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=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 2F747C433DF for ; Mon, 12 Oct 2020 13:41:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D1C3322202 for ; Mon, 12 Oct 2020 13:41:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602510092; bh=0eJa7RhJIardyML5iBkzlYb6QbrNEuYZ1CbCF0lDW1s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Rr1c4gHrnO520yL89ji07E5xhaO+4z1jKZbSZFAMc3ErERjYjn+yIT+5ETNvCgvI5 nqZfMnOelKJ8+5Z6dNTu+Qko7FFf6I+8FYqunRswf90SHjiL3//p+9fYJcnG0fo73/ MC7w5INAsK8JA/cRoR6q5QZwN25aJ8Zgo0wXDi+g= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730800AbgJLNlc (ORCPT ); Mon, 12 Oct 2020 09:41:32 -0400 Received: from mail.kernel.org ([198.145.29.99]:44166 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389009AbgJLNlA (ORCPT ); Mon, 12 Oct 2020 09:41:00 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1956E20678; Mon, 12 Oct 2020 13:40:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602510058; bh=0eJa7RhJIardyML5iBkzlYb6QbrNEuYZ1CbCF0lDW1s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oC4+Wl+WbZFwrzhradSr6rI+5z12uIF268AQ3486b/J9XveIaAhdoIlp7Rjgrd19M vG8X4z5IqSBM4ulTGah8i8ZrXS4p3DAuz6GRZwS/gKJMqusmhI+Xt0Xsaly/7+4H24 cjzj2mtywQ7JJwR9Vlb0BjIxidUflZF9c5Ny1nvA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tommi Rantala , Arnaldo Carvalho de Melo , Alexander Shishkin , Jiri Olsa , Mark Rutland , Namhyung Kim , Peter Zijlstra Subject: [PATCH 5.4 23/85] perf top: Fix stdio interface input handling with glibc 2.28+ Date: Mon, 12 Oct 2020 15:26:46 +0200 Message-Id: <20201012132633.966541649@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201012132632.846779148@linuxfoundation.org> References: <20201012132632.846779148@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tommi Rantala commit 29b4f5f188571c112713c35cc87eefb46efee612 upstream. Since glibc 2.28 when running 'perf top --stdio', input handling no longer works, but hitting any key always just prints the "Mapped keys" help text. To fix it, call clearerr() in the display_thread() loop to clear any EOF sticky errors, as instructed in the glibc NEWS file (https://sourceware.org/git/?p=glibc.git;a=blob;f=NEWS): * All stdio functions now treat end-of-file as a sticky condition. If you read from a file until EOF, and then the file is enlarged by another process, you must call clearerr or another function with the same effect (e.g. fseek, rewind) before you can read the additional data. This corrects a longstanding C99 conformance bug. It is most likely to affect programs that use stdio to read interactive input from a terminal. (Bug #1190.) Signed-off-by: Tommi Rantala Tested-by: Arnaldo Carvalho de Melo Cc: Alexander Shishkin Cc: Jiri Olsa Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lore.kernel.org/lkml/20200305083714.9381-2-tommi.t.rantala@nokia.com Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Greg Kroah-Hartman --- tools/perf/builtin-top.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -683,7 +683,9 @@ repeat: delay_msecs = top->delay_secs * MSEC_PER_SEC; set_term_quiet_input(&save); /* trash return*/ - getc(stdin); + clearerr(stdin); + if (poll(&stdin_poll, 1, 0) > 0) + getc(stdin); while (!done) { perf_top__print_sym_table(top);