Added a test of posix_spawn()

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5507 42af7a65-404d-4744-a932-0658087f49c3

8 files changed, 752 insertions, 0 deletions

diff --git a/apps/examples/posix_spawn/Kconfig b/apps/examples/posix_spawn/Kconfig
new file mode 100644
index 000000000..508065913
--- /dev/null
+++ b/apps/examples/posix_spawn/Kconfig
@@ -0,0 +1,29 @@
+#
+# For a description of the syntax of this configuration file,
+# see misc/tools/kconfig-language.txt.
+#
+
+config EXAMPLES_POSIXSPAWN
+	bool "posix_spawn Unit Test"
+	default n
+	---help---
+		Enable the posix_spawn() unit test
+
+if EXAMPLES_POSIXSPAWN
+config EXAMPLES_POSIXSPAWN_DEVMINOR
+	int "ROMFS Minor Device Number"
+	default 0
+	---help---
+		The minor device number of the ROMFS block. For example, the N in /dev/ramN.
+		Used for registering the RAM block driver that will hold the ROMFS file system
+		containing the ELF executables to be tested.  Default: 0
+
+config EXAMPLES_POSIXSPAWN_DEVPATH
+	string "ROMFS Devie Path"
+	default "/dev/ram0"
+	---help---
+		The path to the ROMFS block driver device.  This must match EXAMPLES_POSIXSPAWN_DEVMINOR.
+		Used for registering the RAM block driver that will hold the ROMFS file system
+		containing the ELF executables to be tested.  Default: "/dev/ram0"
+
+endif
diff --git a/apps/examples/posix_spawn/Makefile b/apps/examples/posix_spawn/Makefile
new file mode 100644
index 000000000..d21c8f856
--- /dev/null
+++ b/apps/examples/posix_spawn/Makefile
@@ -0,0 +1,110 @@
+############################################################################
+# apps/examples/posix_spawn/Makefile
+#
+#   Copyright (C) 2013 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
+include $(APPDIR)/Make.defs
+
+# ELF Example
+
+ASRCS =
+CSRCS = spawn_main.c symtab.c
+
+AOBJS = $(ASRCS:.S=$(OBJEXT))
+COBJS = $(CSRCS:.c=$(OBJEXT))
+
+SRCS = $(ASRCS) $(CSRCS)
+OBJS = $(AOBJS) $(COBJS)
+
+ifeq ($(CONFIG_WINDOWS_NATIVE),y)
+  BIN		= ..\..\libapps$(LIBEXT)
+else
+ifeq ($(WINTOOL),y)
+  BIN		= ..\\..\\libapps$(LIBEXT)
+else
+  BIN		= ../../libapps$(LIBEXT)
+endif
+endif
+
+ROOTDEPPATH	= --dep-path . --dep-path filesystem
+
+# Build targets
+
+VPATH = filesystem
+
+all: .built
+.PHONY: really_build clean_filesystem clean depend distclean
+
+$(AOBJS): %$(OBJEXT): %.S
+	$(call ASSEMBLE, $<, $@)
+
+$(COBJS): %$(OBJEXT): %.c
+	$(call COMPILE, $<, $@)
+
+# This is a little messy.  The build is broken into two pieces:  (1) the
+# filesystem/ subdir build that auto-generates several files, and (2) the real
+# build.  This is done because we need a fresh build context after auto-
+# generating the source files.
+
+really_build: $(OBJS)
+	$(call ARCHIVE, $(BIN), $(OBJS))
+	@touch .built
+
+.built:
+	@$(MAKE) -C filesystem TOPDIR="$(TOPDIR)" APPDIR="$(APPDIR)" CROSSDEV=$(CROSSDEV)
+	@$(MAKE) TOPDIR="$(TOPDIR)" APPDIR="$(APPDIR)" really_build
+
+context:
+
+# We can't make dependencies in this directory because the required
+# header files may not yet exist.
