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-rw-r--r--winsup/cygwin/include/sys/mman.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/winsup/cygwin/include/sys/mman.h b/winsup/cygwin/include/sys/mman.h
index 3264739c0..21bf6976d 100644
--- a/winsup/cygwin/include/sys/mman.h
+++ b/winsup/cygwin/include/sys/mman.h
@@ -30,6 +30,9 @@ extern "C" {
#define MAP_FIXED 0x10
#define MAP_ANONYMOUS 0x20
#define MAP_ANON MAP_ANONYMOUS
+/* Non-standard flag */
+#define MAP_AUTOGROW 0x8000 /* Grow underlying object to mapping size.
+ File must be opened for writing. */
#define MAP_FAILED ((void *)-1)