From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mail-wm0-f44.google.com (mail-wm0-f44.google.com [74.125.82.44])
	by fantadrom.bsd.lv (OpenSMTPD) with ESMTP id 9d6c00ff
	for <tech@mdocml.bsd.lv>;
	Mon, 5 Sep 2016 08:27:36 -0500 (EST)
Received: by mail-wm0-f44.google.com with SMTP id 1so139444311wmz.1
        for <tech@mdocml.bsd.lv>; Mon, 05 Sep 2016 06:27:35 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=from:to:subject:references:date:in-reply-to:message-id:user-agent
         :mime-version;
        bh=hydtWc/gTkcJMNDsb7tFvfK+6fhwrq6Bksw6NeYuA4Y=;
        b=nIvu967fcckJoE7B0iQgyFaT6/TQsHE6mgG/rXlFo9qfNhm1Ko5ae6z5n8FLHs8YPT
         ptUsDt6JsbWmfl2sFVNrfdYQRdS6HAYifcPwpF0HV10dnDaKjSScxx4BCwsHK1nkbuCN
         S8/TsGqlG+BboBA4DGqcH3r4c9+PV/LFaJdfIIN4jVMfv53DA0zjzGx7OOdEfyOkizQA
         HYcwEB/pCKE8jxu/KeawuOJe9lRjCl2IfVQrQzbVitNi4UaC/spGfy8L3kx1LoA4N9nl
         KmhB25etuQIpBLlf9BdowOjqEJiy9Nx1McZSI1Ruy6KnQwAV9HyaCkUQt4kH353YRZqC
         Irsw==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20130820;
        h=x-gm-message-state:from:to:subject:references:date:in-reply-to
         :message-id:user-agent:mime-version;
        bh=hydtWc/gTkcJMNDsb7tFvfK+6fhwrq6Bksw6NeYuA4Y=;
        b=V61jqli7b3SQ6Lr5bklRL4D4U/dusdkH75wF2Xpl+H66r2UFL0cRio88wqIuCwGn3y
         tKYSIYIhufO9YoQwDHBCWgEBJ1hv45DIJ5gI3NpZA8j/CBNj6+WtOd38PMrcVAKx/ZXW
         pBpP2dsOtawsIu+4OEmYsJUUuJOOunUHmn1EUyM1iDwStKp/9vvh7nWOEL4gJXkluDxn
         wZHtniK54USJxvho81Q8aNjJH6vKiDIMM6e0c+XVpRZH/nMzF26HW8e+LPOhdWlIdn5l
         DXU4jYY7I8bqVMNIuxfUi4cCmMZHptKs6HuebBrfg5nS+6K+VfvFM81sC+/CvrbUv/20
         1Vjg==
X-Gm-Message-State: AE9vXwOweXbVT0efw635RnCBRJq1dtwh6EYvHxtmWfl/hT8HSLAN+zr39djrvckQoz1tCA==
X-Received: by 10.28.15.3 with SMTP id 3mr14821052wmp.31.1473082051861;
        Mon, 05 Sep 2016 06:27:31 -0700 (PDT)
Received: from juno.home.vuxu.org ([2001:4ca0:0:f231:a288:b4ff:fea1:ce50])
        by smtp.gmail.com with ESMTPSA id 190sm20882056wmk.13.2016.09.05.06.27.30
        for <tech@mdocml.bsd.lv>
        (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256);
        Mon, 05 Sep 2016 06:27:30 -0700 (PDT)
Received: from localhost (juno.home.vuxu.org [local])
	by juno.home.vuxu.org (OpenSMTPD) with ESMTPA id a3fbc2cb
	for <tech@mdocml.bsd.lv>;
	Mon, 5 Sep 2016 13:27:29 +0000 (UTC)
From: Christian Neukirchen <chneukirchen@gmail.com>
To: tech@mdocml.bsd.lv
Subject: Re: mdocml-1.13.4 regression: mandoc -a with pipes
References: <8737n1igd5.fsf@gmail.com>
Date: Mon, 05 Sep 2016 15:27:29 +0200
In-Reply-To: <8737n1igd5.fsf@gmail.com> (Christian Neukirchen's message of
	"Fri, 22 Jul 2016 22:10:14 +0200")
Message-ID: <87d1kijx32.fsf@juno.home.vuxu.org>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)
X-Mailinglist: mdocml-tech
Reply-To: tech@mdocml.bsd.lv
MIME-Version: 1.0
Content-Type: text/plain

Christian Neukirchen <chneukirchen@gmail.com> writes:

> Hi,
>
> I noticed a regression in the last mdocml release:
> The use of mandoc -a is broken when input comes from a pipe.
>
> $ cat /usr/share/man/man1/mandoc.1 | mandoc -a
> [1] + Stopped (signal)           cat /usr/share/man/man1/mandoc.1 | mandoc -a
>
> mandoc gets suspended with SIGSTOP, and foregrounding is not possible.
>
> Found on Void Linux, Linux 4.6.4, glibc 2.23, mdocml 1.13.4.

I bisected this to

Author: schwarze <schwarze>
Date:   Fri Nov 20 21:59:54 2015 +0000

    Fix multiple issues regarding process group and signal mask handling
    found by tb@ and millert@; parts of the code, in particular in tag.c,
    by millert@; OK millert@.

Interestingly, it doesn't break when I use musl libc.

I don't really understand what the code does, so help would be appreciated.

Thanks,
-- 
Christian Neukirchen  <chneukirchen@gmail.com>  http://chneukirchen.org
--
 To unsubscribe send an email to tech+unsubscribe@mdocml.bsd.lv