> ntp tries to use SIGIO for UDP packets - but it is not implemented
> just until 2.1.126. Does the signal mechanism lead to a quicker
> response or, at least, to a more deterministic behavior compared to
> the select () system call? ntp relies on reading a timestamp
> directly after packet arrives, so using SIGIO could eventually
> increase accuracy.
if you need the time the packet arrived, and you are presently doing
something like:
recvmsg(...)
gettimeofday()
then I would suggest you look at ioctl(fd,SIOCGSTAMP,...) which will
give you the system time the last packet arrived...
-cw
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