+
+.depend:
+	@touch $@
+
+depend: .depend
+
+clean_filesystem:
+	@$(MAKE) -C filesystem TOPDIR="$(TOPDIR)" APPDIR="$(APPDIR)" CROSSDEV=$(CROSSDEV) clean
+
+clean: clean_filesystem
+	$(call DELFILE, .built)
+	$(call CLEAN)
+
+distclean: clean
+	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
+
+-include Make.dep
diff --git a/apps/examples/posix_spawn/filesystem/Makefile b/apps/examples/posix_spawn/filesystem/Makefile
new file mode 100644
index 000000000..19a02bb80
--- /dev/null
+++ b/apps/examples/posix_spawn/filesystem/Makefile
@@ -0,0 +1,85 @@
+############################################################################
+# apps/examples/posix_spawn/filesystem/Makefile
+#
+#   Copyright (C) 2013 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)/Make.defs
+include $(APPDIR)$(DELIM)Make.defs
+
+SPAWN_DIR = $(APPDIR)$(DELIM)examples$(DELIM)posix_spawn
+FILESYSTEM_DIR = $(SPAWN_DIR)$(DELIM)filesystem
+ROMFS_DIR = $(FILESYSTEM_DIR)$(DELIM)romfs
+ROMFS_IMG = $(FILESYSTEM_DIR)$(DELIM)romfs.img
+ROMFS_HDR = $(FILESYSTEM_DIR)$(DELIM)romfs.h
+SYMTAB_SRC = $(FILESYSTEM_DIR)$(DELIM)symtab.c
+
+all: $(ROMFS_HDR) $(SYMTAB_SRC)
+.PHONY: all program clean install populate
+
+# Create the romfs directory
+
+$(ROMFS_DIR):
+	$(Q) mkdir $(ROMFS_DIR)
+
+# Build the test program
+
+program: $(ROMFS_DIR)
+	$(Q) $(MAKE) -C program program TOPDIR="$(TOPDIR)" APPDIR="$(APPDIR)" ROMFS_DIR="$(ROMFS_DIR)"
+
+# Install the test program in the romfs directory
+
+install: program testdata.txt
+	$(Q) $(MAKE) -C program install TOPDIR="$(TOPDIR)" APPDIR="$(APPDIR)" ROMFS_DIR="$(ROMFS_DIR)"
+	$(Q) install --mode=0644 testdata.txt $(ROMFS_DIR)/testdata.txt
+
+# Create the romfs.img file from the romfs directory
+
+$(ROMFS_IMG): install
+	$(Q) genromfs -f $@ -d $(ROMFS_DIR) -V "POSIXSPAWN"
+
+# Create the romfs.h header file from the romfs.img file
+
+$(ROMFS_HDR) : $(ROMFS_IMG)
+	$(Q) (cd $(FILESYSTEM_DIR); xxd -i romfs.img | sed -e "s/^unsigned/static const unsigned/g" >$@)
+
+# Create the exported symbol table
+
+$(SYMTAB_SRC): program
+	$(Q) $(FILESYSTEM_DIR)$(DELIM)mksymtab.sh $(ROMFS_DIR) >$@
+
+# Clean each subdirectory
+
+clean:
+	$(Q) $(MAKE) -C program clean TOPDIR="$(TOPDIR)" APPDIR="$(APPDIR)" ROMFS_DIR="$(ROMFS_DIR)"
+	$(Q) rm -f $(ROMFS_HDR) $(ROMFS_IMG) $(SYMTAB_SRC)
+	$(Q) rm -rf $(ROMFS_DIR)
diff --git a/apps/examples/posix_spawn/filesystem/mksymtab.sh b/apps/examples/posix_spawn/filesystem/mksymtab.sh
new file mode 100755
index 000000000..51408a89c
--- /dev/null
+++ b/apps/examples/posix_spawn/filesystem/mksymtab.sh
@@ -0,0 +1,51 @@
+#!/bin/bash
+
+usage="Usage: $0 <test-dir-path>"
+
+# Check for the required ROMFS directory path
+
+dir=$1
+if [ -z "$dir" ]; then
+	echo "ERROR: Missing <test-dir-path>"
+	echo ""
+	echo $usage
+	exit 1
+fi
+
+if [ ! -d "$dir" ]; then
+	echo "ERROR: Directory $dir does not exist"
+	echo ""
+	echo $usage
+	exit 1
+fi
+
+# Extract all of the undefined symbols from the ELF files and create a
+# list of sorted, unique undefined variable names.
