Implement setlogmask(); move some syslog logic from libc/syslog to fs/syslog

16 files changed, 573 insertions, 156 deletions

diff --git a/nuttx/fs/Makefile b/nuttx/fs/Makefile
index 0c7250604..33e6b315c 100644
--- a/nuttx/fs/Makefile
+++ b/nuttx/fs/Makefile
@@ -48,6 +48,7 @@ include vfs/Make.defs
 include driver/Make.defs
 include dirent/Make.defs
 include aio/Make.defs
+include syslog/Make.defs
 include mmap/Make.defs
 
 # OS resources
diff --git a/nuttx/fs/driver/Make.defs b/nuttx/fs/driver/Make.defs
index 64338dece..1a7ea9e55 100644
--- a/nuttx/fs/driver/Make.defs
+++ b/nuttx/fs/driver/Make.defs
@@ -41,14 +41,6 @@ CSRCS += fs_registerdriver.c fs_unregisterdriver.c
 CSRCS += fs_registerblockdriver.c fs_unregisterblockdriver.c
 CSRCS += fs_findblockdriver.c fs_openblockdriver.c fs_closeblockdriver.c
 
-# System logging to a character device (or file)
-
-ifeq ($(CONFIG_SYSLOG),y)
-ifeq ($(CONFIG_SYSLOG_CHAR),y)
-CSRCS += fs_syslog.c
-endif
-endif
-
 # Include driver build support
 
