/****************************************************************************
* examples/module/module_main.c
*
* Copyright (C) 2015, 2017 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>
#ifdef CONFIG_EXAMPLES_MODULE_BUILTINFS
# include <sys/mount.h>
#endif
#include <sys/boardctl.h>
#include <stdio.h>
#include <stdlib.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/binfmt/symtab.h>
#ifdef CONFIG_EXAMPLES_MODULE_BUILTINFS
# include <nuttx/drivers/ramdisk.h>
# include "drivers/romfs.h"
#endif
/****************************************************************************
* Pre-processor 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
#ifndef CONFIG_MODULE
# error "You must select CONFIG_MODULE in your configuration file"
#endif
#ifdef CONFIG_EXAMPLES_MODULE_BUILTINFS
# 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
/* Describe the ROMFS file system */
# define SECTORSIZE 64
# define NSECTORS(b) (((b)+SECTORSIZE-1)/SECTORSIZE)
# define BINDIR "/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
#else
# 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
****************************************************************************/
extern const struct symtab_s mod_exports[];
extern const int mod_nexports;
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: module_main
****************************************************************************/
#ifdef CONFIG_BUILD_KERNEL
int main(int argc, FAR char *argv[])
#else
int module_main(int argc, char *argv[])
#endif
{
struct boardioc_symtab_s symdesc;
FAR void *handle;
char buffer[128];
ssize_t nbytes;
int ret;
int fd;
/* Set the OS symbol table indirectly through the boardctl() */
symdesc.symtab = (FAR struct symtab_s *)mod_exports;
symdesc.nsymbols = 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);
}
#ifdef CONFIG_EXAMPLES_MODULE_BUILTINFS
/* Create a ROM disk for the ROMFS filesystem */
printf("main: Registering romdisk at /dev/ram%d\n",
CONFIG_EXAMPLES_MODULE_DEVMINOR);
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");
}
/* Mount the file system */
printf("main: Mounting ROMFS filesystem at target=%s with source=%s\n",
BINDIR, CONFIG_EXAMPLES_MODULE_DEVPATH);
ret = mount(CONFIG_EXAMPLES_MODULE_DEVPATH, BINDIR, "romfs", MS_RDONLY, NULL);
if (ret < 0)
{
fprintf(stderr, "ERROR: mount(%s,%s,romfs) failed: %s\n",
CONFIG_EXAMPLES_MODULE_DEVPATH, BINDIR, errno);
exit(EXIT_FAILURE);
}
#endif /* CONFIG_EXAMPLES_MODULE_BUILTINFS */
/* Install the character driver */
handle = insmod(BINDIR "/chardev", "chardev");
if (handle == NULL)
{
int errcode = errno;
fprintf(stderr, "ERROR: insmod failed: %d\n", 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: %d\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: %d\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;
}