diff --git a/examples/elf/elf_main.c b/examples/elf/elf_main.c
index 7e5ff2074..0b72f61ca 100644
--- a/examples/elf/elf_main.c
+++ b/examples/elf/elf_main.c
@@ -107,7 +107,7 @@
 #ifdef CONFIG_CPP_HAVE_VARARGS
 #  ifdef CONFIG_DEBUG_FEATURES
 #    define message(format, ...)    info(format, ##__VA_ARGS__)
-#    define errmsg(format, ...)     err(format, ##__VA_ARGS__)
+#    define errmsg(format, ...)    _err(format, ##__VA_ARGS__)
 #  else
 #    define message(format, ...)    printf(format, ##__VA_ARGS__)
 #    define errmsg(format, ...)     fprintf(stderr, format, ##__VA_ARGS__)
@@ -115,7 +115,7 @@
 #else
 #  ifdef CONFIG_DEBUG_FEATURES
 #    define message                 info
-#    define errmsg                  err
+#    define errmsg                 _err
 #  else
 #    define message                 printf
 #    define errmsg                  printf
diff --git a/examples/helloxx/helloxx_main.cxx b/examples/helloxx/helloxx_main.cxx
index 95dcfdcda..1e6a5dbb7 100644
--- a/examples/helloxx/helloxx_main.cxx
+++ b/examples/helloxx/helloxx_main.cxx
@@ -63,7 +63,7 @@
 #endif
 
 #ifdef CONFIG_DEBUG_CXX
-#  define cxxdbg              err
+#  define cxxdbg             _err
 #  define cxxllerr            llerr
 #  ifdef CONFIG_DEBUG_INFO
 #    define cxxinfo           info
diff --git a/examples/ltdc/dma2d.c b/examples/ltdc/dma2d.c
index deceea121..ee17a7442 100644
--- a/examples/ltdc/dma2d.c
+++ b/examples/ltdc/dma2d.c
@@ -92,7 +92,7 @@ static FAR struct dma2d_surface *ltdc_create_dma2d_surface(uint16_t xres,
 
       if (!sur->dma2d)
         {
-          err("ERROR: up_dma2dcreatelayer failed\n");
+         _err("ERROR: up_dma2dcreatelayer failed\n");
           free(sur);
           sur = NULL;
         }
@@ -102,7 +102,7 @@ static FAR struct dma2d_surface *ltdc_create_dma2d_surface(uint16_t xres,
 
           if (ret != OK)
             {
-              err("ERROR: getvideoinfo() failed\n");
+             _err("ERROR: getvideoinfo() failed\n");
             }
           else
             {
@@ -110,7 +110,7 @@ static FAR struct dma2d_surface *ltdc_create_dma2d_surface(uint16_t xres,
 
               if (ret != OK)
                 {
-                  err("ERROR: getplaneinfo() failed\n");
+                 _err("ERROR: getplaneinfo() failed\n");
                 }
             }
 
@@ -419,7 +419,7 @@ static void ltdc_dma2d_interface(void)
 
   if (ret != OK)
     {
-      err("ERROR: setalpha() failed\n");
+     _err("ERROR: setalpha() failed\n");
       _exit(1);
     }
 
@@ -429,7 +429,7 @@ static void ltdc_dma2d_interface(void)
 
   if (ret != OK  || alpha != 127)
     {
-      err("ERROR: getalpha() failed\n");
+     _err("ERROR: getalpha() failed\n");
       _exit(1);
     }
 
@@ -439,7 +439,7 @@ static void ltdc_dma2d_interface(void)
 
   if (ret != OK)
     {
-      err("ERROR: setblendmode() failed\n");
+     _err("ERROR: setblendmode() failed\n");
       _exit(1);
     }
 
@@ -449,7 +449,7 @@ static void ltdc_dma2d_interface(void)
 
   if (ret != OK  || blendmode != DMA2D_BLEND_ALPHA)
     {
-      err("ERROR: getblendmode() failed\n");
+     _err("ERROR: getblendmode() failed\n");
       _exit(1);
     }
 
@@ -475,7 +475,7 @@ static void ltdc_dma2d_interface(void)
 
       if (ret != OK)
         {
-          err("ERROR: ltdc getclut() failed\n");
+         _err("ERROR: ltdc getclut() failed\n");
           _exit(1);
         }
 
@@ -499,7 +499,7 @@ static void ltdc_dma2d_interface(void)
 
       if (ret != OK)
         {
-          err("ERROR: getclut() failed\n");
+         _err("ERROR: getclut() failed\n");
           _exit(1);
         }
 
@@ -515,7 +515,7 @@ static void ltdc_dma2d_interface(void)
 
       if (ret != OK)
         {
-          err("ERROR: setclut() failed\n");
+         _err("ERROR: setclut() failed\n");
           _exit(1);
         }
 
@@ -523,7 +523,7 @@ static void ltdc_dma2d_interface(void)
 
       if (ret != OK)
         {
-          err("ERROR: getclut() failed\n");
+         _err("ERROR: getclut() failed\n");
           _exit(1);
         }
 
