On Thu, Jun 5, 2008 at 9:31 AM, David Mosberger-Tang <[EMAIL PROTECTED]> wrote:
> > > However, for callers who just want to examine the stack, this could > > potentially be eliminated. Currently there is no way for the caller to > > express the intent at unw_getcontext() time. Looking at some of the > > other archs which have a hand coded getcontext.S (ia64, arm etc) - I > > don't see any calls to sigprocmask. Does this mean that > > Ltest-resume-sig is failing on those archs? > > I don't know about ARM, but I have never seen Ltest-resume-sig fail on > ia64 and I don't think it should. > The test seems to be relying on unw_resume/sigreturn unmasking all signals except for an arch specific _BLOCKABLE set. This set doesn't seem to be documented in any man page. But looking at the kernel sources: #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) On x86_64, glibc doesn't expose sigreturn. So the correct fix seems to be to modify setcontext.S to mimic the kernel behavior. Seems reasonable? Paul Pluznikov sent me a patch to implement x86_64 specific getcontext that gets rid of the call to sigprocmask. I'll post it later today. -Arun
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