When exactly does a socket timeout get triggered?

[Nathan P. Gardner]

When exactly does a socket timeout get triggered?


Is it when the SO_TIMEOUT time has been reached and the first byte of data 
has not been received?

Or is it when the SO_TIMEOUT time has been reached and the last byte of 
data has not been received?


In other words, if you start receiving data before the SO_TIMEOUT time has 
been reached, but are still receiveing data after the SO_TIMEOUT time has 
been reached, does this cause a timeout or not?


Thanks,
Nate Gardner