Linux also honours them as 4.4BSD does - its a very useful property.
> Check <sys/tl.h>. First you'll need to switch on credentials exchanging
> w/ TL_IOC_CREDOPT and then you'll receive the credentials as options
> with the data.
Linux has a socket equivalent of this in 2.1.x. I'd like to see the BSD
people take it up too if someone wants to discuss it further..