diff --git a/arch/arm/src/arm/up_assert.c b/arch/arm/src/arm/up_assert.c
index 3d188174b3d..60ca70b3e06 100644
--- a/arch/arm/src/arm/up_assert.c
+++ b/arch/arm/src/arm/up_assert.c
@@ -1,7 +1,8 @@
 /****************************************************************************
  * arch/arm/src/arm/up_assert.c
  *
- *   Copyright (C) 2007-2010, 2012-2016 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2010, 2012-2016, 2018 Gregory Nutt. All rights
+ *     reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -48,6 +49,7 @@
 #include <nuttx/irq.h>
 #include <nuttx/arch.h>
 #include <nuttx/board.h>
+#include <nuttx/syslog/syslog.h>
 #include <nuttx/usb/usbdev_trace.h>
 
 #include <arch/board/board.h>
@@ -148,12 +150,12 @@ static int usbtrace_syslog(FAR const char *fmt, ...)
   va_list ap;
   int ret;
 
-  /* Let vsyslog do the real work */
+  /* Let nx_vsyslog do the real work */
 
   va_start(ap, fmt);
-  ret = vsyslog(LOG_EMERG, fmt, ap);
+  ret = nx_vsyslog(LOG_EMERG, fmt, &ap);
   va_end(ap);
-  return ret;
+  return OK;
 }
 
 static int assert_tracecallback(FAR struct usbtrace_s *trace, FAR void *arg)
diff --git a/arch/arm/src/armv6-m/up_assert.c b/arch/arm/src/armv6-m/up_assert.c
index f218cd477b0..99c3f2cbae2 100644
--- a/arch/arm/src/armv6-m/up_assert.c
+++ b/arch/arm/src/armv6-m/up_assert.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/arm/src/armv6-m/up_assert.c
  *
- *   Copyright (C) 2013-2015, 2016 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2013-2015, 2016, 2018 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -47,6 +47,7 @@
 #include <nuttx/irq.h>
 #include <nuttx/arch.h>
 #include <nuttx/board.h>
+#include <nuttx/syslog/syslog.h>
 #include <nuttx/usb/usbdev_trace.h>
 
 #include <arch/board/board.h>
@@ -190,10 +191,10 @@ static int usbtrace_syslog(FAR const char *fmt, ...)
   va_list ap;
   int ret;
 
-  /* Let vsyslog do the real work */
+  /* Let nx_vsyslog do the real work */
 
   va_start(ap, fmt);
-  ret = vsyslog(LOG_EMERG, fmt, ap);
+  ret = nx_vsyslog(LOG_EMERG, fmt, &ap);
   va_end(ap);
   return ret;
 }
diff --git a/arch/arm/src/armv7-a/arm_assert.c b/arch/arm/src/armv7-a/arm_assert.c
index 72952e0cfaa..7f1e70e4c9f 100644
--- a/arch/arm/src/armv7-a/arm_assert.c
+++ b/arch/arm/src/armv7-a/arm_assert.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/arm/src/armv7-a/arm_assert.c
  *
- *   Copyright (C) 2013-2016 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2013-2016, 2018 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -47,6 +47,7 @@
 #include <nuttx/irq.h>
 #include <nuttx/arch.h>
 #include <nuttx/board.h>
+#include <nuttx/syslog/syslog.h>
 #include <nuttx/usb/usbdev_trace.h>
 
 #include <arch/board/board.h>
@@ -183,10 +184,10 @@ static int usbtrace_syslog(FAR const char *fmt, ...)
   va_list ap;
   int ret;
 
-  /* Let vsyslog do the real work */
+  /* Let nx_vsyslog do the real work */
 
   va_start(ap, fmt);
-  ret = vsyslog(LOG_EMERG, fmt, ap);
+  ret = nx_vsyslog(LOG_EMERG, fmt, &ap);
   va_end(ap);
   return ret;
 }
diff --git a/arch/arm/src/armv7-m/up_assert.c b/arch/arm/src/armv7-m/up_assert.c
index 11f29cd6534..ab37542a39f 100644
--- a/arch/arm/src/armv7-m/up_assert.c
+++ b/arch/arm/src/armv7-m/up_assert.c
@@ -1,7 +1,8 @@
 /****************************************************************************
  * arch/arm/src/armv7-m/up_assert.c
  *
- *   Copyright (C) 2009-2010, 2012-2016 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009-2010, 2012-2016, 2018 Gregory Nutt. All rights
+ *     reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -47,6 +48,7 @@
 #include <nuttx/irq.h>
 #include <nuttx/arch.h>
 #include <nuttx/board.h>
+#include <nuttx/syslog/syslog.h>
 #include <nuttx/usb/usbdev_trace.h>
 