+
+varlist=`find ${dir} -executable -type f | xargs nm | fgrep ' U ' | sed -e "s/^[ ]*//g" | cut -d' ' -f2 | sort | uniq`
+
+# Now output the symbol table as a structure in a C source file.  All
+# undefined symbols are declared as void* types.  If the toolchain does
+# any kind of checking for function vs. data objects, then this could
+# faile
+
+echo "#include <nuttx/compiler.h>"
+echo "#include <nuttx/binfmt/symtab.h>"
+echo ""
+
+for var in $varlist; do
+	echo "extern void *${var};"
+done
+
+echo ""
+echo "const struct symtab_s exports[] = "
+echo "{"
+
+for var in $varlist; do
+	echo "  {\"${var}\", &${var}},"
+done
+
+echo "};"
+echo ""
+echo "const int nexports = sizeof(exports) / sizeof(struct symtab_s);"
+
diff --git a/apps/examples/posix_spawn/filesystem/program/Makefile b/apps/examples/posix_spawn/filesystem/program/Makefile
new file mode 100644
index 000000000..cf55797b2
--- /dev/null
+++ b/apps/examples/posix_spawn/filesystem/program/Makefile
@@ -0,0 +1,59 @@
+############################################################################
+# examples/posix_spawn/filesystem/program/Makefile
+#
+#   Copyright (C) 2013 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)/Make.defs
+
+BIN = program
+
+SRCS = $(BIN).c
+OBJS = $(SRCS:.c=.o)
+
+all: $(BIN)
+
+$(OBJS): %.o: %.c
+	@echo "CC: $<"
+	$(Q) $(CC) -c $(CELFFLAGS) $< -o $@
+
+$(BIN): $(OBJS)
+	@echo "LD: $<"
+	$(Q) $(LD) $(LDELFFLAGS) -o $@ $^
+
+clean: 
+	$(call DELFILE, $(BIN))
+	$(call CLEAN)
+
+install:
+	$(Q) mkdir -p $(ROMFS_DIR)
+	$(Q) install --mode=0755 $(BIN) $(ROMFS_DIR)/$(BIN)
diff --git a/apps/examples/posix_spawn/filesystem/program/program.c b/apps/examples/posix_spawn/filesystem/program/program.c
new file mode 100644
index 000000000..f63b559c8
--- /dev/null
+++ b/apps/examples/posix_spawn/filesystem/program/program.c
@@ -0,0 +1,60 @@
+/****************************************************************************
+ * examples/posix_spawn/filesystem/program/program.c
+ *
+ *   Copyright (C) 2013 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>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+int main(int argc, char **argv)
+{
+  int ch;
+
+  /* stdin should have been redirected to testdata.txt.  Read and print until
+   * we hit the end of file.
+   */
+
+  while ((ch = getchar()) != EOF)
+    {
+      putchar(ch);
+    }
+
+  return 0;
+}
diff --git a/apps/examples/posix_spawn/filesystem/testdata.txt b/apps/examples/posix_spawn/filesystem/testdata.txt
new file mode 100644
index 000000000..bb581fbb5
--- /dev/null
+++ b/apps/examples/posix_spawn/filesystem/testdata.txt
@@ -0,0 +1,2 @@
+Now is the time for all good men to come to the aid of their party.
+
diff --git a/apps/examples/posix_spawn/spawn_main.c b/apps/examples/posix_spawn/spawn_main.c
new file mode 100644
index 000000000..3e3a7b1b1
--- /dev/null
+++ b/apps/examples/posix_spawn/spawn_main.c
@@ -0,0 +1,356 @@
+/****************************************************************************
+ * examples/posix_spawn/spawn_main.c
+ *
+ *   Copyright (C) 2013 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 <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <sys/mount.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <spawn.h>
+#include <debug.h>
+#include <errno.h>
+
+#include <nuttx/ramdisk.h>
+#include <nuttx/binfmt/elf.h>
+#include <nuttx/binfmt/symtab.h>
+
+#include "filesystem/romfs.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/* Check configuration.  This is not all of the configuration settings that
+ * are required -- only the more obvious.
+ */
+
+#if CONFIG_NFILE_DESCRIPTORS < 1
+#  error "You must provide file descriptors via CONFIG_NFILE_DESCRIPTORS in your configuration file"
+#endif
+
+#ifdef CONFIG_BINFMT_DISABLE
+#  error "The binary loader is disabled (CONFIG_BINFMT_DISABLE)!"
