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 Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 695E8C433F5 for ; Tue, 18 Jan 2022 05:21:52 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4JdHFV5Lctz3cNk for ; Tue, 18 Jan 2022 16:21:50 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; secure) header.d=home.drummond.us header.i=@home.drummond.us header.a=rsa-sha256 header.s=default header.b=HrfroqxJ; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=home.drummond.us (client-ip=74.95.14.229; helo=talisker.home.drummond.us; envelope-from=walt@home.drummond.us; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; secure) header.d=home.drummond.us header.i=@home.drummond.us header.a=rsa-sha256 header.s=default header.b=HrfroqxJ; dkim-atps=neutral Received: from talisker.home.drummond.us (drummond.us [74.95.14.229]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4JdGZx0phKz2yLg for ; Tue, 18 Jan 2022 15:51:52 +1100 (AEDT) Received: from talisker.home.drummond.us (localhost [127.0.0.1]) by talisker.home.drummond.us (8.15.2/8.15.2/Debian-20) with ESMTP id 20I4hKxA765034; Mon, 17 Jan 2022 20:43:20 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=home.drummond.us; s=default; t=1642481000; bh=JFi+HKlyMuoco5DMezAYc0cpMIkALY2NRgqxQb8XaVQ=; h=From:To:Cc:Subject:Date:From; b=HrfroqxJrad3DzZ6FT4waFIt4MeHoVb4BxDueoszUUfOdgocQu4B3/GEGCbfH7j+4 bCnukvS8DMk0QncCM+4cnd67oBI11AUaZSfyA1jy6TaXA3X5Kcb8WqFT1lOO/G4bU0 sE937UadIfrwnyajiN2sClndEDW/LSMvKjwv+nnxvNZNZDwNa20sogsmB1xI0fuutp TyP5IwYKNFjesXLYErOM4Z88Ci8VqrvFMwxoLr+OAwdySfNxgdpWQg9mNN1heppfgk /c+IM2lyAghg9dy8t50eqPnrKRsXzAsmMkXQhyUwc1ZmqI7/AHP52rv9ZYELVdXPsV F6MVEFQaeeKrg== Received: (from walt@localhost) by talisker.home.drummond.us (8.15.2/8.15.2/Submit) id 20I4hDNe765026; Mon, 17 Jan 2022 20:43:13 -0800 From: Walt Drummond To: agordeev@linux.ibm.com, arnd@arndb.de, benh@kernel.crashing.org, borntraeger@linux.ibm.com, chris@zankel.net, davem@davemloft.net, gregkh@linuxfoundation.org, hca@linux.ibm.com, deller@gmx.de, ink@jurassic.park.msu.ru, James.Bottomley@HansenPartnership.com, jirislaby@kernel.org, mattst88@gmail.com, jcmvbkbc@gmail.com, mpe@ellerman.id.au, paulus@samba.org, rth@twiddle.net, dalias@libc.org, tsbogend@alpha.franken.de, gor@linux.ibm.com, ysato@users.osdn.me Subject: [PATCH 0/3] status: TTY status message request Date: Mon, 17 Jan 2022 20:42:57 -0800 Message-Id: <20220118044259.764945-1-walt@drummond.us> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Mailman-Approved-At: Tue, 18 Jan 2022 16:20:39 +1100 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, linux-ia64@vger.kernel.org, linux-parisc@vger.kernel.org, linux-sh@vger.kernel.org, linux-xtensa@linux-xtensa.org, walt@drummond.us, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-alpha@vger.kernel.org, sparclinux@vger.kernel.org, ar@cs.msu.ru, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" This patchset adds TTY status message request feature to the n_tty line dicipline. This feature prints a brief message containing basic system and process group information to a user's TTY in response to a new control character in the line dicipline (default Ctrl-T) or the TIOCSTAT ioctl. The message contains the current system load, the name and PID of an interesting process in the forground process group, it's run time, percent CPU usage and RSS. An example of this message is: load: 0.31 cmd: sleep 3616843 [sleeping] 0.36r 0.00u 0.00s 0% 696k User API visible changes are limited to: - The addition of VSTATUS in termios.c_cc[] - The addition of NOKERNINFO bit in termios.l_cflags - The addition of the TIOCSTAT ioctl number None of these changes break the existing kernel api as the termios structure on all architectures has enough space in the control character array (.c_cc) for the new character, and the other changes are space agnostic. This feature is in many other Unix-like systems, both current and historical. In other implementations, this feature would also send SIGINFO to the process group; this implementation does not. Walt Drummond (3): vstatus: Allow the n_tty line dicipline to write to a user tty vstatus: Add user space API definitions for VSTATUS, NOKERNINFO and TIOCSTAT status: Display an informational message when the VSTATUS character is pressed or TIOCSTAT ioctl is called. arch/alpha/include/asm/termios.h | 4 +- arch/alpha/include/uapi/asm/ioctls.h | 1 + arch/alpha/include/uapi/asm/termbits.h | 34 ++--- arch/ia64/include/asm/termios.h | 4 +- arch/ia64/include/uapi/asm/termbits.h | 34 ++--- arch/mips/include/asm/termios.h | 4 +- arch/mips/include/uapi/asm/ioctls.h | 1 + arch/mips/include/uapi/asm/termbits.h | 36 ++--- arch/parisc/include/asm/termios.h | 4 +- arch/parisc/include/uapi/asm/ioctls.h | 1 + arch/parisc/include/uapi/asm/termbits.h | 34 ++--- arch/powerpc/include/asm/termios.h | 4 +- arch/powerpc/include/uapi/asm/ioctls.h | 2 + arch/powerpc/include/uapi/asm/termbits.h | 34 ++--- arch/s390/include/asm/termios.h | 4 +- arch/sh/include/uapi/asm/ioctls.h | 1 + arch/sparc/include/uapi/asm/ioctls.h | 1 + arch/sparc/include/uapi/asm/termbits.h | 38 +++--- arch/xtensa/include/uapi/asm/ioctls.h | 1 + drivers/tty/Makefile | 2 +- drivers/tty/n_tty.c | 113 +++++++++++----- drivers/tty/n_tty_status.c | 162 +++++++++++++++++++++++ drivers/tty/tty_io.c | 2 +- include/asm-generic/termios.h | 4 +- include/linux/tty.h | 123 ++++++++--------- include/uapi/asm-generic/ioctls.h | 1 + include/uapi/asm-generic/termbits.h | 34 ++--- 27 files changed, 461 insertions(+), 222 deletions(-) create mode 100644 drivers/tty/n_tty_status.c -- 2.30.2