Add dmesg command that can be used to dump the syslog

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4382 7fd9a85b-ad96-42d3-883c-3090e2eb8679

nuttx/lib/stdio/Make.defs

@@ -52,7 +52,7 @@ STDIO_SRCS += lib_fopen.c lib_fclose.c lib_fread.c lib_libfread.c lib_fseek.c \
 endif
 endif
 
-ifdef ($(CONFIG_SYSLOG)
+ifeq ($(CONFIG_SYSLOG),y)
 STDIO_SRCS += lib_syslogstream.c
 endif
 

nuttx/lib/stdio/lib_lowprintf.c

@@ -42,6 +42,10 @@
 #include <debug.h>
 #include "lib_internal.h"
 
+/* This interface can only be used from within the kernel */
+
+#if !defined(CONFIG_NUTTX_KERNEL) || defined(__KERNEL__)
+
 /****************************************************************************
  * Definitions
  ****************************************************************************/
@@ -113,4 +117,5 @@ int lib_lowprintf(const char *fmt, ...)
   return ret;
 }
 
-#endif /* CONFIG_ARCH_LOWPUTC || CONFIG_SYSLOG*/
+#endif /* CONFIG_ARCH_LOWPUTC || CONFIG_SYSLOG */
+#endif /* __KERNEL__ */

nuttx/lib/stdio/lib_rawprintf.c

@@ -42,9 +42,16 @@
 #include "lib_internal.h"
 
 /****************************************************************************
- * Definitions
+ * Pre-processor Definitions
  ****************************************************************************/
 
+/* Some output destinations are only available from within the kernel */
+
+#if defined(CONFIG_NUTTX_KERNEL) && !defined(__KERNEL__)
+#  undef CONFIG_SYSLOG
+#  undef CONFIG_ARCH_LOWPUTC
+#endif
+
 /****************************************************************************
  * Private Type Declarations
  ****************************************************************************/

nuttx/lib/stdio/lib_syslogstream.c

@@ -75,7 +75,7 @@ static void syslogstream_putc(FAR struct lib_outstream_s *this, int ch)
  ****************************************************************************/
 
 /****************************************************************************
- * Name: lib_sylogstream
+ * Name: lib_syslogstream
  *
  * Description:
  *   Initializes a stream for use with the coinfigured syslog interface.
@@ -89,7 +89,7 @@ static void syslogstream_putc(FAR struct lib_outstream_s *this, int ch)
  *
  ****************************************************************************/
 
-void lib_sylogstream(FAR struct lib_outstream_s *stream)
+void lib_syslogstream(FAR struct lib_outstream_s *stream)
 {
   stream->put   = syslogstream_putc;
 #ifdef CONFIG_STDIO_LINEBUFFER