* exceptions.cc (interruptible): Update debugging output.

(setup_handler): Ensure that wait_sig loop wakes up when we punt on sending a
signal.
* poll.cc (poll): Add signal guard here.

winsup/cygwin/poll.cc

@@ -15,6 +15,7 @@
 #include "fhandler.h"
 #include "dtable.h"
 #include "cygerrno.h"
+#include "sigproc.h"
 
 extern "C"
 int
@@ -23,6 +24,7 @@ poll (struct pollfd *fds, unsigned int nfds, int timeout)
   int max_fd = 0;
   fd_set *open_fds, *read_fds, *write_fds, *except_fds;
   struct timeval tv = { timeout / 1000, (timeout % 1000) * 1000 };
+  sigframe thisframe (mainthread);
 
   for (unsigned int i = 0; i < nfds; ++i)
     if (fds[i].fd > max_fd)