 #include <arch/board/board.h>
@@ -196,10 +198,10 @@ static int usbtrace_syslog(FAR const char *fmt, ...)
   va_list ap;
   int ret;
 
-  /* Let vsyslog do the real work */
+  /* Let nx_vsyslog do the real work */
 
   va_start(ap, fmt);
-  ret = vsyslog(LOG_EMERG, fmt, ap);
+  ret = nx_vsyslog(LOG_EMERG, fmt, &ap);
   va_end(ap);
   return ret;
 }
diff --git a/arch/arm/src/armv7-r/arm_assert.c b/arch/arm/src/armv7-r/arm_assert.c
index b841416450b..cc5d7187aa7 100644
--- a/arch/arm/src/armv7-r/arm_assert.c
+++ b/arch/arm/src/armv7-r/arm_assert.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/arm/src/armv7-r/arm_assert.c
  *
- *   Copyright (C) 2015-2016 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2015-2016, 2018 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -47,6 +47,7 @@
 #include <nuttx/irq.h>
 #include <nuttx/arch.h>
 #include <nuttx/board.h>
+#include <nuttx/syslog/syslog.h>
 #include <nuttx/usb/usbdev_trace.h>
 
 #include <arch/board/board.h>
@@ -183,10 +184,10 @@ static int usbtrace_syslog(FAR const char *fmt, ...)
   va_list ap;
   int ret;
 
-  /* Let vsyslog do the real work */
+  /* Let nx_vsyslog do the real work */
 
   va_start(ap, fmt);
-  ret = vsyslog(LOG_EMERG, fmt, ap);
+  ret = nx_vsyslog(LOG_EMERG, fmt, &ap);
   va_end(ap);
   return ret;
 }
diff --git a/arch/avr/src/common/up_assert.c b/arch/avr/src/common/up_assert.c
index 92c3bde0175..e7e70bc8864 100644
--- a/arch/avr/src/common/up_assert.c
+++ b/arch/avr/src/common/up_assert.c
@@ -1,7 +1,8 @@
 /****************************************************************************
  * arch/avr/src/common/up_assert.c
  *
- *   Copyright (C) 2010-2011, 2013-2016 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2010-2011, 2013-2016, 2018 Gregory Nutt. All rights
+ *     reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -47,6 +48,7 @@
 #include <nuttx/irq.h>
 #include <nuttx/arch.h>
 #include <nuttx/board.h>
+#include <nuttx/syslog/syslog.h>
 #include <nuttx/usb/usbdev_trace.h>
 
 #include <arch/board/board.h>
@@ -106,10 +108,10 @@ static int usbtrace_syslog(FAR const char *fmt, ...)
   va_list ap;
   int ret;
 
-  /* Let vsyslog do the real work */
+  /* Let nx_vsyslog do the real work */
 
   va_start(ap, fmt);
-  ret = vsyslog(LOG_EMERG, fmt, ap);
+  ret = nx_vsyslog(LOG_EMERG, fmt, &ap);
   va_end(ap);
   return ret;
 }
diff --git a/arch/hc/src/m9s12/m9s12_assert.c b/arch/hc/src/m9s12/m9s12_assert.c
index 496b3933a66..87257f706a9 100644
--- a/arch/hc/src/m9s12/m9s12_assert.c
+++ b/arch/hc/src/m9s12/m9s12_assert.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/hc/src/m9s12/m9s12_assert.c
  *
- *   Copyright (C) 2011-2016 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2011-2016, 2018 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -47,6 +47,7 @@
 #include <nuttx/irq.h>
 #include <nuttx/arch.h>
 #include <nuttx/board.h>
+#include <nuttx/syslog/syslog.h>
 #include <nuttx/usb/usbdev_trace.h>
 
 #include <arch/board/board.h>
@@ -141,10 +142,10 @@ static int usbtrace_syslog(FAR const char *fmt, ...)
   va_list ap;
   int ret;
 
-  /* Let vsyslog do the real work */
+  /* Let nx_vsyslog do the real work */
 
   va_start(ap, fmt);
-  ret = vsyslog(LOG_EMERG, fmt, ap);
+  ret = nx_vsyslog(LOG_EMERG, fmt, &ap);
   va_end(ap);
   return ret;
 }
diff --git a/arch/mips/src/mips32/up_assert.c b/arch/mips/src/mips32/up_assert.c
index 5723fe18405..259d1406198 100644
--- a/arch/mips/src/mips32/up_assert.c
+++ b/arch/mips/src/mips32/up_assert.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/mips/src/mips32/up_assert.c
  *
- *   Copyright (C) 2011-2015 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2011-2015, 2018 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -47,6 +47,7 @@
 #include <nuttx/irq.h>
 #include <nuttx/arch.h>
 #include <nuttx/board.h>
+#include <nuttx/syslog/syslog.h>
 #include <nuttx/usb/usbdev_trace.h>
 
 #include <arch/board/board.h>
@@ -106,10 +107,10 @@ static int usbtrace_syslog(FAR const char *fmt, ...)
   va_list ap;
   int ret;
 
-  /* Let vsyslog do the real work */
+  /* Let nx_vsyslog do the real work */
 
   va_start(ap, fmt);
-  ret = vsyslog(LOG_EMERG, fmt, ap);
+  ret = nx_vsyslog(LOG_EMERG, fmt, &ap);
   va_end(ap);
   return ret;
 }
diff --git a/arch/misoc/src/lm32/lm32_assert.c b/arch/misoc/src/lm32/lm32_assert.c
index 78e7d2b6680..0dfb71126ad 100644
--- a/arch/misoc/src/lm32/lm32_assert.c
+++ b/arch/misoc/src/lm32/lm32_assert.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/misoc/src/lm32/lm32_assert.c
  *
- *   Copyright (C) 2016 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2016, 2018 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *           Ramtin Amin <keytwo@gmail.com>
  *
@@ -48,6 +48,7 @@
 #include <nuttx/irq.h>
 #include <nuttx/arch.h>
 #include <nuttx/board.h>
+#include <nuttx/syslog/syslog.h>
 #include <nuttx/usb/usbdev_trace.h>
 
 #include <arch/board/board.h>
@@ -107,10 +108,10 @@ static int usbtrace_syslog(FAR const char *fmt, ...)
   va_list ap;
   int ret;
 
-  /* Let vsyslog do the real work */
+  /* Let nx_vsyslog do the real work */
 
   va_start(ap, fmt);
-  ret = vsyslog(LOG_EMERG, fmt, ap);
+  ret = nx_vsyslog(LOG_EMERG, fmt, &ap);
   va_end(ap);
   return ret;
 }
diff --git a/arch/renesas/src/common/up_assert.c b/arch/renesas/src/common/up_assert.c
index eaee6f7fec0..682761ff983 100644
--- a/arch/renesas/src/common/up_assert.c
+++ b/arch/renesas/src/common/up_assert.c
@@ -1,7 +1,8 @@
 /****************************************************************************
  * arch/renesas/src/common/up_assert.c
  *
- *   Copyright (C) 2008-2009, 2012-2016 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2008-2009, 2012-2016, 2018 Gregory Nutt. All rights
+ *     reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -47,6 +48,7 @@
 #include <nuttx/irq.h>
 #include <nuttx/arch.h>
 #include <nuttx/board.h>
+#include <nuttx/syslog/syslog.h>
 #include <nuttx/usb/usbdev_trace.h>
 
 #include <nuttx/usb/usbdev_trace.h>
@@ -107,10 +109,10 @@ static int usbtrace_syslog(FAR const char *fmt, ...)
   va_list ap;
   int ret;
 
-  /* Let vsyslog do the real work */
+  /* Let nx_vsyslog do the real work */
 
   va_start(ap, fmt);
-  ret = vsyslog(LOG_EMERG, fmt, ap);
+  ret = nx_vsyslog(LOG_EMERG, fmt, &ap);
   va_end(ap);
   return ret;
 }
diff --git a/arch/risc-v/src/rv32im/up_assert.c b/arch/risc-v/src/rv32im/up_assert.c
index a5edaa54d18..8774e5ec9b9 100644
--- a/arch/risc-v/src/rv32im/up_assert.c
+++ b/arch/risc-v/src/rv32im/up_assert.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/risc-v/src/rv32im/up_assert.c
  *
- *   Copyright (C) 2011-2015 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2011-2015, 2018 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -47,6 +47,7 @@
 #include <nuttx/irq.h>
 #include <nuttx/arch.h>
 #include <nuttx/board.h>
+#include <nuttx/syslog/syslog.h>
 #include <nuttx/usb/usbdev_trace.h>
 
 #include <arch/board/board.h>
@@ -106,10 +107,10 @@ static int usbtrace_syslog(FAR const char *fmt, ...)
   va_list ap;
   int ret;
 
-  /* Let vsyslog do the real work */
+  /* Let nx_vsyslog do the real work */
 
   va_start(ap, fmt);
-  ret = vsyslog(LOG_EMERG, fmt, ap);
+  ret = nx_vsyslog(LOG_EMERG, fmt, &ap);
   va_end(ap);
   return ret;
 }
diff --git a/arch/x86/src/common/up_assert.c b/arch/x86/src/common/up_assert.c
index 7afec4e4bec..3b9d00cac2c 100644
--- a/arch/x86/src/common/up_assert.c
+++ b/arch/x86/src/common/up_assert.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/x86/src/common/up_assert.c
  *
- *   Copyright (C) 2011-2016 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2011-2016, 2018 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -48,6 +48,7 @@
 #include <nuttx/arch.h>
 #include <nuttx/board.h>
 #include <arch/arch.h>
+#include <nuttx/syslog/syslog.h>
 #include <nuttx/usb/usbdev_trace.h>
 
 #include <arch/board/board.h>
@@ -100,10 +101,10 @@ static int usbtrace_syslog(FAR const char *fmt, ...)
   va_list ap;
   int ret;
 
-  /* Let vsyslog do the real work */
+  /* Let nx_vsyslog do the real work */
 
   va_start(ap, fmt);
-  ret = vsyslog(LOG_EMERG, fmt, ap);
+  ret = nx_vsyslog(LOG_EMERG, fmt, &ap);
   va_end(ap);
   return ret;
 }
diff --git a/arch/xtensa/src/common/xtensa_assert.c b/arch/xtensa/src/common/xtensa_assert.c
index e290be637f9..b3379337fe0 100644
--- a/arch/xtensa/src/common/xtensa_assert.c
+++ b/arch/xtensa/src/common/xtensa_assert.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/xtensa/src/common/xtensa_assert.c
  *
- *   Copyright (C) 2016 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2016, 2018 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -47,6 +47,7 @@
 #include <nuttx/irq.h>
 #include <nuttx/arch.h>
 #include <nuttx/board.h>
+#include <nuttx/syslog/syslog.h>
 #include <nuttx/usb/usbdev_trace.h>
 
 #include <arch/board/board.h>
@@ -77,10 +78,10 @@ static int usbtrace_syslog(FAR const char *fmt, ...)
   va_list ap;
   int ret;
 
-  /* Let vsyslog do the real work */
+  /* Let nx_vsyslog do the real work */
 
   va_start(ap, fmt);
-  ret = vsyslog(LOG_EMERG, fmt, ap);
+  ret = nx_vsyslog(LOG_EMERG, fmt, &ap);
   va_end(ap);
   return ret;
 }
diff --git a/arch/z16/src/common/up_assert.c b/arch/z16/src/common/up_assert.c
index 5346e9d48c9..3384969bcf2 100644
--- a/arch/z16/src/common/up_assert.c
+++ b/arch/z16/src/common/up_assert.c
@@ -1,7 +1,8 @@
 /****************************************************************************
  * common/up_assert.c
  *
- *   Copyright (C) 2008-2009, 2012-2016 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2008-2009, 2012-2016, 2018 Gregory Nutt. All rights
+ *     reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -47,6 +48,7 @@
 #include <nuttx/irq.h>
 #include <nuttx/arch.h>
 #include <nuttx/board.h>
+#include <nuttx/syslog/syslog.h>
 #include <nuttx/usb/usbdev_trace.h>
 
 #include <arch/board/board.h>
@@ -106,10 +108,10 @@ static int usbtrace_syslog(FAR const char *fmt, ...)
   va_list ap;
   int ret;
 
-  /* Let vsyslog do the real work */
+  /* Let nx_vsyslog do the real work */
 
   va_start(ap, fmt);
-  ret = vsyslog(LOG_EMERG, fmt, ap);
+  ret = nx_vsyslog(LOG_EMERG, fmt, &ap);
   va_end(ap);
   return ret;
 }
diff --git a/arch/z80/src/common/up_assert.c b/arch/z80/src/common/up_assert.c
index c361386d5f6..7aef249b4c0 100644
--- a/arch/z80/src/common/up_assert.c
+++ b/arch/z80/src/common/up_assert.c
@@ -1,7 +1,8 @@
 /****************************************************************************
  * arch/z80/src/common/up_assert.c
  *
- *   Copyright (C) 2007-2009, 2012-2016 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2009, 2012-2016, 2018 Gregory Nutt. All rights
+ *     reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -47,6 +48,7 @@
 #include <nuttx/irq.h>
 #include <nuttx/arch.h>
 #include <nuttx/board.h>
+#include <nuttx/syslog/syslog.h>
 #include <nuttx/usb/usbdev_trace.h>
 
 #include "chip.h"
@@ -105,10 +107,10 @@ static int usbtrace_syslog(FAR const char *fmt, ...)
   va_list ap;
   int ret;
 
-  /* Let vsyslog do the real work */
+  /* Let nx_vsyslog do the real work */
 
   va_start(ap, fmt);
-  ret = vsyslog(LOG_EMERG, fmt, ap);
+  ret = nx_vsyslog(LOG_EMERG, fmt, &ap);
   va_end(ap);
   return ret;
 }
diff --git a/drivers/syslog/vsyslog.c b/drivers/syslog/vsyslog.c
index 58123331b0a..78a4120e8e8 100644
--- a/drivers/syslog/vsyslog.c
+++ b/drivers/syslog/vsyslog.c
@@ -54,10 +54,10 @@
  ****************************************************************************/
 
 /****************************************************************************
- * Name: _vsyslog
+ * Name: nx_vsyslog
  *
  * Description:
- *   _vsyslog() handles the system logging system calls. It is functionally
+ *   nx_vsyslog() handles the system logging system calls. It is functionally
  *   equivalent to vsyslog() except that (1) the per-process priority
  *   filtering has already been performed and the va_list parameter is
  *   passed by reference.  That is because the va_list is a structure in
@@ -66,7 +66,7 @@
  *
  ****************************************************************************/
 
-int _vsyslog(int priority, FAR const IPTR char *fmt, FAR va_list *ap)
+int nx_vsyslog(int priority, FAR const IPTR char *fmt, FAR va_list *ap)
 {
   struct lib_syslogstream_s stream;
   int ret;
diff --git a/drivers/usbdev/usbdev_trace.c b/drivers/usbdev/usbdev_trace.c
index 857cd3e0294..f1dcaefe835 100644
--- a/drivers/usbdev/usbdev_trace.c
+++ b/drivers/usbdev/usbdev_trace.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * drivers/usbdev/usbdev_trace.c
  *
- *   Copyright (C) 2008-2010, 2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2008-2010, 2012, 2018 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -46,7 +46,9 @@
 #include <debug.h>
 
 #include <nuttx/irq.h>
+#include <nuttx/syslog/syslog.h>
 #include <nuttx/usb/usbdev_trace.h>
+
 #undef usbtrace
 
 /****************************************************************************
@@ -100,10 +102,10 @@ static int usbtrace_syslog(const char *fmt, ...)
   va_list ap;
   int ret;
 
-  /* Let vsyslog do the real work */
+  /* Let nx_vsyslog do the real work */
 
   va_start(ap, fmt);
-  ret = vsyslog(LOG_INFO, fmt, ap);
+  ret = nx_vsyslog(LOG_INFO, fmt, &ap);
   va_end(ap);
   return ret;
 }
diff --git a/drivers/usbmonitor/usbmonitor.c b/drivers/usbmonitor/usbmonitor.c
index 548c39b7499..f7e133eb7fa 100644
--- a/drivers/usbmonitor/usbmonitor.c
+++ b/drivers/usbmonitor/usbmonitor.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * drivers/usbmonitor/usbmonitor.c
  *
- *   Copyright (C) 2013, 2016-2017 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2013, 2016-2018 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -50,6 +50,7 @@
 
 #include <nuttx/signal.h>
 #include <nuttx/kthread.h>
+#include <nuttx/syslog/syslog.h>
 #include <nuttx/usb/usbdev_trace.h>
 #include <nuttx/usb/usbhost_trace.h>
 
@@ -144,10 +145,10 @@ static int usbtrace_syslog(FAR const char *fmt, ...)
   va_list ap;
   int ret;
 
