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+/****************************************************************************
+ * 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;
+}
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