"It's pronounced 'volatile pointer to tvbuff_t' but it's spelled

"It's pronounced 'volatile pointer to tvbuff_t' but it's spelled
'tvbuff_t *volatile'."  Makes "Throat-Warbler Mangrove" vs.
"Luxury-Yacht" sound almost normal....

Type-qualified pointers to non-type-qualified objects are a barrel of
fun in C.  The way you declare a volatile pointer named "bar" to a
*non-volatile* "foo" is

	foo *volatile bar;

as opposed to a non-volatile pointer "bar" to a volatile "foo", which is

	volatile foo *bar;

GCC's complaint about variables being clobbered by longjmp refers to the
fact that "longjmp()" isn't guaranteed to restore variables stored in
registers to the values they had at the time of the "longjmp()" (if
"setjmp()" stuffs the current register values in the "jmp_buf", and
"longjmp()" just reloads them rather than walking the stack to restore
all register values pushed onto the stack, the values at the time of the
"setjmp()" will be restored, clobbering any updates done after the
"setjmp()"); the workaround provided in ANSI C is to declare the
variables in question "volatile", which will keep them out of registers
(or any other place that "setjmp()"/"longjmp()" can't handle).

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