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Only construct ucontext for SA_SIGINFO signal handlers 

* exceptions.cc (call_signal_handler): Only bother to construct
	the ucontext for signal handlers with SA_SIGINFO set.  Set
	mcontext.oldmask.

Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
This commit is contained in:
Jon TURNEY 2015-04-02 18:15:07 +01:00 committed by Corinna Vinschen
parent 65c071bc4d
commit 9043956ce8
2 changed files with 38 additions and 22 deletions
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6
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,9 @@
2015-04-02 Jon TURNEY <jon.turney@dronecode.org.uk>
* exceptions.cc (call_signal_handler): Only bother to construct
the ucontext for signal handlers with SA_SIGINFO set. Set
mcontext.oldmask.
2015-04-04 Jon TURNEY <jon.turney@dronecode.org.uk>
* exceptions.cc (call_signal_handler): Zero initialize context and set

54
winsup/cygwin/exceptions.cc
View File

@ -1485,42 +1485,52 @@ _cygtls::call_signal_handler ()
debug_only_printf ("dealing with signal %d", sig);
this_sa_flags = sa_flags;
sigset_t this_oldmask = set_process_mask_delta ();
/* Save information locally on stack to pass to handler. */
int thissig = sig;
siginfo_t thissi = infodata;
void (*thisfunc) (int, siginfo_t *, void *) = func;
ucontext_t thiscontext;
thiscontext.uc_link = 0;
thiscontext.uc_flags = 0;
if (thissi.si_cyg)
memcpy (&thiscontext.uc_mcontext, ((cygwin_exception *)thissi.si_cyg)->context(), sizeof(CONTEXT));
else
ucontext_t context;
ucontext_t *thiscontext = NULL;
/* Only make a context for SA_SIGINFO handlers */
if (this_sa_flags & SA_SIGINFO)
{
/* FIXME: Really this should be the context which the signal interrupted? */
memset(&thiscontext.uc_mcontext, 0, sizeof(struct __mcontext));
thiscontext.uc_mcontext.ctxflags = CONTEXT_FULL;
RtlCaptureContext ((CONTEXT *)&thiscontext.uc_mcontext);
context.uc_link = 0;
context.uc_flags = 0;
if (thissi.si_cyg)
memcpy (&context.uc_mcontext, ((cygwin_exception *)thissi.si_cyg)->context(), sizeof(CONTEXT));
else
{
/* FIXME: Really this should be the context which the signal interrupted? */
memset(&context.uc_mcontext, 0, sizeof(struct __mcontext));
context.uc_mcontext.ctxflags = CONTEXT_FULL;
RtlCaptureContext ((CONTEXT *)&context.uc_mcontext);
}
/* FIXME: If/when sigaltstack is implemented, this will need to do
something more complicated */
context.uc_stack.ss_sp = NtCurrentTeb ()->Tib.StackBase;
context.uc_stack.ss_flags = 0;
if (!NtCurrentTeb ()->DeallocationStack)
context.uc_stack.ss_size = (uintptr_t)NtCurrentTeb ()->Tib.StackLimit - (uintptr_t)NtCurrentTeb ()->Tib.StackBase;
else
context.uc_stack.ss_size = (uintptr_t)NtCurrentTeb ()->DeallocationStack - (uintptr_t)NtCurrentTeb ()->Tib.StackBase;
context.uc_sigmask = context.uc_mcontext.oldmask = this_oldmask;
thiscontext = &context;
}
/* FIXME: If/when sigaltstack is implemented, this will need to do
something more complicated */
thiscontext.uc_stack.ss_sp = NtCurrentTeb ()->Tib.StackBase;
thiscontext.uc_stack.ss_flags = 0;
if (!NtCurrentTeb ()->DeallocationStack)
thiscontext.uc_stack.ss_size = (uintptr_t)NtCurrentTeb ()->Tib.StackLimit - (uintptr_t)NtCurrentTeb ()->Tib.StackBase;
else
thiscontext.uc_stack.ss_size = (uintptr_t)NtCurrentTeb ()->DeallocationStack - (uintptr_t)NtCurrentTeb ()->Tib.StackBase;
sigset_t this_oldmask = set_process_mask_delta ();
thiscontext.uc_sigmask = this_oldmask;
int this_errno = saved_errno;
reset_signal_arrived ();
incyg = false;
sig = 0; /* Flag that we can accept another signal */
unlock (); /* unlock signal stack */
thisfunc (thissig, &thissi, &thiscontext);
thisfunc (thissig, &thissi, thiscontext);
incyg = true;
set_signal_mask (_my_tls.sigmask, this_oldmask);