nuttx/drivers/syslog/syslog_chardev.c

/****************************************************************************
 * drivers/syslog/syslog_chardev.c
 *
 *   Copyright (C) 2016 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 <sys/types.h>
#include <stdbool.h>
#include <string.h>
#include <poll.h>
#include <errno.h>

#include <nuttx/fs/fs.h>
#include <syslog.h>

#include "syslog.h"

#ifdef CONFIG_SYSLOG_CHARDEV

/****************************************************************************
 * Private Function Prototypes
 ****************************************************************************/

static ssize_t syslog_chardev_write(FAR struct file *filep,
                                    FAR const char *buffer, size_t buflen);

/****************************************************************************
 * Private Data
 ****************************************************************************/

static const struct file_operations syslog_fops =
{
  NULL,          /* open */
  NULL,          /* close */
  NULL,          /* read */
  syslog_chardev_write, /* write */
  NULL,          /* seek */
  NULL,          /* ioctl */
  NULL           /* poll */
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
  , NULL         /* unlink */
#endif
};

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Name: syslog_chardev_write
 ****************************************************************************/

static ssize_t syslog_chardev_write(FAR struct file *filep,
                                    FAR const char *buffer, size_t len)
{
  syslog(LOG_INFO, "%.*s", (int)len, buffer);
  return len;
}

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: syslog_register
 *
 * Description:
 *   Register a simple character driver at /dev/syslog whose write() method
 *   will transfer data to the SYSLOG device.  This can be useful if, for
 *   example, you want to redirect the output of a program to the SYSLOG.
 *
 *   NOTE that unlike other syslog output, this data is unformatted raw
 *   byte output with no time-stamping or any other SYSLOG features
 *   supported.
 *
 ****************************************************************************/

void syslog_register(void)
{
  (void)register_driver("/dev/syslog", &syslog_fops, 0222, NULL);
}

#endif /* CONFIG_SYSLOG_CHARDEV */