pySerial in a daemon process

[Lawrence D'Oliveiro]

In message <1188166098.738058.182580 at w3g2000hsg.googlegroups.com>, paul
wrote:

> Before I had posted this question first thing I did was to look at /
> dev/ttyS0, and indeed the group is dialout (gid=20)...

What are the full protections on the serial port? That is, can you post the
output of

    ls -l /dev/ttyS0

please?