libblock: PR2145: Limit maximum read-ahead blocks

This helps to prevent stack overflows due to configuration errors.

testsuites/libtests/Makefile.am

@@ -1,6 +1,7 @@
 ACLOCAL_AMFLAGS = -I ../aclocal
 
 SUBDIRS = POSIX
+SUBDIRS += block17
 SUBDIRS += exit02
 SUBDIRS += exit01
 SUBDIRS += utf8proc01

testsuites/libtests/block17/Makefile.am

@@ -0,0 +1,19 @@
+rtems_tests_PROGRAMS = block17
+block17_SOURCES = init.c
+
+dist_rtems_tests_DATA = block17.scn block17.doc
+
+include $(RTEMS_ROOT)/make/custom/@RTEMS_BSP@.cfg
+include $(top_srcdir)/../automake/compile.am
+include $(top_srcdir)/../automake/leaf.am
+
+AM_CPPFLAGS += -I$(top_srcdir)/../support/include
+
+LINK_OBJS = $(block17_OBJECTS)
+LINK_LIBS = $(block17_LDLIBS)
+
+block17$(EXEEXT): $(block17_OBJECTS) $(block17_DEPENDENCIES)
+	@rm -f block17$(EXEEXT)
+	$(make-exe)
+
+include $(top_srcdir)/../automake/local.am

testsuites/libtests/block17/block17.doc

@@ -0,0 +1,12 @@
+This file describes the directives and concepts tested by this test set.
+
+test set name: block17
+
+directives:
+
+  - rtems_bdbuf_init()
+
+concepts:
+
+  - Ensure that maximum read-ahead blocks count configuration error gets
+    detected.

testsuites/libtests/block17/block17.scn

@@ -0,0 +1,2 @@
+*** TEST BLOCK 17 ***
+*** END OF TEST BLOCK 17 ***

testsuites/libtests/block17/init.c

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2013 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Dornierstr. 4
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems@embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.com/license/LICENSE.
+ */
+
+#ifdef HAVE_CONFIG_H
+  #include "config.h"
+#endif
+
+#include <rtems/bdbuf.h>
+
+#include "tmacros.h"
+
+static void test(void)
+{
+  rtems_status_code sc = rtems_bdbuf_init();
+  rtems_test_assert(sc == RTEMS_INVALID_NUMBER);
+}
+
+static void Init(rtems_task_argument arg)
+{
+  puts("\n\n*** TEST BLOCK 17 ***");
+
+  test();
+
+  puts("*** END OF TEST BLOCK 17 ***");
+
+  rtems_test_exit(0);
+}
+
+#define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER
+#define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
+
+#define CONFIGURE_APPLICATION_NEEDS_LIBBLOCK
+#define CONFIGURE_BDBUF_MAX_READ_AHEAD_BLOCKS (64UL * 1024UL)
+
+#define CONFIGURE_USE_IMFS_AS_BASE_FILESYSTEM
+
+#define CONFIGURE_MAXIMUM_TASKS 1
+
+#define CONFIGURE_RTEMS_INIT_TASKS_TABLE
+
+#define CONFIGURE_INIT
+
+#include <rtems/confdefs.h>

testsuites/libtests/configure.ac

@@ -43,6 +43,7 @@ AM_CONDITIONAL(HAS_POSIX,test x"${rtems_cv_RTEMS_POSIX_API}" = x"yes")
 
 # Explicitly list all Makefiles here
 AC_CONFIG_FILES([Makefile
+block17/Makefile
 exit02/Makefile
 exit01/Makefile
 utf8proc01/Makefile