Set descriptors to restart a current syscall

If a task is sleep in syscall, it should be restared.
This logic is moved from kernel do_signal().

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

include/types.h

@@ -76,6 +76,11 @@
 
 #define SIGMAX			32
 
+#define ERESTARTSYS		512
+#define ERESTARTNOINTR		513
+#define ERESTARTNOHAND		514
+#define ERESTART_RESTARTBLOCK	516
+
 typedef uint64_t		u64;
 typedef int64_t			s64;
 typedef unsigned int		u32;