mdocml-1.13.4 regression: mandoc -a with pipes

mdocml-1.13.4 regression: mandoc -a with pipes

[Christian Neukirchen]

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.

cu,
-- 
Christian Neukirchen  <chneukirchen@gmail.com>  http://chneukirchen.org
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Re: mdocml-1.13.4 regression: mandoc -a with pipes

[Christian Neukirchen]

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
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