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-rw-r--r--sysdeps/unix/sysv/linux/bits/mman-shared.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/bits/mman-shared.h b/sysdeps/unix/sysv/linux/bits/mman-shared.h
index d016086c7e..64f1d65117 100644
--- a/sysdeps/unix/sysv/linux/bits/mman-shared.h
+++ b/sysdeps/unix/sysv/linux/bits/mman-shared.h
@@ -24,6 +24,7 @@
 /* Flags for mremap.  */
 # define MREMAP_MAYMOVE	1
 # define MREMAP_FIXED	2
+# define MREMAP_DONTUNMAP 4
 
 /* Flags for memfd_create.  */
 # ifndef MFD_CLOEXEC