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-rw-r--r--libio/libio.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/libio/libio.h b/libio/libio.h
index 11274aebb4..c70a86ae90 100644
--- a/libio/libio.h
+++ b/libio/libio.h
@@ -138,6 +138,7 @@
 #define _IO_USER_LOCK 0x8000
 
 #define _IO_FLAGS2_MMAP 1
+#define _IO_FLAGS2_NOTCANCEL 2
 
 /* These are "formatting flags" matching the iostream fmtflags enum values. */
 #define _IO_SKIPWS 01