[snip]
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
[/snip]
You may also need to change the user/owner, depending on what Apache is running
as.
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