> you propose <machine/setjmp_jblen.h>.  actually, i think it should
> simply be <machine/setjmp.h>.

Agreed.

> also, i believe that jmp_buf (and sigjmp_buf) should be arrays of
> 'long's rather than arrays of ints.

This should depend on the machine. I.e., the typedef for jmp_buf should be
completely in machine/setjmp.h, not only the length of it. This way, you
could even have more sophisticated jmp_bufs, e.g. on machines with most
registers 64 bits, but one or two with 32 bits, which would otherwise
require some hackery.
--
ws@TooLs.DE     (Wolfgang Solfrank, TooLs GmbH) 	+49-228-985800