Add an example for testing the ELF loader

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5260 42af7a65-404d-4744-a932-0658087f49c3

apps/examples/elf/tests/errno/Makefile

@@ -0,0 +1,59 @@
+############################################################################
+# examples/elf/tests/hello/Makefile
+#
+#   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+-include $(TOPDIR)/.config
+-include $(TOPDIR)/Make.defs
+
+BIN = errno
+
+SRCS = $(BIN).c
+OBJS = $(BIN:.c=.o)
+
+all: $(BIN)
+
+$(OBJS): %.o: %.c
+	@echo "CC: $<"
+	@$(CC) -c $(CFLAGS) $< -o $@
+
+$(BIN): $(OBJS)
+	@echo "LD: $<"
+	@$(LD) $(LDELFFLAGS) -o $@ $^
+
+clean: 
+	@rm -f $(BIN) *.o *~ .*.swp core
+
+install:
+	@install -D $(BIN) $(ROMFS_DIR)/$(BIN)
+

apps/examples/elf/tests/errno/errno.c

@@ -0,0 +1,83 @@
+/****************************************************************************
+ * examples/elf/tests/errno/errno.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+static const char g_nonexistent[] = "aflav-sautga-ay";
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+int main(int argc, char **argv)
+{
+  FILE *test_stream;
+
+  /* Try using stdout and stderr explicitly.  These are global variables
+   * exported from the base code.
+   */
+
+  fprintf(stdout, "Hello, World on stdout\n");
+  fprintf(stderr, "Hello, World on stderr\n");
+
+  /* Try opening a non-existent file using buffered IO. */
+
+  test_stream = fopen(g_nonexistent, "r");
+  if (test_stream)
+    {
+      fprintf(stderr, "Hmm... Delete \"%s\" and try this again\n",
+	      g_nonexistent);
+      exit(1);
+    }
+
+  /* Now print the errno on stderr.  Errno is also a global
+   * variable exported by the base code.
+   */
+
+  fprintf(stderr, "We failed to open \"%s!\" errno is %d\n",
+	  g_nonexistent, errno);
+
+  return 0;
+}