+#endif
+
+#ifndef CONFIG_ELF
+#  error "You must select CONFIG_ELF in your configuration file"
+#endif
+
+#ifndef CONFIG_FS_ROMFS
+#  error "You must select CONFIG_FS_ROMFS in your configuration file"
+#endif
+
+#ifdef CONFIG_DISABLE_MOUNTPOINT
+#  error "You must not disable mountpoints via CONFIG_DISABLE_MOUNTPOINT in your configuration file"
+#endif
+
+#ifdef CONFIG_BINFMT_DISABLE
+#  error "You must not disable loadable modules via CONFIG_BINFMT_DISABLE in your configuration file"
+#endif
+
+/* Describe the ROMFS file system */
+
+#define SECTORSIZE   512
+#define NSECTORS(b)  (((b)+SECTORSIZE-1)/SECTORSIZE)
+#define MOUNTPT      "/mnt/romfs"
+
+#ifndef CONFIG_EXAMPLES_ELF_DEVMINOR
+#  define CONFIG_EXAMPLES_ELF_DEVMINOR 0
+#endif
+
+#ifndef CONFIG_EXAMPLES_ELF_DEVPATH
+#  define CONFIG_EXAMPLES_ELF_DEVPATH "/dev/ram0"
+#endif
+
+/* If CONFIG_DEBUG is enabled, use dbg instead of printf so that the
+ * output will be synchronous with the debug output.
+ */
+
+#ifdef CONFIG_CPP_HAVE_VARARGS
+#  ifdef CONFIG_DEBUG
+#    define message(format, arg...) dbg(format, ##arg)
+#    define err(format, arg...)     dbg(format, ##arg)
+#  else
+#    define message(format, arg...) printf(format, ##arg)
+#    define err(format, arg...)     fprintf(stderr, format, ##arg)
+#  endif
+#else
+#  ifdef CONFIG_DEBUG
+#    define message                 dbg
+#    define err                     dbg
+#  else
+#    define message                 printf
+#    define err                     printf
+#  endif
+#endif
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static unsigned int g_mminitial;  /* Initial memory usage */
+static unsigned int g_mmstep;     /* Memory Usage at beginning of test step */
+
+static const char delimiter[] =
+  "****************************************************************************";
+static const char program[] = "program";
+static const char data[]    = "testdata.txt";
+
+static char fullpath[128];
+
+/****************************************************************************
+ * Symbols from Auto-Generated Code
+ ****************************************************************************/
+
+extern const struct symtab_s exports[];
+extern const int nexports;
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: mm_update
+ ****************************************************************************/
+
+static void mm_update(FAR unsigned int *previous, FAR const char *msg)
+{
+  struct mallinfo mmcurrent;
+
+  /* Get the current memory usage */
+
+#ifdef CONFIG_CAN_PASS_STRUCTS
+  mmcurrent = mallinfo();
+#else
+  (void)mallinfo(&mmcurrent);
+#endif
+
+  /* Show the change from the previous time */
+
+  printf("\nMemory Usage %s:\n", msg);
+  printf("  Before: %8u After: %8u Change: %8d\n",
+         *previous, mmcurrent.uordblks, (int)mmcurrent.uordblks - (int)*previous);
+
+  /* Set up for the next test */
+
+  *previous =  mmcurrent.uordblks;
+}
+
+/****************************************************************************
+ * Name: mm_initmonitor
+ ****************************************************************************/
+
+static void mm_initmonitor(void)
+{
+  struct mallinfo mmcurrent;
+
+#ifdef CONFIG_CAN_PASS_STRUCTS
+  mmcurrent = mallinfo();
+#else
+  (void)mallinfo(&mmcurrent);
+#endif
+
+  g_mminitial = mmcurrent.uordblks;
+  g_mmstep    = mmcurrent.uordblks;
+
+  printf("Initial memory usage: %d\n", mmcurrent.uordblks);
+}
+
+/****************************************************************************
+ * Name: testheader
+ ****************************************************************************/
+
+static inline void testheader(FAR const char *progname)
+{
+  message("\n%s\n* Executing %s\n%s\n\n", delimiter, progname, delimiter);
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: spawn_main