 DEPPATH += --dep-path driver
diff --git a/nuttx/fs/syslog/Make.defs b/nuttx/fs/syslog/Make.defs
new file mode 100644
index 000000000..21e04e9e6
--- /dev/null
+++ b/nuttx/fs/syslog/Make.defs
@@ -0,0 +1,59 @@
+############################################################################
+# libc/syslog/Make.defs
+#
+#   Copyright (C) 2014 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.
+#
+############################################################################
+
+# Add the internal C files to the build
+
+CSRCS += fs_vsyslog.c fs_lowvsyslog.c fs_setlogmask.c
+
+ifeq ($(CONFIG_SYSLOG),y)
+CSRCS += fs_syslogstream.c
+endif
+
+ifeq ($(CONFIG_SYSLOG_ENABLE),y)
+CSRCS += fs_syslogenable.c
+endif
+
+# System logging to a character device (or file)
+
+ifeq ($(CONFIG_SYSLOG),y)
+ifeq ($(CONFIG_SYSLOG_CHAR),y)
+CSRCS += fs_syslog.c
+endif
+endif
+
+# Add the syslog directory to the build
+
+DEPPATH += --dep-path syslog
+VPATH += :syslog
diff --git a/nuttx/fs/syslog/fs_lowvsyslog.c b/nuttx/fs/syslog/fs_lowvsyslog.c
new file mode 100644
index 000000000..52d493a73
--- /dev/null
+++ b/nuttx/fs/syslog/fs_lowvsyslog.c
@@ -0,0 +1,129 @@
+/****************************************************************************
+ * fs/syslog/fs_lowsyslog.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2012 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <syslog.h>
+
+#include <nuttx/streams.h>
+
+#include "syslog/syslog.h"
+
+#if defined(CONFIG_ARCH_LOWPUTC) || defined(CONFIG_SYSLOG)
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lowvsyslog_internal
+ ****************************************************************************/
+
+static inline int lowvsyslog_internal(FAR const char *fmt, va_list ap)
+{
+  struct lib_outstream_s stream;
+
+  /* Wrap the stdout in a stream object and let lib_vsprintf do the work. */
+
+#ifdef CONFIG_SYSLOG
+  lib_syslogstream((FAR struct lib_outstream_s *)&stream);
+#else
+  lib_lowoutstream((FAR struct lib_outstream_s *)&stream);
+#endif
+  return lib_vsprintf((FAR struct lib_outstream_s *)&stream, fmt, ap);
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lowvsyslog
+ ****************************************************************************/
+
+int lowvsyslog(int priority, FAR const char *fmt, va_list ap)
+{
+  int ret = 0;
+
+  /* Check if this priority is enabled */
+
+  if ((g_syslog_mask & LOG_MASK(priority)) != 0)
+    {
+      /* Yes.. let vsylog_internal to the deed */
+
+      ret = lowvsyslog_internal(fmt, ap);
+    }
+
+  return ret;
+}
+
+#endif /* CONFIG_ARCH_LOWPUTC || CONFIG_SYSLOG */
diff --git a/nuttx/fs/syslog/fs_setlogmask.c b/nuttx/fs/syslog/fs_setlogmask.c
new file mode 100644
index 000000000..802fb5ba5
--- /dev/null
+++ b/nuttx/fs/syslog/fs_setlogmask.c
@@ -0,0 +1,121 @@
+/****************************************************************************
+ * fs/syslog/fs_setlogmask.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2012 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <syslog.h>
+
+#include <arch/irq.h>
+
+#include "syslog/syslog.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#ifdef CONFIG_SYSLOG_ENABLE
+/* The initial mask is all disabled */
+
+#  define INITIAL_SYSLOG_MASK 0
+#else
+/* The initial mask is all enabled */
+
+#  define INITIAL_SYSLOG_MASK LOG_ALL
+#endif
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/* The currently enabled set of syslog priorities */
+
+uint8_t g_syslog_mask = INITIAL_SYSLOG_MASK;
+
+#ifdef CONFIG_SYSLOG_ENABLE
+/* True if the syslog is enabled */
+
+bool g_syslog_enabled;
+
+/* The set of syslog priorities to use when the syslog is enabled */
+
+uint8_t g_syslog_enablemask = LOG_ALL;
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: setlogmask
+ *
+ * Description:
+ *  Enable or disable debug output.
+ *
+ ****************************************************************************/
+
+int setlogmask(int mask)
+{
+  uint8_t oldmask;
+  irqstate_t flags;
+
+  /* These operations must be exclusive with respect to other threads as well
+   * as interrupts.
+   */
+
+  flags = irqsave();
+
+#ifdef CONFIG_SYSLOG_ENABLE
+  /* If the syslog is disabled, use the saved enable mask */
+
+  if (!g_syslog_enabled)
+    {
+      oldmask             = g_syslog_enablemask;
+      g_syslog_enablemask = (uint8_t)mask;
+    }
+  else
+#endif
+    {
+      oldmask             = g_syslog_mask;
+      g_syslog_mask       = (uint8_t)mask;
+    }
+
+  irqrestore(flags);
+  return oldmask;
+}
diff --git a/nuttx/fs/driver/fs_syslog.c b/nuttx/fs/syslog/fs_syslog.c
index ef35fb548..151f1cab9 100644
--- a/nuttx/fs/driver/fs_syslog.c
+++ b/nuttx/fs/syslog/fs_syslog.c
@@ -1,5 +1,5 @@
 /****************************************************************************
- * fs/syslog.c
+ * fs/syslog/syslog.c
  *
  *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
diff --git a/nuttx/libc/syslog/lib_syslogenable.c b/nuttx/fs/syslog/fs_syslogenable.c
index adba5b708..2395a6dc6 100644
--- a/nuttx/libc/syslog/lib_syslogenable.c
+++ b/nuttx/fs/syslog/fs_syslogenable.c
@@ -1,7 +1,7 @@
 /****************************************************************************
- * libc/syslog/lib_syslogenable.c
+ * fs/syslog/fs_syslogenable.c
  *
- *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2009, 2011-2012, 2014 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -40,18 +40,13 @@
 #include <nuttx/config.h>
 
 #include <stdbool.h>
+#include <syslog.h>
 
-#include "lib_internal.h"
+#include <arch/irq.h>
 
-#ifdef CONFIG_SYSLOG_ENABLE
-
-/****************************************************************************
- * Public Data
- ****************************************************************************/
-
-/* Debug output is initially disabled */
+#include "syslog/syslog.h"
 
