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=-14.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, 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 167A6C433ED for ; Fri, 21 May 2021 11:11:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E8B2C613D8 for ; Fri, 21 May 2021 11:11:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234052AbhEULMj (ORCPT ); Fri, 21 May 2021 07:12:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53172 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229457AbhEULMi (ORCPT ); Fri, 21 May 2021 07:12:38 -0400 Received: from mail-wr1-x42d.google.com (mail-wr1-x42d.google.com [IPv6:2a00:1450:4864:20::42d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5FE52C061574 for ; Fri, 21 May 2021 04:11:14 -0700 (PDT) Received: by mail-wr1-x42d.google.com with SMTP id v12so20668702wrq.6 for ; Fri, 21 May 2021 04:11:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:references:cc:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=M8kAV1VYgJ7YPGtmnmEaWDtMYXJyD8NqO59+yTOh6bQ=; b=sI+YXE4O6TkdYYxhApgD/dEYFZGQ48PoiSP9dfSMiO2mg4zEJbIxSEO0HyZJkBf02X YN+brgPgJ208cSMbBGexWgFYlY9rnpxfuPCPDKIfwxDEK/cCbo8KITnpnRDks3EYZV8V ARYB0vcl+oSqV+VjR3ASpSP8pb2yqmj0E4rGCz7wsQ6AFDaYKacau4q482zfgfsIJ55o kFG36issLImj8SWfw/yv6QcHEMSnnRMQl5m1FsG9Co7LI/isN4Q3/39A2N6sG7DfWsyK 4EDGLEFyvBYuJmKzLakQH/knyfBWkvzjp6SU3lKmIcjr0O5bq0DsN8uIF5d5rTyxL0Ir nC4w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:cc:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=M8kAV1VYgJ7YPGtmnmEaWDtMYXJyD8NqO59+yTOh6bQ=; b=j8pStq0DL1w9nYACZ44vuVY66AaQFwE7FPASKoz8RQ+E9aC4gqwLlxJRtz+UZpRzW3 TVS4BQ97Oy5ZqujoDeQfMsGG/ozu/0KP5v1KkV1QaBm9G7FaZ16C7Uc+3hw3iwvuhqax owDIMKHSN4E39Xu4P4mnKBEqUec+Z6NlRdHMdPeXMPv7C1b5MgpdRypOFcGifivUqJHb RD+DZFcwEH9NFEMAJd6AnnQWfisPbAKaiRYEoTHBmPzlbJhIOOg4HOi2SkfKPct6jfNI EqTH8wrZniyckT1b2fS/u5dHuxvF4t6cRPVt7SfBNTMkQeH3K0Awq8wQ4UrxMIyCkaG8 9yAg== X-Gm-Message-State: AOAM531QEZGmwNIA02ZKCPve/bdoxUDW3Q4pzbXqY2qk/YzVR21JQnL1 g/PNILyriNtEw9Mdx6eKXyo= X-Google-Smtp-Source: ABdhPJx0Jt9Czh98l2rCzV/jrkL2J+LkSv+aEN6LARGlRH7EE1PFvRE2E1fDXGSJZ69mwTaDrTpUdA== X-Received: by 2002:a5d:64cf:: with SMTP id f15mr8737379wri.327.1621595473097; Fri, 21 May 2021 04:11:13 -0700 (PDT) Received: from [192.168.43.70] ([46.222.120.224]) by smtp.gmail.com with ESMTPSA id z6sm5860920wml.29.2021.05.21.04.11.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 21 May 2021 04:11:12 -0700 (PDT) Subject: Re: [PATCH] sigalstack.2: Mention the need for separate signal stacks for threads To: Florian Weimer References: <87h7iz4vy1.fsf@oldenburg.str.redhat.com> Cc: linux-man@vger.kernel.org, "Michael Kerrisk (man-pages)" From: "Alejandro Colomar (man-pages)" Message-ID: Date: Fri, 21 May 2021 13:11:11 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.0 MIME-Version: 1.0 In-Reply-To: <87h7iz4vy1.fsf@oldenburg.str.redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org [CC += mtk] Hi Florian, On 5/18/21 10:40 PM, Florian Weimer wrote: > Signed-off-by: Florian Weimer > I don't understand how this works, so I'll CC Michael so that he merges it. Thanks, Alex > --- > man2/sigaltstack.2 | 7 +++++-- > 1 file changed, 5 insertions(+), 2 deletions(-) > > diff --git a/man2/sigaltstack.2 b/man2/sigaltstack.2 > index 53268ccbe..1510a98ab 100644 > --- a/man2/sigaltstack.2 > +++ b/man2/sigaltstack.2 > @@ -54,7 +54,10 @@ alternate signal stack. > An alternate signal stack is used during the > execution of a signal handler if the establishment of that handler (see > .BR sigaction (2)) > -requested it. > +requested it using the > +.B SA_ONSTACK > +flag. Each thread that can execute such signal handlers needs its own > +separate alternate signal stack. > .PP > The normal sequence of events for using an alternate signal stack > is the following: > @@ -67,7 +70,7 @@ signal stack. > Use > .BR sigaltstack () > to inform the system of the existence and > -location of the alternate signal stack. > +location of the alternate signal stack for the current thread. > .TP > 3. > When establishing a signal handler using > -- Alejandro Colomar Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/ Senior SW Engineer; http://www.alejandro-colomar.es/