[PATCH 1/3] Initialize context before RtlContextCapture

[Jon TURNEY <jon.turney@dronecode.org.uk>]

	* exceptions.cc (call_signal_handler): Zero initialize context and set
	context flags, as RlCaptureContext doesn't.

Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
---
 winsup/cygwin/ChangeLog     | 5 +++++
 winsup/cygwin/exceptions.cc | 8 ++++++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/winsup/cygwin/exceptions.cc b/winsup/cygwin/exceptions.cc
index 0d1f36d..9d50c1e 100644
--- a/winsup/cygwin/exceptions.cc
+++ b/winsup/cygwin/exceptions.cc
@@ -1496,8 +1496,12 @@ _cygtls::call_signal_handler ()
       if (thissi.si_cyg)
         memcpy (&thiscontext.uc_mcontext, ((cygwin_exception *)thissi.si_cyg)->context(), sizeof(CONTEXT));
       else
-        RtlCaptureContext ((CONTEXT *)&thiscontext.uc_mcontext);
-        /* FIXME: Really this should be the context which the signal interrupted? */
+        {
+          /* 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);
+        }
 
       /* FIXME: If/when sigaltstack is implemented, this will need to do
          something more complicated */
-- 
2.1.4