Add a SYSLOG character device that can be used to re-direct output to the SYSLOG

ReleaseNotes

@@ -2570,7 +2570,7 @@ New features and extended functionality:
       particular for a CDC/ACM with MSC USB composite driver).
 
       Added a new RAM logging driver.  This will allow debug output into
-      a RAM buffer associated with a character driver at /dev/syslog.
+      a RAM buffer associated with a character driver at /dev/ramlog.
       Added the new command 'dmesg' to NSH that can be used to dump the
       current contents of the log.  This is useful for systems that do not
       have the usual serial console (for example, if you only have a

drivers/syslog/Kconfig

@@ -172,7 +172,7 @@ config SYSLOG_CHAR_CRLF
 
 config SYSLOG_DEVPATH
 	string "System log device"
-	default "/dev/syslog"
+	default "/dev/ttyS1"
 	depends on SYSLOG_CHAR
 	---help---
 		The full path to the system logging device.  For the RAMLOG SYSLOG device,
@@ -180,4 +180,17 @@ config SYSLOG_DEVPATH
 		some other existing character device (or file) supported by the configuration
 		(such as "/dev/ttyS1")/
 
+config SYSLOG_CHARDEV
+	bool "SYSLOG character device"
+	default n
+	---help---
+		Enables support for 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.
+
 endmenu # System logging

drivers/syslog/Make.defs

@@ -80,7 +80,9 @@ ifeq ($(CONFIG_SYSLOG_FILE),y)
 CSRCS += syslog_filechannel.c
 endif
 
-# (Add other SYSLOG drivers here)
+ifeq ($(CONFIG_SYSLOG_CHARDEV),y)
+CSRCS += syslog_chardev.c
+endif
 
 ifeq ($(CONFIG_CONSOLE_SYSLOG),y)
   CSRCS += syslog_console.c

drivers/syslog/syslog_chardev.c

@@ -0,0 +1,129 @@
+/****************************************************************************
+ * 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 <nuttx/syslog/syslog.h>
+
+#include "syslog.h"
+
+#ifdef CONFIG_SYSLOG_CHARDEV
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static ssize_t syslog_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_write,  /* write */
+  NULL,          /* seek */
+  NULL           /* ioctl */
+#ifndef CONFIG_DISABLE_POLL
+  , NULL         /* poll */
+#endif
+#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
+  , NULL         /* unlink */
+#endif
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: syslog_write
+ ****************************************************************************/
+
+static ssize_t syslog_write(FAR struct file *filep, FAR const char *buffer,
+                            size_t len)
+{
+  size_t nwritten;
+  int ret;
+
+  for (nwritten = 0; nwritten < len; nwritten++)
+    {
+      int ch = *buffer++;
+      ret = syslog_putc(ch);
+      UNUSED(ret);
+    }
+
+  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 */

fs/vfs/fs_ioctl.c

@@ -135,7 +135,6 @@ int ioctl(int fd, int req, unsigned long arg)
   int errcode;
 #if CONFIG_NFILE_DESCRIPTORS > 0
   FAR struct file *filep;
-  int ret = OK;
 
   /* Did we get a valid file descriptor? */
 

include/nuttx/syslog/syslog.h

@@ -271,6 +271,24 @@ int syslog_flush(void);
 
 int _vsyslog(int priority, FAR const IPTR char *src, FAR va_list *ap);
 
+/****************************************************************************
+ * 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.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_SYSLOG_CHARDEV
+void syslog_register(void);
+#endif
+
 #undef EXTERN
 #ifdef __cplusplus
 }