From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arseny Maslennikov Subject: Re: [PATCH v2 0/7] TTY Keyboard Status Request Date: Mon, 29 Jul 2019 13:56:12 +0300 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" Return-path: Content-Disposition: inline In-Reply-To: <20190625161153.29811-1-ar@cs.msu.ru> Sender: linux-kernel-owner@vger.kernel.org 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 List-Id: linux-serial@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--