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diff --git a/include/inn/mmap.h b/include/inn/mmap.h
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+/* $Id: mmap.h 7598 2007-02-09 02:40:51Z eagle $
+**
+** MMap manipulation routines
+**
+** Written by Alex Kiernan ([email protected])
+**
+** These routines work with mmap()ed memory
+*/
+
+#ifndef INN_MMAP_H
+#define INN_MMAP_H 1
+
+#include <inn/defines.h>
+
+BEGIN_DECLS
+
+/* Figure out what page an address is in and flush those pages. This is the
+ internal function, which we wrap with a define below. */
+void inn__mapcntl(void *, size_t, int);
+
+/* Some platforms only support two arguments to msync. On those platforms,
+ make the third argument to mapcntl always be zero, getting rid of whatever
+ the caller tried to pass. This avoids undefined symbols for MS_ASYNC and
+ friends on platforms with two-argument msync functions. */
+#ifdef INN_HAVE_MSYNC_3_ARG
+# define inn_mapcntl inn__mapcntl
+#else
+# define inn_mapcntl(p, l, f) inn__mapcntl((p), (l), 0)
+#endif
+
+END_DECLS
+
+#endif /* INN_MMAP_H */