25b92edd9f
apps/builtin/exec_builtin.c: Try posix_spawn if builtin apps do not have have an entry point.
apps/Application.mk: introduce MODULE config to simplify tristate(m)
apps/nsh: Change the nuttx shell module type to tristate
apps: Add loadable application support
script/mksymtab: Generate symbol table name by default
apps/builtin: Allow loadable applications can register with apps/builtin.
201 lines
6.3 KiB
C
201 lines
6.3 KiB
C
/****************************************************************************
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* examples/unionfs/unionfs_main.c
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <errno.h>
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#include <nuttx/drivers/ramdisk.h>
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#include <nuttx/fs/unionfs.h>
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#include "romfs_atestdir.h"
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#include "romfs_btestdir.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration settings */
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#ifdef CONFIG_DISABLE_MOUNTPOINT
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# error "Mountpoint support is disabled"
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#endif
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#if CONFIG_NFILE_DESCRIPTORS < 4
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# error "Not enough file descriptors"
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#endif
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#ifndef CONFIG_FS_ROMFS
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# error "ROMFS support not enabled"
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#endif
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#ifndef CONFIG_FS_UNIONFS
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# error "Union File System support not enabled"
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#endif
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#ifndef CONFIG_EXAMPLES_UNIONFS_RAMDEVNO_A
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# define CONFIG_EXAMPLES_UNIONFS_RAMDEVNO_A 1
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#endif
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#ifndef CONFIG_EXAMPLES_UNIONFS_RAMDEVNO_B
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# define CONFIG_EXAMPLES_UNIONFS_RAMDEVNO_B 2
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#endif
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#ifndef CONFIG_EXAMPLES_UNIONFS_SECTORSIZE
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# define CONFIG_EXAMPLES_UNIONFS_SECTORSIZE 64
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#endif
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#ifndef CONFIG_EXAMPLES_UNIONFS_MOUNTPT
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# define "/mnt/unionfs"
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#endif
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#ifndef CONFIG_EXAMPLES_UNIONFS_TMPA
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# define "/mnt/a"
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#endif
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#ifndef CONFIG_EXAMPLES_UNIONFS_TMPB
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# define "/mnt/b"
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#endif
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#define NSECTORS(b) (((b)+CONFIG_EXAMPLES_UNIONFS_SECTORSIZE-1)/CONFIG_EXAMPLES_UNIONFS_SECTORSIZE)
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#define STR_RAMDEVNO(m) #m
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#define MKMOUNT_DEVNAME(m) "/dev/ram" STR_RAMDEVNO(m)
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#define MOUNT_DEVNAME_A MKMOUNT_DEVNAME(CONFIG_EXAMPLES_UNIONFS_RAMDEVNO_A)
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#define MOUNT_DEVNAME_B MKMOUNT_DEVNAME(CONFIG_EXAMPLES_UNIONFS_RAMDEVNO_B)
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#define SCRATCHBUFFER_SIZE 1024
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/* Test directory stuff */
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#define WRITABLE_MODE (S_IWOTH|S_IWGRP|S_IWUSR)
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#define READABLE_MODE (S_IROTH|S_IRGRP|S_IRUSR)
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#define EXECUTABLE_MODE (S_IXOTH|S_IXGRP|S_IXUSR)
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#define DIRECTORY_MODE (S_IFDIR|READABLE_MODE|EXECUTABLE_MODE)
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#define FILE_MODE (S_IFREG|READABLE_MODE)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: unionfs_main
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****************************************************************************/
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#ifdef CONFIG_BUILD_LOADABLE
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int main(int argc, FAR char *argv[])
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#else
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int unionfs_main(int argc, char *argv[])
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#endif
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{
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int ret;
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/* Create a RAM disk for file system 1 */
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ret = romdisk_register(CONFIG_EXAMPLES_UNIONFS_RAMDEVNO_A, atestdir_img,
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NSECTORS(atestdir_img_len),
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CONFIG_EXAMPLES_UNIONFS_SECTORSIZE);
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if (ret < 0)
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{
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printf("ERROR: Failed to create file system 1 RAM disk\n");
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return EXIT_FAILURE;
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}
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/* Mount test file system 1 */
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printf("Mounting ROMFS file system 1 at target=%s with source=%s\n",
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CONFIG_EXAMPLES_UNIONFS_TMPA, MOUNT_DEVNAME_A);
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ret = mount(MOUNT_DEVNAME_A, CONFIG_EXAMPLES_UNIONFS_TMPA, "romfs",
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MS_RDONLY, NULL);
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if (ret < 0)
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{
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printf("ERROR: File system 1 mount failed: %d\n", errno);
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return EXIT_FAILURE;
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}
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/* Create a RAM disk for file system 2 */
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ret = romdisk_register(CONFIG_EXAMPLES_UNIONFS_RAMDEVNO_B, btestdir_img,
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NSECTORS(btestdir_img_len),
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CONFIG_EXAMPLES_UNIONFS_SECTORSIZE);
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if (ret < 0)
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{
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printf("ERROR: Failed to register file system 1: %d\n", ret);
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return EXIT_FAILURE;
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}
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/* Mount test file system 2 */
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printf("Mounting ROMFS file system 2 at target=%s with source=%s\n",
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CONFIG_EXAMPLES_UNIONFS_TMPB, MOUNT_DEVNAME_B);
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ret = mount(MOUNT_DEVNAME_B, CONFIG_EXAMPLES_UNIONFS_TMPB, "romfs",
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MS_RDONLY, NULL);
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if (ret < 0)
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{
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printf("ERROR: Failed to register file system 1: %d\n", ret);
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return EXIT_FAILURE;
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}
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/* Now create and mount the union file system */
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ret = unionfs_mount(CONFIG_EXAMPLES_UNIONFS_TMPA, NULL,
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CONFIG_EXAMPLES_UNIONFS_TMPB, "offset",
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CONFIG_EXAMPLES_UNIONFS_MOUNTPT);
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if (ret < 0)
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{
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printf("ERROR: Failed to create the union file system: %d\n", ret);
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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