1 files changed, 49 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/mmap_internal.h b/sysdeps/unix/sysv/linux/mmap_internal.h
new file mode 100644
index 0000000000..b0c683ae98
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/mmap_internal.h
@@ -0,0 +1,49 @@
+/* Common mmap definition for Linux implementation.
+   Copyright (C) 2017-2018 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
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef MMAP_INTERNAL_LINUX_H
+#define MMAP_INTERNAL_LINUX_H 1
+
+/* This is the minimum mmap2 unit size accept by the kernel.  An architecture
+   with multiple minimum page sizes (such as m68k) might define it as -1 and
+   thus it will queried at runtime.  */
+#ifndef MMAP2_PAGE_UNIT
+# define MMAP2_PAGE_UNIT 4096ULL
+#endif
+
+#if MMAP2_PAGE_UNIT == -1
+static uint64_t page_unit;
+# define MMAP_CHECK_PAGE_UNIT()			\
+  if (page_unit == 0)				\
+    page_unit = __getpagesize ();
+# undef MMAP2_PAGE_UNIT
+# define MMAP2_PAGE_UNIT page_unit
+#else
+# define MMAP_CHECK_PAGE_UNIT()
+#endif
+
+/* Do not accept offset not multiple of page size.  */
+#define MMAP_OFF_LOW_MASK  (MMAP2_PAGE_UNIT - 1)
+
+/* An architecture may override this.  */
+#ifndef MMAP_CALL
+# define MMAP_CALL(__nr, __addr, __len, __prot, __flags, __fd, __offset) \
+  INLINE_SYSCALL_CALL (__nr, __addr, __len, __prot, __flags, __fd, __offset)
+#endif
+
+#endif /* MMAP_INTERNAL_LINUX_H  */