posix/mmap: Add support for file handler and MAP_ANON

Added a mmap file handler to struct _rtems_filesystem_file_handlers_r.
Updated each file handler object to support the default mmap handler.
Updated mmap() to call the mmap handler for MAP_SHARED.
Added a mmap file handler for shm

Added support for MAP_ANON in mmap().

Updates #2859

2 files changed, 41 insertions, 0 deletions

diff --git a/cpukit/libfs/src/defaults/default_handlers.c b/cpukit/libfs/src/defaults/default_handlers.c
index 903cddc7f3..3730f6c283 100644
--- a/cpukit/libfs/src/defaults/default_handlers.c
+++ b/cpukit/libfs/src/defaults/default_handlers.c
@@ -34,6 +34,7 @@ const rtems_filesystem_file_handlers_r rtems_filesystem_handlers_default = {
   .fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync,
   .fcntl_h = rtems_filesystem_default_fcntl,
   .kqfilter_h = rtems_filesystem_default_kqfilter,
+  .mmap_h = rtems_filesystem_default_mmap,
   .poll_h = rtems_filesystem_default_poll,
   .readv_h = rtems_filesystem_default_readv,
   .writev_h = rtems_filesystem_default_writev
diff --git a/cpukit/libfs/src/defaults/default_mmap.c b/cpukit/libfs/src/defaults/default_mmap.c
new file mode 100644
index 0000000000..08534eef31
--- /dev/null
+++ b/cpukit/libfs/src/defaults/default_mmap.c
@@ -0,0 +1,40 @@
+/**
+ * @file
+ *
+ * @brief Default MMAP Handler
+ *
+ * @ingroup LibIOFSHandler
+ */
+
+/*
+ * Copyright (c) 2017 Kevin Kirspel (kirspkt@gmail.com)
+ *
+ *  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.
+ */
+
+#if HAVE_CONFIG_H
+  #include "config.h"
+#endif
+
+#include <rtems/libio_.h>
+
+int rtems_filesystem_default_mmap(
+  rtems_libio_t  *iop,
+  void          **addr,
+  size_t          len,
+  int             prot,
+  off_t           off
+)
+{
+  rtems_set_errno_and_return_minus_one( ENOTSUP );
+}
+
+int rtems_termios_mmap(
+  rtems_libio_t  *iop,
+  void          **addr,
+  size_t          len,
+  int             prot,
+  off_t           off
+) RTEMS_WEAK_ALIAS( rtems_filesystem_default_mmap );