sizeof(struct timeval)

[Tony Houghton]

I'm writing a python program which reads input device events so it needs
to know sizeof(struct timeval). By using the struct module I should be
able to work out sizeof(long) from python, but I can't think of a way to
measure non-fundamental types without including a little bit of C,
which I'd rather avoid.

How safe would I be assuming that 

    sizeof(struct timeval) == 2 * sizeof(long)

is always true on Linux on different architectures? AFAIK the input
device interface is Linux-specific so I don't need to worry about other
OS's.

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