php "system"-call to access tty port, "error accessing"
I have IR module in connected to a tty port, and I'm trying to run an application that would read data from that port, but for some reason my PHP script on Apache can't seem to read the serial port.
The user (www-data) has access to dialup group (in /etc/group), and if I switch over to www-data user, I am able to successfully run the program from the same folder where it resides (same folder with PHP script).
I checked the user who runs the PHP script by system call from PHP to 'whoami' and print it on screen, this is correct, right ?
I'm out of ideas, why Apache can't seem to access the port.
The program starts ok, and I get some proper output, but once trying to access the serial port, something goes awry..
Thanks for all the hints!
Last edited by wedz; 05-03-2012 at 06:35 AM.
Reason: more information