sync with glibc

libc/sysdeps/linux/x86_64/bits/fcntl.h

@@ -193,3 +193,11 @@ struct flock64
 # define POSIX_FADV_DONTNEED	4 /* Don't need these pages.  */
 # define POSIX_FADV_NOREUSE	5 /* Data will be accessed once.  */
 #endif
+
+__BEGIN_DECLS
+
+/* Provide kernel hint to read ahead.  */
+extern ssize_t readahead (int __fd, __off64_t __offset, size_t __count)
+    __THROW;
+
+__END_DECLS

libc/sysdeps/linux/x86_64/bits/mman.h

@@ -1,5 +1,5 @@
 /* Definitions for POSIX memory map interface.  Linux/x86_64 version.
-   Copyright (C) 2001, 2003 Free Software Foundation, Inc.
+   Copyright (C) 2001, 2003, 2005, 2006 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -89,6 +89,7 @@
 # define MADV_SEQUENTIAL 2	/* Expect sequential page references.  */
 # define MADV_WILLNEED	 3	/* Will need these pages.  */
 # define MADV_DONTNEED	 4	/* Don't need these pages.  */
+# define MADV_REMOVE	 5	/* Remove these pages and resources.  */
 #endif
 
 /* The POSIX people had to invent similar names for the same things.  */