* debug.h: Add regparm attributes to some functions.

* signal.cc (sigaction): Don't treat SIGCONT specially.
* exceptions.cc (interrupt_setup): Save sa_flags of interrupted signal for
later use.
(sig_handler): Default any stopping signal to SIGSTOP.
(call_signal_handler): New function.
(sigdelayed0): New function.
* sigproc.cc (sigproc_init): Initialize SIGSTOP sigaction for special behavior.
* sigproc.h: Define call_signal_handler.
* syscalls.cc (_read): Allow restartable signal behavior.

winsup/cygwin/sigproc.cc

@@ -562,6 +562,7 @@ sigproc_init ()
     }
   memset (w, 0, sizeof *w);	// Just to be safe
 
+  myself->getsig (SIGSTOP).sa_flags = SA_RESTART | SA_NODEFER;
   sigproc_printf ("process/signal handling enabled(%x)", myself->process_state);
   return;
 }