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I'm trying to send input to a screen session from php. So far I have followed the steps explained here
Is running GNU Screen suid root the only way to make multiuser mode work?

And I have set "multiuser on" and "acladd www-data" in the screenrc file (or well, no. in another file that I use by the -c option but still)

My problem now is that whenever i try to acess screen by php

exec('screen -S user/session -p 0 -X stuff "test"'."\n", $ret);  

I get the error:

Cannot opendir /var/run/screen/S-user: Permission denied
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migrated from stackoverflow.com Nov 1 '12 at 9:22

This question came from our site for professional and enthusiast programmers.

    
I have no idea why a question about using php belongs on this site rather than stackoverflow.. but apparently it does – Zlug Nov 1 '12 at 10:23
    
You're doing it wrong. ...that aside, maybe you will find this useful: unix.stackexchange.com/questions/2523/… – Ярослав Рахматуллин Nov 1 '12 at 12:09
    
I unfortunately didn't – Zlug Nov 1 '12 at 12:29

Permissions, Permissions, Permissions

The user that is running the PHP Interpreter does not have the required permissions to access the screen session that you have running.

You have given the user www-data permission to use the screen, however, access to the screen file is denied. Try and modify the permissions for the file to allow the www-data user to read/write.

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I figured that much, what I didn't figured was how to give it, if the dir itself has any other permission than 700 screen won't run – Zlug Nov 1 '12 at 7:39

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