posix: Add mmap/unmap support for mapping files.

This version of mmap comes from early work done
on the RTL code base circa 2012.

Update #2859.

1 files changed, 44 insertions, 0 deletions

diff --git a/cpukit/posix/include/rtems/posix/mmanimpl.h b/cpukit/posix/include/rtems/posix/mmanimpl.h
new file mode 100644
index 0000000000..9743685a57
--- /dev/null
+++ b/cpukit/posix/include/rtems/posix/mmanimpl.h
@@ -0,0 +1,44 @@
+/**
+ * @file
+ *
+ * @brief Internal Support for POSIX 1003.1b 6.3.1 - map pages of memory
+ *
+ */
+
+/*
+ * Copyright (c) 2012 Chris Johns
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#ifndef _RTEMS_POSIX_MMANIMPL_H
+#define _RTEMS_POSIX_MMANIMPL_H
+
+#include <rtems/chain.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Every mmap'ed region has a mapping.
+ */
+typedef struct mmap_mappings_s {
+  rtems_chain_node node;  /**< The mapping chain's node */
+  void*            addr;  /**< The address of the mapped memory */
+  size_t           len;   /**< The length of memory mapped */
+  int              flags; /**< The mapping flags */
+} mmap_mapping;
+
+extern rtems_chain_control mmap_mappings;
+
+bool mmap_mappings_lock_obtain( void );
+bool mmap_mappings_lock_release( void );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif