On Sat, Jul 27, 2013 at 12:12:57PM -0400, Rich Felker wrote:
> By the way, I do have another horrible idea for how you could do it.
> glibc's jmp_buf is actually a sigjmp_buf and contains 120 wasted bytes
> of sigset_t for nonexistant HURD signals. So you could store a few
> registers after the actually-used part of the sigset_t.
And another, possibly more acceptable way to do it:
#define setjmp(x) __new_setjmp(x, (__new_jmp_buf){0}, sizeof(__new_jmp_buf))
This would allocate the extra space on the caller's stack with a
lifetime equivalent to the validity lifetime of the jmp_buf, so it
should be valid, but I'm not sure if it covers all the needed cases
for interaction between old code and new code.
Rich
