* Gave it a default argument, since we never actually care about it, but
it needs to have it to conform to the signal handler prototype
* Constricted the area locked by activeCrit to only the block that deals
with the connections vector, to lower the chance of a future badly
placed call to terminate() deadlocking the server instead
This change required sacrificing both code cleanliness and the specific
error reports from perror(). Those could have been kept with a portable
wrapper, but that's too much work. We'll do it if unforseen errors
arise.
