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Date: Sat, 14 Sep 2013 12:45:41 +0100
To: PHP internals <internals@lists.php.net>
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Organization: Parliament Hill Computers Ltd
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Subject: PHP CLI setting cooked terminal mode
From: addw@phcomp.co.uk (Alain Williams)

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.

-- 
Alain Williams
Linux/GNU Consultant - Mail systems, Web sites, Networking, Programmer, IT Lecturer.
+44 (0) 787 668 0256  http://www.phcomp.co.uk/
Parliament Hill Computers Ltd. Registration Information: http://www.phcomp.co.uk/contact.php
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