add SS_AUTODISARM sigaltstack ss_flags from linux v4.7 to signal.h

only matters if swapcontext is used in a signal handler running on an
altstack, new in linux commit 2a74213838104a41588d86fd5e8d344972891ace

diff --git a/include/signal.h b/include/signal.h
index a16094c515694068b06bac8d0093d8787026e7f2..2c8b3d5576044e63198ce345e532cefcfdf7d83c 100644 (file)
--- a/include/signal.h
+++ b/include/signal.h
@@ -239,6 +239,8 @@ void (*sigset(int, void (*)(int)))(int);
 #define POLL_HUP 6
 #define SS_ONSTACK    1
 #define SS_DISABLE    2
+#define SS_AUTODISARM (1U << 31)
+#define SS_FLAG_BITS SS_AUTODISARM
 #endif
 
 #if defined(_BSD_SOURCE) || defined(_GNU_SOURCE)