-bool g_syslogenable;
+#ifdef CONFIG_SYSLOG_ENABLE
 
 /****************************************************************************
  * Public Functions
@@ -67,7 +62,29 @@ bool g_syslogenable;
 
 void syslog_enable(bool enable)
 {
-  g_syslogenable = enable;
+  irqstate_t flags;
+
+  /* These operations must be exclusive with respect to other threads as well
+   * as interrupts.
+   */
+
+  flags = irqsave();
+  if (enable && !g_syslog_enabled)
+    {
+      /* Transition from the disabled to the enabled state */
+
+      g_syslog_mask    = g_syslog_enablemask; /* Restore the enabled mask */
+      g_syslog_enabled = true;                /* Mark enabled */
+    }
+  else if (!enabled && g_syslog_enabled)
+    {
+      /* Transition from the enabled to the disabled state */
+
+      g_syslog_enablemask = g_syslog_mask;    /* Save the enabled mask */
+      g_syslog_mask       = 0;                /* Clear the current mask */
+      g_syslog_enabled    = false             /* Remember not enabled */
+    }
+  irqrestore(flags);
 }
 
 #endif /* CONFIG_SYSLOG_ENABLE */
diff --git a/nuttx/libc/syslog/lib_syslogstream.c b/nuttx/fs/syslog/fs_syslogstream.c
index 7d485e74c..4c6cfa8c2 100644
--- a/nuttx/libc/syslog/lib_syslogstream.c
+++ b/nuttx/fs/syslog/fs_syslogstream.c
@@ -39,13 +39,14 @@
 
 #include <nuttx/config.h>
 
+#include <stdio.h>
 #include <unistd.h>
 #include <assert.h>
 #include <errno.h>
 
 #include <nuttx/syslog/syslog.h>
+#include <nuttx/streams.h>
 
-#include "lib_internal.h"
 #include "syslog/syslog.h"
 
 #ifdef CONFIG_SYSLOG
diff --git a/nuttx/fs/syslog/fs_vsyslog.c b/nuttx/fs/syslog/fs_vsyslog.c
new file mode 100644
index 000000000..8d49570ec
--- /dev/null
+++ b/nuttx/fs/syslog/fs_vsyslog.c
@@ -0,0 +1,151 @@
+/****************************************************************************
+ * libc/syslog/fs_vsyslog.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2014 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 <stdio.h>
+#include <syslog.h>
+
+#include <nuttx/streams.h>
+
+#include "syslog/syslog.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: vsyslog_internal
+ ****************************************************************************/
+
+static inline int vsyslog_internal(FAR const char *fmt, va_list ap)
+{
+#if defined(CONFIG_SYSLOG)
+
+  struct lib_outstream_s stream;
+
+  /* Wrap the low-level output in a stream object and let lib_vsprintf
+   * do the work.
+   */
+
+  lib_syslogstream((FAR struct lib_outstream_s *)&stream);
+  return lib_vsprintf((FAR struct lib_outstream_s *)&stream, fmt, ap);
+
+#elif CONFIG_NFILE_DESCRIPTORS > 0
+
+  struct lib_rawoutstream_s rawoutstream;
+
+  /* Wrap the stdout in a stream object and let lib_vsprintf
+   * do the work.
+   */
+
+  lib_rawoutstream(&rawoutstream, 1);
+  return lib_vsprintf(&rawoutstream.public, fmt, ap);
+
+#elif defined(CONFIG_ARCH_LOWPUTC)
+
+  struct lib_outstream_s stream;
+
+  /* Wrap the low-level output in a stream object and let lib_vsprintf
+   * do the work.
+   */
+
+  lib_lowoutstream((FAR struct lib_outstream_s *)&stream);
+  return lib_vsprintf((FAR struct lib_outstream_s *)&stream, fmt, ap);
+
+#else
+  return 0;
+#endif
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: vsyslog
+ ****************************************************************************/
+
+int vsyslog(int priority, FAR const char *fmt, va_list ap)
+{
+  int ret = 0;
+
+  /* Check if this priority is enabled */
+
+  if ((g_syslog_mask & LOG_MASK(priority)) != 0)
+    {
+      /* Yes.. let vsylog_internal to the deed */
+
+      ret = vsyslog_internal(fmt, ap);
+    }
+
+  return ret;
+}
diff --git a/nuttx/libc/syslog/syslog.h b/nuttx/fs/syslog/syslog.h
index 6f9cb5ffa..bd5d1a724 100644
--- a/nuttx/libc/syslog/syslog.h
+++ b/nuttx/fs/syslog/syslog.h
@@ -41,6 +41,7 @@
  ****************************************************************************/
 
 #include <nuttx/config.h>
+#include <stdbool.h>
 
 /****************************************************************************
  * Pre-processor Definitions
@@ -63,9 +64,17 @@ extern "C"
 #define EXTERN extern
 #endif
 
-/* Debug output is initially disabled */
+/* The currently enabled set of syslog priorities */
+
+EXTERN uint8_t g_syslog_mask;
 
 #ifdef CONFIG_SYSLOG_ENABLE
+/* True if the syslog is enabled */
+
+EXTERN bool g_syslogenable;
+
+/* The set of syslog priorities to use when the syslog is enabled */
+
 EXTERN bool g_syslogenable;
 #endif
 
diff --git a/nuttx/include/nuttx/streams.h b/nuttx/include/nuttx/streams.h
index 01ec965c3..139741ff0 100644
--- a/nuttx/include/nuttx/streams.h
+++ b/nuttx/include/nuttx/streams.h
@@ -372,6 +372,51 @@ void lib_nulloutstream(FAR struct lib_outstream_s *nulloutstream);
 void lib_syslogstream(FAR struct lib_outstream_s *stream);
 #endif
 
+/****************************************************************************
+ * Name: lib_noflush
+ *
+ * Description:
+ *  lib_noflush() provides a common, dummy flush method for output streams
+ *  that are not flushable.  Only used if CONFIG_STDIO_LINEBUFFER is selected.
+ *
+ * Return:
+ *  Always returns OK
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_STDIO_LINEBUFFER
+int lib_noflush(FAR struct lib_outstream_s *stream);
+#endif
+
+/****************************************************************************
+ * Name: lib_snoflush
+ *
+ * Description:
+ *  lib_snoflush() provides a common, dummy flush method for seekable output
+ *  streams that are not flushable.  Only used if CONFIG_STDIO_LINEBUFFER
+ *  is selected.
+ *
+ * Return:
+ *  Always returns OK
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_STDIO_LINEBUFFER
+int lib_snoflush(FAR struct lib_sostream_s *this);
+#endif
+
+/****************************************************************************
+ * Name: lib_sprintf and lib_vsprintf
+ *
+ * Description:
+ *  Stream-oriented versions of sprintf and vsprintf.
+ *
+ ****************************************************************************/
+
+int lib_sprintf(FAR struct lib_outstream_s *obj, FAR const char *fmt, ...);
+int lib_vsprintf(FAR struct lib_outstream_s *obj,
+                 FAR const char *src, va_list ap);
+
 #undef EXTERN
 #if defined(__cplusplus)
 }
diff --git a/nuttx/libc/lib_internal.h b/nuttx/libc/lib_internal.h
index b6518da6d..a9f8a3fbc 100644
--- a/nuttx/libc/lib_internal.h
+++ b/nuttx/libc/lib_internal.h
@@ -148,28 +148,6 @@ void  stream_semtake(FAR struct streamlist *list);
 void  stream_semgive(FAR struct streamlist *list);
 #endif
 
