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To: Alain Williams <addw@phcomp.co.uk>
Date: Mon, 16 Sep 2013 13:17:21 -0700
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Subject: Re: [PHP-DEV] PHP CLI setting cooked terminal mode
From: ezyang@MIT.EDU ("Edward Z. Yang")

I've seen something similar on Debian; it might be a patch that
your distro is shipping on top of PHP.

Edward

Excerpts from Alain Williams's message of Sat Sep 14 04:45:41 -0700 2013:
> Hi,
> 
> I am running a PHP script at the command line and piping the output through less:
> 
>     ./myScript | less
> 
> Since less is an interactive program it puts the terminal into 'raw' mode so
> that it can read characters one at a time. However, when I do the above I find
> that the commands that I type to less are echoed back to me and not acted on
> until I type <RETURN>. This is not as it should be.
> 
> The sript is not doing anything clever, just generating 100 lines:
>     for($i = 0; $i < 100; $i++)
>         echo "i=$i\n";
> 
> If I run the script under strace I see:
> 
>     ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
>     ioctl(0, SNDCTL_TMR_STOP or TCSETSW, {B38400 opost isig icanon echo ...}) = 0
> 
> What is happening is that PHP is putting the terminal into cooked mode.
> 
> 
> I can get it to not do this by connecting stdin to /dev/null:
> 
>     ./myScript < /dev/null | less
> 
> another way of getting it to work is (and this shows that it really is PHP that
> is messing the tty modes):
> 
>     ./myScript < /dev/null | (sleep 10; less)
> 
> However: PHP should not set the terminal to cooked mode in the first place.
> 
> Is there any way in which I can get PHP to not do this ?
> 
> TIA
> 
> I am running PHP 5.3.3 on CentOS 6.
> 
> I posted this to php-general@lists.php.net a few days ago, but did not get a
> sensible reply.
>