How big is time_t? Alignment?

[Hal Murray]

I was looking at the SHM layout, counting the size by hand.  The goal was to 
add a compile time sanity check.

I was off by 16 bytes.  :)  The first 8 were 2 time_t-s that I counted as 4 
bytes each rather than 8.  The other 8 were invisible padding so both of the 
time_t-s would be on 8 byte boundaries.

Are we interested in any systems with 32 bit time_t?
Do all the systems we are interested in put 64 bit things on 8 byte 
boundaries?


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