-  /* Let vsyslog do the real work */
+  /* Let nx_vsyslog do the real work */
 
   va_start(ap, fmt);
-  ret = vsyslog(LOG_INFO, fmt, ap);
+  ret = nx_vsyslog(LOG_INFO, fmt, &ap);
   va_end(ap);
   return ret;
 }
diff --git a/include/debug.h b/include/debug.h
index d7fe4ff642f..f4759c7c833 100644
--- a/include/debug.h
+++ b/include/debug.h
@@ -1572,19 +1572,19 @@ void lib_dumpbuffer(FAR const char *msg, FAR const uint8_t *buffer,
 
 #ifndef CONFIG_CPP_HAVE_VARARGS
 #ifdef CONFIG_DEBUG_ALERT
-int _alert(const char *format, ...);
+void _alert(const char *format, ...);
 #endif
 
 #ifdef CONFIG_DEBUG_ERROR
-int  _err(const char *format, ...);
+void _err(const char *format, ...);
 #endif
 
 #ifdef CONFIG_DEBUG_WARN
-int _warn(const char *format, ...);
+void _warn(const char *format, ...);
 #endif
 
 #ifdef CONFIG_DEBUG_INFO
-int _info(const char *format, ...);
+void _info(const char *format, ...);
 #endif
 #endif /* CONFIG_CPP_HAVE_VARARGS */
 
diff --git a/include/nuttx/syslog/syslog.h b/include/nuttx/syslog/syslog.h
index 1ea41be2ef3..ced488cfb6a 100644
--- a/include/nuttx/syslog/syslog.h
+++ b/include/nuttx/syslog/syslog.h
@@ -263,10 +263,10 @@ int syslog_flush(void);
 #endif
 
 /****************************************************************************
- * Name: _vsyslog
+ * Name: nx_vsyslog
  *
  * Description:
- *   _vsyslog() handles the system logging system calls. It is functionally
+ *   nx_vsyslog() handles the system logging system calls. It is functionally
  *   equivalent to vsyslog() except that (1) the per-process priority
  *   filtering has already been performed and the va_list parameter is
  *   passed by reference.  That is because the va_list is a structure in
@@ -275,7 +275,7 @@ int syslog_flush(void);
  *
  ****************************************************************************/
 
-int _vsyslog(int priority, FAR const IPTR char *src, FAR va_list *ap);
+int nx_vsyslog(int priority, FAR const IPTR char *src, FAR va_list *ap);
 
 /****************************************************************************
  * Name: syslog_register
diff --git a/include/sys/syscall.h b/include/sys/syscall.h
index c79dca741bc..d0223e9799a 100644
--- a/include/sys/syscall.h
+++ b/include/sys/syscall.h
@@ -263,7 +263,7 @@
 
 /* Unconditional system logging */
 
-#define SYS__vsyslog                   (__SYS_syslog+0)
+#define SYS_nx_vsyslog                 (__SYS_syslog+0)
 #define __SYS_descriptors              (__SYS_syslog+1)
 
 /* The following are defined if either file or socket descriptor are
diff --git a/include/syslog.h b/include/syslog.h
index 59f1301fb49..bb05f26afd3 100644
--- a/include/syslog.h
+++ b/include/syslog.h
@@ -1,7 +1,7 @@
 /****************************************************************************
  * include/syslog.h
  *
- *   Copyright (C) 2013-2014 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2013-2014, 2018 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -212,8 +212,8 @@ void closelog(void);
  *
  ****************************************************************************/
 
-int syslog(int priority, FAR const IPTR char *fmt, ...);
-int vsyslog(int priority, FAR const IPTR char *fmt, va_list ap);
+void syslog(int priority, FAR const IPTR char *fmt, ...);
+void vsyslog(int priority, FAR const IPTR char *fmt, va_list ap);
 
 /****************************************************************************
  * Name: setlogmask
diff --git a/libc/misc/lib_debug.c b/libc/misc/lib_debug.c
index 098f3cc2dd7..75815ef2077 100644
--- a/libc/misc/lib_debug.c
+++ b/libc/misc/lib_debug.c
@@ -1,7 +1,8 @@
 /****************************************************************************
  * libc/misc/lib_err.c
  *
- *   Copyright (C) 2007-2009, 2011-2012, 2016 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2009, 2011-2012, 2016, 2018 Gregory Nutt. All rights
+ *     reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -60,58 +61,46 @@
  ****************************************************************************/
 
 #ifdef CONFIG_DEBUG_ALERT
-int _alert(const char *format, ...)
+void _alert(const char *format, ...)
 {
   va_list ap;
-  int     ret;
 
   va_start(ap, format);
-  ret = vsyslog(LOG_EMERG, format, ap);
+  vsyslog(LOG_EMERG, format, ap);
   va_end(ap);
-
-  return ret;
 }
 #endif /* CONFIG_DEBUG_ALERT */
 