-/* Defined in lib_libnoflush.c */
-
-#ifdef CONFIG_STDIO_LINEBUFFER
-int lib_noflush(FAR struct lib_outstream_s *this);
-#endif
-
-/* Defined in lib_libsnoflush.c */
-
-#ifdef CONFIG_STDIO_LINEBUFFER
-int lib_snoflush(FAR struct lib_sostream_s *this);
-#endif
-
-/* Defined in lib_libsprintf.c */
-
-int lib_sprintf(FAR struct lib_outstream_s *obj,
-                       const char *fmt, ...);
-
-/* Defined lib_libvsprintf.c */
-
-int lib_vsprintf(FAR struct lib_outstream_s *obj,
-                 FAR const char *src, va_list ap);
-
 /* Defined in lib_dtoa.c */
 
 #ifdef CONFIG_LIBC_FLOATINGPOINT
diff --git a/nuttx/libc/stdio/lib_libnoflush.c b/nuttx/libc/stdio/lib_libnoflush.c
index 076f8a17e..eafe63977 100644
--- a/nuttx/libc/stdio/lib_libnoflush.c
+++ b/nuttx/libc/stdio/lib_libnoflush.c
@@ -45,6 +45,7 @@
 #include <errno.h>
 
 #include <nuttx/fs/fs.h>
+#include <nuttx/streams.h>
 
 #include "lib_internal.h"
 
diff --git a/nuttx/libc/syslog/Make.defs b/nuttx/libc/syslog/Make.defs
index fe6e620ed..9df5c3228 100644
--- a/nuttx/libc/syslog/Make.defs
+++ b/nuttx/libc/syslog/Make.defs
@@ -37,14 +37,6 @@
 
 CSRCS += lib_syslog.c lib_lowsyslog.c
 
-ifeq ($(CONFIG_SYSLOG),y)
-CSRCS += lib_syslogstream.c
-endif
-
-ifeq ($(CONFIG_SYSLOG_ENABLE),y)
-CSRCS += lib_syslogenable.c
-endif
-
 # Add the syslog directory to the build
 
 DEPPATH += --dep-path syslog
diff --git a/nuttx/libc/syslog/lib_lowsyslog.c b/nuttx/libc/syslog/lib_lowsyslog.c
index f7287c517..53de47aba 100644
--- a/nuttx/libc/syslog/lib_lowsyslog.c
+++ b/nuttx/libc/syslog/lib_lowsyslog.c
@@ -39,14 +39,10 @@
 
 #include <nuttx/config.h>
 
-#include <stdio.h>
-#include <debug.h>
+#include <stdarg.h>
+#include <syslog.h>
 
-#include "lib_internal.h"
-
-/* This interface can only be used from within the kernel */
-
-#if !defined(CONFIG_BUILD_PROTECTED) || defined(__KERNEL__)
+#if defined(CONFIG_ARCH_LOWPUTC) || defined(CONFIG_SYSLOG)
 
 /****************************************************************************
  * Pre-processor Definitions
@@ -77,33 +73,17 @@
  ****************************************************************************/
 
 /****************************************************************************
- * Private Variables
+ * Private Data
  ****************************************************************************/
 
 /****************************************************************************
- * Public Functions
+ * Private Functions
  ****************************************************************************/
 
 /****************************************************************************
- * Name: lowvsyslog
+ * Public Functions
  ****************************************************************************/
 
-#if defined(CONFIG_ARCH_LOWPUTC) || defined(CONFIG_SYSLOG)
-
-int lowvsyslog(int priority, FAR const char *fmt, va_list ap)
-{
-  struct lib_outstream_s stream;
-
-  /* Wrap the stdout in a stream object and let lib_vsprintf do the work. */
-
-#ifdef CONFIG_SYSLOG
-  lib_syslogstream((FAR struct lib_outstream_s *)&stream);
-#else
-  lib_lowoutstream((FAR struct lib_outstream_s *)&stream);
-#endif
-  return lib_vsprintf((FAR struct lib_outstream_s *)&stream, fmt, ap);
-}
-
 /****************************************************************************
  * Name: lowsyslog
  ****************************************************************************/
@@ -111,20 +91,15 @@ int lowvsyslog(int priority, FAR const char *fmt, va_list ap)
 int lowsyslog(int priority, FAR const char *fmt, ...)
 {
   va_list ap;
-  int     ret;
-
-#ifdef CONFIG_SYSLOG_ENABLE
-  ret = 0;
-  if (g_syslogenable)
-#endif
-    {
-      va_start(ap, fmt);
-      ret = lowvsyslog(priority, fmt, ap);
-      va_end(ap);
-    }
+  int ret;
+
+  /* Let lowvsyslog do the work */
+
+  va_start(ap, fmt);
+  ret = lowvsyslog(priority, fmt, ap);
+  va_end(ap);
 
