/****************************************************************************
* examples/module/module_main.c
*
* Copyright (C) 2015, 2017-2018 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 <sys/stat.h>
#include <sys/boardctl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <syslog.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/module.h>
#include <nuttx/symtab.h>
#if defined(CONFIG_EXAMPLES_MODULE_ROMFS)
# include <nuttx/drivers/ramdisk.h>
#endif
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Check configuration. This is not all of the configuration settings that
* are required -- only the more obvious.
*/
#ifndef CONFIG_MODULE
# error "You must select CONFIG_MODULE in your configuration file"
#endif
#if defined(CONFIG_EXAMPLES_MODULE_BUILTINFS)
# if !defined(CONFIG_FS_ROMFS) && !defined(CONFIG_FS_CROMFS)
# error "You must select CONFIG_FS_ROMFS or CONFIG_FS_CROMFS in your configuration file"
# endif
# ifdef CONFIG_DISABLE_MOUNTPOINT
# error "You must not disable mountpoints via CONFIG_DISABLE_MOUNTPOINT in your configuration file"
# endif
# if defined(CONFIG_EXAMPLES_MODULE_ROMFS)
/* Describe the ROMFS file system */
# define SECTORSIZE 64
# define NSECTORS(b) (((b)+SECTORSIZE-1)/SECTORSIZE)
# define MOUNTPT "/mnt/romfs"
# ifndef CONFIG_EXAMPLES_MODULE_DEVMINOR
# define CONFIG_EXAMPLES_MODULE_DEVMINOR 0
# endif
# ifndef CONFIG_EXAMPLES_MODULE_DEVPATH
# define CONFIG_EXAMPLES_MODULE_DEVPATH "/dev/ram0"
# endif
# elif defined(CONFIG_EXAMPLES_MODULE_CROMFS)
/* Describe the CROMFS file system */
# define MOUNTPT "/mnt/cromfs"
# endif
# define BINDIR MOUNTPT
#elif defined(CONFIG_EXAMPLES_MODULE_FSMOUNT)
/* Describe how to auto-mount the external file system */
# define MOUNTPT "/mnt/" CONFIG_EXAMPLES_MODULE_FSTYPE
# define BINDIR MOUNTPT
#else
/* Describe how to use the pre-mounted external file system */
# define BINDIR CONFIG_EXAMPLES_MODULE_BINDIR
#endif /* CONFIG_EXAMPLES_MODULE_BUILTINFS */
/****************************************************************************
* Private data
****************************************************************************/
static const char g_write_string[] = "Hi there installed driver\n";
/****************************************************************************
* Symbols from Auto-Generated Code
****************************************************************************/
#if defined(CONFIG_EXAMPLES_MODULE_ROMFS) || defined(CONFIG_EXAMPLES_MODULE_CROMFS)
extern const unsigned char romfs_img[];
extern const unsigned int romfs_img_len;
#endif
#ifdef CONFIG_BUILD_FLAT
extern const struct symtab_s g_mod_exports[];
extern const int g_mod_nexports;
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: module_main
****************************************************************************/
int main(int argc, FAR char *argv[])
{
#ifdef CONFIG_BUILD_FLAT
struct boardioc_symtab_s symdesc;
#endif
#if defined(CONFIG_EXAMPLES_MODULE_FSMOUNT) && \
defined(CONFIG_EXAMPLES_MODULE_FSREMOVEABLE)
struct stat buf;
#endif
FAR void *handle;
char buffer[128];
ssize_t nbytes;
int ret;
int fd;
#ifdef CONFIG_BUILD_FLAT
/* Set the OS symbol table indirectly through the boardctl() */
symdesc.symtab = (FAR struct symtab_s *)g_mod_exports;
symdesc.nsymbols = g_mod_nexports;
ret = boardctl(BOARDIOC_OS_SYMTAB, (uintptr_t)&symdesc);
if (ret < 0)
{
fprintf(stderr, "ERROR: boardctl(BOARDIOC_OS_SYMTAB) failed: %d\n",
ret);
exit(EXIT_FAILURE);
}
#endif
#ifdef CONFIG_EXAMPLES_MODULE_BUILTINFS
#if defined(CONFIG_EXAMPLES_MODULE_ROMFS)
/* Create a ROM disk for the ROMFS filesystem */
printf("main: Registering romdisk at /dev/ram%d\n",
CONFIG_EXAMPLES_MODULE_DEVMINOR);
#if defined(CONFIG_BUILD_FLAT)
/* This example violates the portable POSIX interface by calling the OS
* internal function romdisk_register() (aka ramdisk_register()). We can
* squeak by in with this violation in the FLAT build mode, but not in
* other build modes. In other build modes, the following logic must be
* performed in the OS board initialization logic (where it really belongs
* anyway).
*/
ret = romdisk_register(CONFIG_EXAMPLES_MODULE_DEVMINOR,
(FAR uint8_t *)romfs_img,
NSECTORS(romfs_img_len), SECTORSIZE);
if (ret < 0)
{
/* This will happen naturally if we registered the ROM disk
* previously.