@@ -538,7 +538,7 @@ static void ltdc_dma2d_interface(void)
            memcmp(cmap->red, cmap->green, 256))
 #endif
         {
-          err("ERROR: unexpected clut content\n");
+         _err("ERROR: unexpected clut content\n");
           _exit(1);
         }
 
@@ -548,7 +548,7 @@ static void ltdc_dma2d_interface(void)
 
       if (ret != OK)
         {
-          err("ERROR: ltdc getclut() failed\n");
+         _err("ERROR: ltdc getclut() failed\n");
           _exit(1);
         }
 
@@ -563,7 +563,7 @@ static void ltdc_dma2d_interface(void)
            memcmp(cmap->red, cmap->green, 256))
 #endif
         {
-          err("ERROR: unexpected clut content\n");
+         _err("ERROR: unexpected clut content\n");
           _exit(1);
         }
 
@@ -575,7 +575,7 @@ static void ltdc_dma2d_interface(void)
 
       if (ret != OK)
         {
-          err("ERROR: ltdc setclut() failed\n");
+         _err("ERROR: ltdc setclut() failed\n");
           _exit(1);
         }
 
@@ -585,7 +585,7 @@ static void ltdc_dma2d_interface(void)
 
       if (ret != OK)
         {
-          err("ERROR: getclut() failed\n");
+         _err("ERROR: getclut() failed\n");
           _exit(1);
         }
 
@@ -600,7 +600,7 @@ static void ltdc_dma2d_interface(void)
            memcmp(cmap->blue, cmapltdc->blue, LTDC_EXAMPLE_NCOLORS))
 #endif
         {
-          err("ERROR: clut of ltdc layer and related dma2d layer are different\n");
+         _err("ERROR: clut of ltdc layer and related dma2d layer are different\n");
           _exit(1);
         }
       else
@@ -617,7 +617,7 @@ static void ltdc_dma2d_interface(void)
 
       if (ret == OK)
         {
-          err("ERROR: setclut() failed, expected error if first color exceeds 256\n");
+         _err("ERROR: setclut() failed, expected error if first color exceeds 256\n");
         }
       else
         {
@@ -630,7 +630,7 @@ static void ltdc_dma2d_interface(void)
 
       if (ret == OK)
         {
-          err("ERROR: getclut() failed, expected error if first color exceeds 256\n");
+         _err("ERROR: getclut() failed, expected error if first color exceeds 256\n");
         }
       else
         {
@@ -645,7 +645,7 @@ static void ltdc_dma2d_interface(void)
 
       if (ret != OK)
         {
-          err("ERROR: ltdc setclut() failed\n");
+         _err("ERROR: ltdc setclut() failed\n");
           _exit(1);
         }
 
@@ -706,7 +706,7 @@ static void ltdc_dma2d_fillarea(void)
     }
   else
     {
-      err("ERROR: fail, wrong positioning can overflow layer buffer\n");
+     _err("ERROR: fail, wrong positioning can overflow layer buffer\n");
     }
 
   info("check if the dma2d driver recognized when positioning overflows the"
@@ -731,7 +731,7 @@ static void ltdc_dma2d_fillarea(void)
     }
   else
     {
-      err("ERROR: fail, wrong positioning can overflow layer buffer\n");
+     _err("ERROR: fail, wrong positioning can overflow layer buffer\n");
     }
 
   /* Flip with non blend */
@@ -1462,7 +1462,7 @@ static void ltdc_dma2d_blitdynamiclayer(void)
     }
   else
     {
-      err("ERROR: fail, wrong positioning can overflow layer buffer\n");
+     _err("ERROR: fail, wrong positioning can overflow layer buffer\n");
     }
 
   info("check if the dma2d driver recognized when positioning overflows the"
@@ -1506,7 +1506,7 @@ static void ltdc_dma2d_blitdynamiclayer(void)
     }
   else
     {
-      err("ERROR: fail, wrong positioning can overflow layer buffer\n");
+     _err("ERROR: fail, wrong positioning can overflow layer buffer\n");
     }
 
   /* Initialize the dma2d fullscreen background layer */
@@ -1750,7 +1750,7 @@ static void ltdc_dma2d_blenddynamiclayer(void)
     }
   else
     {
-      err("ERROR: fail, wrong positioning can overflow layer buffer\n");
+     _err("ERROR: fail, wrong positioning can overflow layer buffer\n");
     }
 
   info("check if the dma2d driver recognized when positioning overflows the"
@@ -1810,7 +1810,7 @@ static void ltdc_dma2d_blenddynamiclayer(void)
     }
   else
     {
-      err("ERROR: fail, wrong positioning can overflow layer buffer\n");
+     _err("ERROR: fail, wrong positioning can overflow layer buffer\n");
     }
 
