linux/sched.h | 7 + > include/linux/signal.h | 5 +- > include/linux/tty.h | 7 +- > include/uapi/asm-generic/signal.h | 1 + > include/uapi/asm-generic/termbits.h | 2 + > 34 files changed, 457 insertions(+), 33 deletions(-) > create mode 100644 drivers/tty/n_tty_status.c >=20 > Date: Tue, 25 Jun 2019 19:11:46 +0300 Ping. The series should cleanly apply to 5.3-rc2 and to tty-next as of writing this email. --ZoaI/ZTpAVc4A5k6 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEE56JD3UKTLEu/ddrm9dQjyAYL01AFAl0+0MwACgkQ9dQjyAYL 01CceRAAxHmrLCcZw6xWtjgyTLTvK2ktb1A5NKNpAErfPmBihjA7Vn5k9QBBegyL uRv95D/Hoz1LSXP7rwaQvKdH00S/ZlkHFHdw6hH7Q4gE6lN9L3jJoFY+lX9/9Oqw BCa94zOedislJIgRqPfs/OicYaSpHndNStfej9tFvhk43q0eULS+f9jxDsrO85BY nFbV2ECs3rd6ujT7tZj1Wc/NhViz0BsPDpfwassNov8Ik/L1UA5KPh2N8ezapGr4 uP0K6YbDXfxQI2ivI2wB4d9BwNlAunDw0reVK2ENKw8vhWrsMbj9mLUexcaEJBbs nXxh4x7QdviSFmlgV0Jl/8Jwih4tijDuCcakV5IG2WPDSy04rKGJZeNvKDrVn2By GhHIqy7YTo7WLkRRM/Q24pG9wM5XX3TKemN4wIfkBsB+ZalxWtkWqsuOo1ftMBxk OUPl7PR25wUpKXGXVVzNB1rSvUHNaZNEe5tUSeOpMuhSNrI31EylxJOBNtm0yNsc lEpNNERaEo3hBWt4PCbXZk7J1xSAPMUsTnzz3ClwBGcLsd8DovajnRLNeN56ar00 uS/iSwCug8f45CQy99KsCbQfw0vpO1IPAIkmse7uYrERxSMmRCqkksBAcOmgJzoV i67Klay9PfUBNJyX3OLEAuOadYXdi7a4b0G7/BNMo7VH7IM4yq8= =hAzz -----END PGP SIGNATURE----- --ZoaI/ZTpAVc4A5k6--