   return ret;
 }
 
 #endif /* CONFIG_ARCH_LOWPUTC || CONFIG_SYSLOG */
-#endif /* __KERNEL__ */
diff --git a/nuttx/libc/syslog/lib_syslog.c b/nuttx/libc/syslog/lib_syslog.c
index 21993ecc4..16655a28c 100644
--- a/nuttx/libc/syslog/lib_syslog.c
+++ b/nuttx/libc/syslog/lib_syslog.c
@@ -39,23 +39,13 @@
 
 #include <nuttx/config.h>
 
-#include <stdio.h>
+#include <stdarg.h>
 #include <syslog.h>
 
-#include "lib_internal.h"
-#include "syslog/syslog.h"
-
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
 
-/* Some output destinations are only available from within the kernel */
-
-#if defined(CONFIG_BUILD_PROTECTED) && !defined(__KERNEL__)
-#  undef CONFIG_SYSLOG
-#  undef CONFIG_ARCH_LOWPUTC
-#endif
-
 /****************************************************************************
  * Private Type Declarations
  ****************************************************************************/
@@ -81,57 +71,17 @@
  ****************************************************************************/
 
 /****************************************************************************
- * Private Variables
+ * Private Data
  ****************************************************************************/
 
 /****************************************************************************
- * Public Functions
+ * Private Functions
  ****************************************************************************/
 
 /****************************************************************************
- * Name: vsyslog
+ * Public Functions
  ****************************************************************************/
 
-int vsyslog(int priority, FAR const char *fmt, va_list ap)
-{
-#if defined(CONFIG_SYSLOG)
-
-  struct lib_outstream_s stream;
-
-  /* Wrap the low-level output in a stream object and let lib_vsprintf
-   * do the work.
-   */
-
-  lib_syslogstream((FAR struct lib_outstream_s *)&stream);
-  return lib_vsprintf((FAR struct lib_outstream_s *)&stream, fmt, ap);
-
-#elif CONFIG_NFILE_DESCRIPTORS > 0
-
-  struct lib_rawoutstream_s rawoutstream;
-
-  /* Wrap the stdout in a stream object and let lib_vsprintf
-   * do the work.
-   */
-
-  lib_rawoutstream(&rawoutstream, 1);
-  return lib_vsprintf(&rawoutstream.public, fmt, ap);
-
-#elif defined(CONFIG_ARCH_LOWPUTC)
-
-  struct lib_outstream_s stream;
-
-  /* Wrap the low-level output in a stream object and let lib_vsprintf
-   * do the work.
-   */
-
-  lib_lowoutstream((FAR struct lib_outstream_s *)&stream);
-  return lib_vsprintf((FAR struct lib_outstream_s *)&stream, fmt, ap);
-
-#else
-  return 0;
-#endif
-}
-
 /****************************************************************************
  * Name: syslog
  ****************************************************************************/
@@ -139,17 +89,13 @@ int vsyslog(int priority, FAR const char *fmt, va_list ap)
 int syslog(int priority, FAR const char *fmt, ...)
 {
   va_list ap;
-  int     ret;
-
-#ifdef CONFIG_SYSLOG_ENABLE
-  ret = 0;
-  if (g_syslogenable)
-#endif
-    {
-      va_start(ap, fmt);
-      ret = vsyslog(priority, fmt, ap);
-      va_end(ap);
-    }
+  int ret;
+
+  /* Let vsyslog do the work */
+
+  va_start(ap, fmt);
+  ret = vsyslog(priority, fmt, ap);
+  va_end(ap);
 
   return ret;
 }