 #ifdef CONFIG_DEBUG_ERROR
-int  _err(const char *format, ...)
+void _err(const char *format, ...)
 {
   va_list ap;
-  int     ret;
 
   va_start(ap, format);
-  ret = vsyslog(LOG_ERR, format, ap);
+  vsyslog(LOG_ERR, format, ap);
   va_end(ap);
-
-  return ret;
 }
 #endif /* CONFIG_DEBUG_ERROR */
 
 #ifdef CONFIG_DEBUG_WARN
-int _warn(const char *format, ...)
+void _warn(const char *format, ...)
 {
   va_list ap;
-  int     ret;
 
   va_start(ap, format);
-  ret = vsyslog(LOG_WARNING, format, ap);
+  vsyslog(LOG_WARNING, format, ap);
   va_end(ap);
-
-  return ret;
 }
 #endif /* CONFIG_DEBUG_WARN */
 
 #ifdef CONFIG_DEBUG_INFO
-int _info(const char *format, ...)
+void _info(const char *format, ...)
 {
   va_list ap;
-  int     ret;
 
   va_start(ap, format);
-  ret = vsyslog(LOG_INFO, format, ap);
+  vsyslog(LOG_INFO, format, ap);
   va_end(ap);
-
-  return ret;
 }
 #endif /* CONFIG_DEBUG_INFO */
 
diff --git a/libc/stdio/lib_printf.c b/libc/stdio/lib_printf.c
index 7c3e460b975..265e2fd26b5 100644
--- a/libc/stdio/lib_printf.c
+++ b/libc/stdio/lib_printf.c
@@ -1,7 +1,8 @@
 /****************************************************************************
  * libc/stdio/lib_printf.c
  *
- *   Copyright (C) 2007-2008, 2011-2012, 2014, 2016 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2008, 2011-2012, 2014, 2016, 2018 Gregory Nutt. All
+ *     rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -40,6 +41,8 @@
 #include <stdio.h>
 #include <syslog.h>
 
+#include <nuttx/syslog/syslog.h>
+
 #include "libc.h"
 
 /****************************************************************************
@@ -59,7 +62,7 @@ int printf(FAR const IPTR char *fmt, ...)
 #if CONFIG_NFILE_STREAMS > 0
   ret = vfprintf(stdout, fmt, ap);
 #else
-  ret = vsyslog(LOG_INFO, fmt, ap);
+  ret = nx_vsyslog(LOG_INFO, fmt, &ap);
 #endif
   va_end(ap);
 
diff --git a/libc/syslog/lib_syslog.c b/libc/syslog/lib_syslog.c
index 408ffc10015..be12bce0a2f 100644
--- a/libc/syslog/lib_syslog.c
+++ b/libc/syslog/lib_syslog.c
@@ -1,7 +1,8 @@
 /****************************************************************************
  * libc/syslog/lib_syslog.c
  *
- *   Copyright (C) 2007-2009, 2011-2014, 2016 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2009, 2011-2014, 2016, 2018 Gregory Nutt. All rights
+ *     reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -57,27 +58,26 @@
  *   difference that it takes a set of arguments which have been obtained
  *   using the stdarg variable argument list macros.
  *
+ * Returned Value:
+ *   None.
+ *
  ****************************************************************************/
 
-int vsyslog(int priority, FAR const IPTR char *fmt, va_list ap)
+void vsyslog(int priority, FAR const IPTR char *fmt, va_list ap)
 {
-  int ret = 0;
-
   /* Check if this priority is enabled */
 
   if ((g_syslog_mask & LOG_MASK(priority)) != 0)
     {
-      /* Yes.. Perform the _vsyslog system call.
+      /* Yes.. Perform the nx_vsyslog system call.
        *
        * NOTE:  The va_list parameter is passed by reference.  That is
        * because the va_list is a structure in some compilers and passing
        * of structures in the NuttX sycalls does not work.
        */
 
-      ret = _vsyslog(priority, fmt, &ap);
+      (void)nx_vsyslog(priority, fmt, &ap);
     }
-
-  return ret;
 }
 
 /****************************************************************************
@@ -92,18 +92,18 @@ int vsyslog(int priority, FAR const IPTR char *fmt, va_list ap)
  *   The NuttX implementation does not support any special formatting
  *   characters beyond those supported by printf.
  *
+ * Returned Value:
+ *   None.
+ *
  ****************************************************************************/
 
