read from comport: windows vs. linux

Hi there I´ve got a problem porting from windows to Linux, when I wanna read and write to the serial port. This works like a charm in windows: if (!$fp = fopen("COM1", 'w+b')) { echo "\nError! Could not open COMport - Got a terminal open?\n"; exit; } The program continues, but breaks in linux: if (!$fp = fopen("/dev/ttyS0", 'w+b')) { echo "\nError! Could not open COMport - Got a terminal open?\n"; exit; } I´ve checked and made sure that there´s a device on /dev/ttyS0 with minicom, where I´ve got no problem accessing the device. But I keep getting this error: Warning: fopen(/dev/ttyS0): failed to open stream: Permission denied in /var/www/html/s.php on line 85 Line 85 is the fopen line. Permissions are: crw-rw-rw- 1 root uucp 4, 64 Apr 5 13:38 /dev/ttyS0 having apache be the groupowner doesn´t change anything Now, what have I missed? -- Med venlig hilsen / best regards ComX Networks A/S Kim Madsen Systemudvikler/systemdeveloper