From 40a18d7f9a763a7d5d7fc3708741b52f7b55d0e3 Mon Sep 17 00:00:00 2001
From: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date: Fri, 13 Feb 2015 21:11:55 +0100
Subject: IMFS: Add CONFIGURE_IMFS_DISABLE_MKNOD_FILE

---
 cpukit/sapi/include/confdefs.h           |  6 +++++-
 doc/user/conf.t                          | 26 ++++++++++++++++++++++++++
 testsuites/fstests/fsimfsconfig01/init.c |  8 ++++----
 3 files changed, 35 insertions(+), 5 deletions(-)

diff --git a/cpukit/sapi/include/confdefs.h b/cpukit/sapi/include/confdefs.h
index 0cf7228ed2..ccc1ded435 100644
--- a/cpukit/sapi/include/confdefs.h
+++ b/cpukit/sapi/include/confdefs.h
@@ -621,7 +621,11 @@ const rtems_libio_helper rtems_fs_init_helper =
       static const IMFS_mknod_controls _Configure_IMFS_mknod_controls = {
         &IMFS_mknod_control_directory,
         &IMFS_mknod_control_device,
-        &IMFS_mknod_control_memfile,
+        #ifdef CONFIGURE_IMFS_DISABLE_MKNOD_FILE
+          &IMFS_mknod_control_enosys,
+        #else
+          &IMFS_mknod_control_memfile,
+        #endif
         #if CONFIGURE_MAXIMUM_FIFOS > 0 || CONFIGURE_MAXIMUM_PIPES > 0
           &IMFS_mknod_control_fifo
         #else
diff --git a/doc/user/conf.t b/doc/user/conf.t
index 138d322994..64d37ad902 100644
--- a/doc/user/conf.t
+++ b/doc/user/conf.t
@@ -2972,6 +2972,32 @@ This is not defined by default.
 In case this configuration option is defined, then the support to make
 directories, devices, regular files and FIFOs is disabled in the root IMFS.
 
+@c
+@c === CONFIGURE_IMFS_DISABLE_MKNOD_FILE ===
+@c
+@subsection Disable Make Files Support of Root IMFS
+
+@findex CONFIGURE_IMFS_DISABLE_MKNOD_FILE
+
+@table @b
+@item CONSTANT:
+@code{CONFIGURE_IMFS_DISABLE_MKNOD_FILE}
+
+@item DATA TYPE:
+Boolean feature macro.
+
+@item RANGE:
+Defined or undefined.
+
+@item DEFAULT VALUE:
+This is not defined by default.
+
+@end table
+
+@subheading DESCRIPTION:
+In case this configuration option is defined, then the support to make regular
+files is disabled in the root IMFS.
+
 @c
 @c === CONFIGURE_IMFS_DISABLE_RMNOD ===
 @c
diff --git a/testsuites/fstests/fsimfsconfig01/init.c b/testsuites/fstests/fsimfsconfig01/init.c
index e14ca8d5d8..4132f52bb9 100644
--- a/testsuites/fstests/fsimfsconfig01/init.c
+++ b/testsuites/fstests/fsimfsconfig01/init.c
@@ -78,11 +78,10 @@ static void Init(rtems_task_argument arg)
   rv = mknod(dev, S_IFCHR | S_IRWXU, 0);
   rtems_test_assert(rv == 0);
 
+  errno = 0;
   fd = creat(file, S_IRWXU);
-  rtems_test_assert(fd == 3);
-
-  rv = close(fd);
-  rtems_test_assert(rv == 0);
+  rtems_test_assert(fd == -1);
+  rtems_test_assert(errno == ENOSYS);
 
   errno = 0;
   rv = mkfifo(fifo, S_IRWXU);
@@ -143,6 +142,7 @@ static void Init(rtems_task_argument arg)
 #define CONFIGURE_IMFS_DISABLE_MKNOD
 #endif
 
+#define CONFIGURE_IMFS_DISABLE_MKNOD_FILE
 #define CONFIGURE_IMFS_DISABLE_MOUNT
 #define CONFIGURE_IMFS_DISABLE_RENAME
 #define CONFIGURE_IMFS_DISABLE_RMNOD
-- 
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