Move RAMLOG driver to drivers/syslog; Add ability to output debug information to any character device or file

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4996 42af7a65-404d-4744-a932-0658087f49c3

include/nuttx/ramlog.h

@@ -54,6 +54,7 @@
  ****************************************************************************/
 
 #include <nuttx/config.h>
+#include <nuttx/syslog.h>
 
 #ifdef CONFIG_RAMLOG
 
@@ -90,6 +91,10 @@
 #  undef CONFIG_RAMLOG_SYSLOG
 #endif
 
+#if defined(CONFIG_RAMLOG_SYSLOG) && !defined(CONFIG_SYSLOG_DEVPATH)
+#  define CONFIG_SYSLOG_DEVPATH "/dev/ramlog"
+#endif
+
 #ifndef CONFIG_RAMLOG_NPOLLWAITERS
 #  define CONFIG_RAMLOG_NPOLLWAITERS 4
 #endif
@@ -167,7 +172,7 @@ EXTERN int ramlog_register(FAR const char *devpath, FAR char *buffer,
  *   Mostly likely this path will be /dev/console.
  *
  *   If CONFIG_RAMLOG_SYSLOG is also defined, then the same RAM logging
- *   device is also registered at /dev/syslog
+ *   device is also registered at CONFIG_SYSLOG_DEVPATH
  *
  ****************************************************************************/
 
@@ -180,7 +185,7 @@ EXTERN int ramlog_consoleinit(void);
  *
  * Description:
  *   Create the RAM logging device and register it at the specified path.
- *   Mostly likely this path will be /dev/syslog
+ *   Mostly likely this path will be CONFIG_SYSLOG_DEVPATH
  *
  *   If CONFIG_RAMLOG_CONSOLE is also defined, then this functionality is
  *   performed when ramlog_consoleinit() is called.
@@ -191,23 +196,6 @@ EXTERN int ramlog_consoleinit(void);
 EXTERN int ramlog_sysloginit(void);
 #endif
 
-/****************************************************************************
- * Name: ramlog
- *
- * Description:
- *   This is the low-level system logging interface.  The debugging/syslogging
- *   interfaces are lib_rawprintf() and lib_lowprinf().  The difference is
- *   the lib_rawprintf() writes to fd=1 (stdout) and lib_lowprintf() uses
- *   a lower level interface that works from interrupt handlers.  This
- *   function is a a low-level interface used to implement lib_lowprintf()
- *   when CONFIG_RAMLOG_SYSLOG=y and CONFIG_SYSLOG=ramlog
- *
- ****************************************************************************/
-
-#if defined(CONFIG_RAMLOG_CONSOLE) || defined(CONFIG_RAMLOG_SYSLOG)
-EXTERN int ramlog_putc(int ch);
-#endif
-
 #undef EXTERN
 #ifdef __cplusplus
 }

include/nuttx/syslog.h

@@ -0,0 +1,131 @@
+/****************************************************************************
+ * include/nuttx/syslog.h
+ * The NuttX SYSLOGing interface
+ *
+ *   Copyright (C) 2012 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.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_NUTTX_SYSLOG_H
+#define __INCLUDE_NUTTX_SYSLOG_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+/* Configuration ************************************************************/
+/* CONFIG_SYSLOG - Enables generic system logging features.
+ * CONFIG_SYSLOG_DEVPATH - The full path to the system logging device
+ *
+ * In addition, some SYSLOG device must also be enabled that will provide
+ * the syslog_putc() function.  As of this writing, there are two SYSLOG
+ * devices avaiable:
+ *
+ *   1. A RAM SYSLOGing device that will log data into a circular buffer
+ *      that can be dumped using the NSH dmesg command.  This device is
+ *      described in the include/nuttx/ramlog.h header file.
+ *
+ *   2. And a generic character device that may be used as the SYSLOG.  The
+ *      generic device interfaces are described in this file.
+ *
+ * CONFIG_SYSLOG_CHAR - Enable the generic character device for the SYSLOG.
+ *   The full path to the SYSLOG device is provided by CONFIG_SYSLOG_DEVPATH.
+ *   A valid character device must exist at this path.  It will by opened
+ *   by syslog_initialize.
+ *
+ *   NOTE:  No more than one SYSLOG device should be configured.
+ */
+
+#ifndef CONFIG_SYSLOG
+#  undef CONFIG_SYSLOG_CHAR
+#endif
+
+#if defined(CONFIG_SYSLOG_CHAR) && !defined(CONFIG_SYSLOG_DEVPATH)
+#  define CONFIG_SYSLOG_DEVPATH "/dev/ttyS1"
+#endif
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+/****************************************************************************
+ * Name: syslog_initialize
+ *
+ * Description:
+ *   Initialize to use the character device at CONFIG_SYSLOG_DEVPATH as the
+ *   SYSLOG.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_SYSLOG_CHAR
+EXTERN int syslog_initialize(void);
+#endif
+
+/****************************************************************************
+ * Name: syslog_putc
+ *
+ * Description:
+ *   This is the low-level system logging interface.  The debugging/syslogging
+ *   interfaces are lib_rawprintf() and lib_lowprinf().  The difference is
+ *   the lib_rawprintf() writes to fd=1 (stdout) and lib_lowprintf() uses
+ *   a lower level interface that works from interrupt handlers.  This
+ *   function is a a low-level interface used to implement lib_lowprintf().
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_SYSLOG
+EXTERN int syslog_putc(int ch);
+#endif
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif /* __INCLUDE_NUTTX_SYSLOG_H */