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-rw-r--r--bits/mman-linux.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/bits/mman-linux.h b/bits/mman-linux.h
index 9d0a9834c9..dbb994bf4d 100644
--- a/bits/mman-linux.h
+++ b/bits/mman-linux.h
@@ -108,4 +108,6 @@
 # define MCL_CURRENT	1		/* Lock all currently mapped pages.  */
 # define MCL_FUTURE	2		/* Lock all additions to address
 					   space.  */
+# define MCL_ONFAULT	4		/* Lock all pages that are
+					   faulted in.  */
 #endif