*/
if (ret != -EEXIST)
{
fprintf(stderr, "ERROR: romdisk_register failed: %d\n", ret);
exit(EXIT_FAILURE);
}
printf("main: ROM disk already registered\n");
}
#endif
/* Mount the file system */
printf("main: Mounting ROMFS filesystem at target=%s with source=%s\n",
MOUNTPT, CONFIG_EXAMPLES_MODULE_DEVPATH);
ret = mount(CONFIG_EXAMPLES_MODULE_DEVPATH, MOUNTPT, "romfs",
MS_RDONLY, NULL);
if (ret < 0)
{
fprintf(stderr, "ERROR: mount(%s,%s,romfs) failed: %s\n",
CONFIG_EXAMPLES_MODULE_DEVPATH, MOUNTPT, strerror(errno));
exit(EXIT_FAILURE);
}
#elif defined(CONFIG_EXAMPLES_MODULE_CROMFS)
/* Mount the CROMFS file system */
printf("Mounting CROMFS filesystem at target=%s\n", MOUNTPT);
ret = mount(NULL, MOUNTPT, "cromfs", MS_RDONLY, NULL);
if (ret < 0)
{
errmsg("ERROR: mount(%s, cromfs) failed: %d\n", MOUNTPT, errno);
}
#endif /* CONFIG_EXAMPLES_MODULE_ROMFS */
#else /* CONFIG_EXAMPLES_MODULE_BUILTINFS */
/* An external file system is being used */
#if defined(CONFIG_EXAMPLES_MODULE_FSMOUNT)
#if defined(CONFIG_EXAMPLES_MODULE_FSREMOVEABLE)
/* The file system is removable, wait until the block driver is available */
do
{
ret = stat(CONFIG_EXAMPLES_MODULE_DEVPATH, &buf);
if (ret < 0)
{
int errcode = errno;
if (errcode == ENOENT)
{
printf("%s does not exist. Waiting...\n",
CONFIG_EXAMPLES_MODULE_DEVPATH);
sleep(1);
}
else
{
printf("ERROR: stat(%s) failed: %d Aborting...\n",
CONFIG_EXAMPLES_MODULE_DEVPATH, errcode);
exit(EXIT_FAILURE);
}
}
else if (!S_ISBLK(buf.st_mode))
{
printf("ERROR: stat(%s) exists but is not a block driver: %04x\n",
CONFIG_EXAMPLES_MODULE_DEVPATH, buf.st_mode);
exit(EXIT_FAILURE);
}
}
while (ret < 0);
#endif /* CONFIG_EXAMPLES_MODULE_FSREMOVEABLE */
/* Mount the external file system */
printf("Mounting %s filesystem at target=%s\n",
CONFIG_EXAMPLES_MODULE_FSTYPE, MOUNTPT);
ret = mount(CONFIG_EXAMPLES_MODULE_DEVPATH, MOUNTPT,
CONFIG_EXAMPLES_MODULE_FSTYPE, MS_RDONLY, NULL);
if (ret < 0)
{
printf("ERROR: mount(%s, %s, %s) failed: %d\n",
CONFIG_EXAMPLES_MODULE_DEVPATH, CONFIG_EXAMPLES_MODULE_FSTYPE,
MOUNTPT, errno);
}
#endif /* CONFIG_EXAMPLES_MODULE_FSMOUNT */
#endif /* CONFIG_EXAMPLES_MODULE_BUILTINFS */
/* Install the character driver */
handle = insmod(BINDIR "/chardev", "chardev");
if (handle == NULL)
{
int errcode = errno;
fprintf(stderr, "ERROR: insmod(%s/chardev, chardev) failed: %d\n",
BINDIR, errcode);
exit(EXIT_FAILURE);
}
/* Open the installed character driver */
fd = open("/dev/chardev", O_RDWR);
if (fd < 0)
{
int errcode = errno;
fprintf(stderr, "ERROR: Failed to open /dev/chardev: %d\n", errcode);
exit(EXIT_FAILURE);
}
/* Read from the character driver */
nbytes = read(fd, buffer, 128);
if (nbytes < 0)
{
int errcode = errno;
fprintf(stderr, "ERROR: Read from /dev/chardev failed: %d\n", errcode);
close(fd);
exit(EXIT_FAILURE);
}
printf("main: Read %d bytes\n", (int)nbytes);
lib_dumpbuffer("main: Bytes read", (FAR const uint8_t *)buffer, nbytes);
/* Write to the character driver */
nbytes = write(fd, g_write_string, strlen(g_write_string));
if (nbytes < 0)
{
int errcode = errno;
fprintf(stderr, "ERROR: Write to /dev/chardev failed: %d\n", errcode);
close(fd);
exit(EXIT_FAILURE);
}
printf("main: Wrote %d bytes\n", (int)nbytes);
lib_dumpbuffer("main: Bytes written", (FAR const uint8_t *)g_write_string,
nbytes);
close(fd);
ret = rmmod(handle);
if (ret < 0)
{
fprintf(stderr, "ERROR: rmmod failed: %d\n", ret);
exit(EXIT_FAILURE);
}
return EXIT_SUCCESS;
}