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-rw-r--r--winsup/cygwin/include/sys/mman.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/winsup/cygwin/include/sys/mman.h b/winsup/cygwin/include/sys/mman.h
index 9f36bc323..244dcdb39 100644
--- a/winsup/cygwin/include/sys/mman.h
+++ b/winsup/cygwin/include/sys/mman.h
@@ -21,6 +21,8 @@ extern "C" {
#define MAP_ANONYMOUS 0x20
#define MAP_ANON MAP_ANONYMOUS
+#define MAP_FAILED ((caddr_t)-1)
+
/*
* Flags for msync.
*/