-int syslog(int priority, FAR const IPTR char *fmt, ...)
+void syslog(int priority, FAR const IPTR char *fmt, ...)
 {
   va_list ap;
-  int ret;
 
   /* Let vsyslog do the work */
 
   va_start(ap, fmt);
-  ret = vsyslog(priority, fmt, ap);
+  vsyslog(priority, fmt, ap);
   va_end(ap);
-
-  return ret;
 }
diff --git a/syscall/syscall.csv b/syscall/syscall.csv
index ccec8647eda..f7330684f86 100644
--- a/syscall/syscall.csv
+++ b/syscall/syscall.csv
@@ -56,6 +56,7 @@
 "mq_timedreceive","mqueue.h","!defined(CONFIG_DISABLE_MQUEUE)","ssize_t","mqd_t","char*","size_t","int*","const struct timespec*"
 "mq_timedsend","mqueue.h","!defined(CONFIG_DISABLE_MQUEUE)","int","mqd_t","const char*","size_t","int","const struct timespec*"
 "mq_unlink","mqueue.h","!defined(CONFIG_DISABLE_MQUEUE)","int","const char*"
+"nx_vsyslog","nuttx/syslog/syslog.h","","int","int","FAR const IPTR char*","FAR va_list*"
 "on_exit","stdlib.h","defined(CONFIG_SCHED_ONEXIT)","int","CODE void (*)(int, FAR void *)","FAR void *"
 "open","fcntl.h","CONFIG_NFILE_DESCRIPTORS > 0","int","const char*","int","..."
 "opendir","dirent.h","CONFIG_NFILE_DESCRIPTORS > 0","FAR DIR*","FAR const char*"
@@ -168,7 +169,6 @@
 "up_assert","assert.h","","void","FAR const uint8_t*","int"
 #"up_assert","assert.h","","void"
 "vfork","unistd.h","defined(CONFIG_ARCH_HAVE_VFORK)","pid_t"
-"_vsyslog","nuttx/syslog/syslog.h","","int","int","FAR const IPTR char*","FAR va_list*"
 "wait","sys/wait.h","defined(CONFIG_SCHED_WAITPID) && defined(CONFIG_SCHED_HAVE_PARENT)","pid_t","int*"
 "waitid","sys/wait.h","defined(CONFIG_SCHED_WAITPID) && defined(CONFIG_SCHED_HAVE_PARENT)","int","idtype_t","id_t"," FAR siginfo_t *","int"
 "waitpid","sys/wait.h","defined(CONFIG_SCHED_WAITPID)","pid_t","pid_t","int*","int"
diff --git a/syscall/syscall_lookup.h b/syscall/syscall_lookup.h
index e9a920c4e39..d8c4e91b416 100644
--- a/syscall/syscall_lookup.h
+++ b/syscall/syscall_lookup.h
@@ -1,7 +1,7 @@
 /****************************************************************************
  * syscall/syscall_lookup.h
  *
- *   Copyright (C) 2011, 2013-2017 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2011, 2013-2018 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -184,7 +184,7 @@ SYSCALL_LOOKUP(up_assert,                  2, STUB_up_assert)
 
 /* System logging */
 
-  SYSCALL_LOOKUP(_vsyslog,                 3, STUB__vsyslog)
+  SYSCALL_LOOKUP(nx_vsyslog,               3, STUB_nx_vsyslog)
 
 /* The following are defined if either file or socket descriptor are
  * enabled.
diff --git a/syscall/syscall_stublookup.c b/syscall/syscall_stublookup.c
index 3db4ab90a0d..f6326e3bb14 100644
--- a/syscall/syscall_stublookup.c
+++ b/syscall/syscall_stublookup.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * syscall/syscall_stublookup.c
  *
- *   Copyright (C) 2011-2013, 2015-2017 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2011-2013, 2015-2018 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -178,7 +178,7 @@ uintptr_t STUB_timer_settime(int nbr, uintptr_t parm1, uintptr_t parm2,
 
 /* System logging */
 
-uintptr_t STUB__vsyslog(int nbr, uintptr_t parm1, uintptr_t parm2,
+uintptr_t STUB_nx_vsyslog(int nbr, uintptr_t parm1, uintptr_t parm2,
             uintptr_t parm3);
 
 /* The following are defined if either file or socket descriptor are