+ ****************************************************************************/
+
+int spawn_main(int argc, char *argv[])
+{
+  posix_spawn_file_actions_t file_actions;
+  posix_spawnattr_t attr;
+  FAR const char *filepath;
+  pid_t pid;
+  int ret;
+
+  /* Initialize the memory monitor */
+
+  mm_initmonitor();
+
+  /* Initialize the ELF binary loader */
+
+  message("Initializing the ELF binary loader\n");
+  ret = elf_initialize();
+  if (ret < 0)
+    {
+      err("ERROR: Initialization of the ELF loader failed: %d\n", ret);
+      exit(1);
+    }
+
+  mm_update(&g_mmstep, "after elf_initialize");
+
+  /* Create a ROM disk for the ROMFS filesystem */
+
+  message("Registering romdisk at /dev/ram%d\n", CONFIG_EXAMPLES_ELF_DEVMINOR);
+  ret = romdisk_register(CONFIG_EXAMPLES_ELF_DEVMINOR, (FAR uint8_t *)romfs_img,
+                         NSECTORS(romfs_img_len), SECTORSIZE);
+  if (ret < 0)
+    {
+      err("ERROR: romdisk_register failed: %d\n", ret);
+      elf_uninitialize();
+      exit(1);
+    }
+
+  mm_update(&g_mmstep, "after romdisk_register");
+
+  /* Mount the file system */
+
+  message("Mounting ROMFS filesystem at target=%s with source=%s\n",
+         MOUNTPT, CONFIG_EXAMPLES_ELF_DEVPATH);
+
+  ret = mount(CONFIG_EXAMPLES_ELF_DEVPATH, MOUNTPT, "romfs", MS_RDONLY, NULL);
+  if (ret < 0)
+    {
+      err("ERROR: mount(%s,%s,romfs) failed: %s\n",
+          CONFIG_EXAMPLES_ELF_DEVPATH, MOUNTPT, errno);
+      elf_uninitialize();
+    }
+
+  mm_update(&g_mmstep, "after mount");
+
+  /* Does the system support the PATH variable?  Has the PATH variable
+   * already been set?  If YES and NO, then set the PATH variable to
+   * the ROMFS mountpoint.
+   */
+
+#if defined(CONFIG_BINFMT_EXEPATH) && !defined(CONFIG_PATH_INITIAL)
+  (void)setenv("PATH", MOUNTPT, 1);
+#endif
+
+  /* Make sure that we are using our symbol take */
+
+  exec_setsymtab(exports, nexports);
+
+  /* Output a seperated so that we can clearly discriminate the output of
+   * this program from the others.
+   */
+
+  testheader(program);
+
+  /* Initialize the attributes file actions structure */
+
+  ret = posix_spawn_file_actions_init(&file_actions);
+  if (ret != 0)
+    {
+      err("ERROR: posix_spawn_file_actions_init failed: %d\n", ret);
+    }
+
+  ret = posix_spawnattr_init(&attr);
+  if (ret != 0)
+    {
+      err("ERROR: posix_spawnattr_init failed: %d\n", ret);
+    }
+
+  /* Set up to close stdin (0) and open testdata.txt as the program input */
+
+  ret = posix_spawn_file_actions_addclose(&file_actions, 0);
+  if (ret != 0)
+    {
+      err("ERROR: posix_spawn_file_actions_addclose failed: %d\n", ret);
+    }
+
+  snprintf(fullpath, 128, "%s/%s", MOUNTPT, data);
+  ret = posix_spawn_file_actions_addopen(&file_actions, 0, fullpath, O_RDONLY, 0644);
+  if (ret != 0)
+    {
+      err("ERROR: posix_spawn_file_actions_addopen failed: %d\n", ret);
+    }
+  
+  /* If the binary loader does not support the PATH variable, then
+   * create the full path to the executable program.  Otherwise,
+   * use the relative path so that the binary loader will have to
+   * search the PATH variable to find the executable.
+   */
+
+#ifdef CONFIG_BINFMT_EXEPATH
+  filepath = program;
+#else
+  snprintf(fullpath, 128, "%s/%s", MOUNTPT, program);
+  filepath = fullpath;
+#endif
+
+  /* Execute the program */
+
+  mm_update(&g_mmstep, "before posix_spawn");
+
+  ret = posix_spawn(&pid, filepath, &file_actions, &attr, NULL, NULL);
+  if (ret != 0)
+    {
+      err("ERROR: posix_spawn failed: %d\n", ret);
+    }
+
+  sleep(1);
+  mm_update(&g_mmstep, "after posix_spawn");
+
+  /* Clean-up */
+
+  (void)posix_spawn_file_actions_destroy(&file_actions);
+  (void)posix_spawnattr_destroy(&attr);
+  elf_uninitialize();
+
+  mm_update(&g_mmstep, "End-of-Test");
+  return 0;
+}