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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