   /* Initialize the dma2d fullscreen background layer */
diff --git a/examples/ltdc/ltdc_main.c b/examples/ltdc/ltdc_main.c
index d6db6d4f9..f95240523 100644
--- a/examples/ltdc/ltdc_main.c
+++ b/examples/ltdc/ltdc_main.c
@@ -96,19 +96,19 @@ static int ltdc_init_surface(int lid, uint32_t mode)
 
   if (!sur->layer)
     {
-      err("ERROR: up_ltdcgetlayer() failed\n");
+     _err("ERROR: up_ltdcgetlayer() failed\n");
       return -1;
     }
 
   if (sur->layer->getvideoinfo(sur->layer, &sur->vinfo) != OK)
     {
-      err("ERROR: getvideoinfo() failed\n");
+     _err("ERROR: getvideoinfo() failed\n");
       return -1;
     }
 
   if (sur->layer->getplaneinfo(sur->layer, 0, &sur->pinfo) != OK)
     {
-      err("ERROR: getplaneinfo() failed\n");
+     _err("ERROR: getplaneinfo() failed\n");
       return -1;
     }
 
@@ -133,7 +133,7 @@ static int ltdc_init_surface(int lid, uint32_t mode)
 
   if (sur->layer->getlid(sur->layer, &lid, LTDC_LAYER_DMA2D) != OK)
     {
-      err("ERROR: getlid() failed\n");
+     _err("ERROR: getlid() failed\n");
       return -1;
     }
 
@@ -141,7 +141,7 @@ static int ltdc_init_surface(int lid, uint32_t mode)
 
   if (sur->dma2d == NULL)
     {
-      err("ERROR: up_dma2dgetlayer() failed\n");
+     _err("ERROR: up_dma2dgetlayer() failed\n");
       return -1;
     }
 #endif
@@ -176,14 +176,14 @@ static void ltdc_setget_test(void)
 
   if (ret != OK)
     {
-      err("ERROR: setalpha() failed\n");
+     _err("ERROR: setalpha() failed\n");
     }
 
   ret = sur->layer->getalpha(sur->layer, &alpha);
 
   if (ret != OK || alpha != 0x7f)
     {
-      err("ERROR: getalpha() failed\n");
+     _err("ERROR: getalpha() failed\n");
     }
 
   /* setcolor */
@@ -192,14 +192,14 @@ static void ltdc_setget_test(void)
 
   if (ret != OK)
     {
-      err("ERROR: setcolor() failed\n");
+     _err("ERROR: setcolor() failed\n");
     }
 
   ret = sur->layer->getcolor(sur->layer, &color);
 
   if (ret != OK || color != 0x11223344)
     {
-      err("ERROR: getcolor() failed\n");
+     _err("ERROR: getcolor() failed\n");
     }
 
   /* setcolorkey */
@@ -208,14 +208,14 @@ static void ltdc_setget_test(void)
 
   if (ret != OK)
     {
-      err("ERROR: setcolorkey() failed\n");
+     _err("ERROR: setcolorkey() failed\n");
     }
 
   ret = sur->layer->getcolorkey(sur->layer, &color);
 
   if (ret != OK || color != 0x55667788)
     {
-      err("ERROR: getcolorkey() failed\n");
+     _err("ERROR: getcolorkey() failed\n");
     }
 
   /* setblendmode */
@@ -224,14 +224,14 @@ static void ltdc_setget_test(void)
 
   if (ret != OK)
     {
-      err("ERROR: setblendmode() failed\n");
+     _err("ERROR: setblendmode() failed\n");
     }
 
   ret = sur->layer->getblendmode(sur->layer, &mode);
 
   if (ret != OK || mode != LTDC_BLEND_NONE)
     {
-      err("ERROR: getblendmode() failed\n");
+     _err("ERROR: getblendmode() failed\n");
     }
 
   /* setarea */
@@ -246,7 +246,7 @@ static void ltdc_setget_test(void)
 
   if (ret != OK)
     {
-      err("ERROR: setarea() failed\n");
+     _err("ERROR: setarea() failed\n");
     }
 
   ret = sur->layer->getarea(sur->layer, &area, &xpos, &ypos);
@@ -255,7 +255,7 @@ static void ltdc_setget_test(void)
       area.xpos != sur->vinfo.xres/4 || area.ypos != sur->vinfo.yres/4 ||
       area.xres != sur->vinfo.xres/2 || area.yres != sur->vinfo.yres/2)
     {
-      err("ERROR: getarea() failed\n");
+     _err("ERROR: getarea() failed\n");
     }
 
 #ifdef CONFIG_FB_CMAP
@@ -275,7 +275,7 @@ static void ltdc_setget_test(void)
 
       if (ret != OK)
         {
-          err("ERROR: setclut() failed\n");
+         _err("ERROR: setclut() failed\n");
         }
 
       /* Clear all colors to black */
@@ -291,7 +291,7 @@ static void ltdc_setget_test(void)
 
       if (ret != OK)
         {
-          err("ERROR: getclut() failed\n");
+         _err("ERROR: getclut() failed\n");
         }
 
 #ifdef CONFIG_FB_TRANSPARENCY
@@ -305,7 +305,7 @@ static void ltdc_setget_test(void)
              ltdc_cmpcolor(g_cmap.green, cmap->green, LTDC_EXAMPLE_NCOLORS))
 #endif
         {
-          err("ERROR: getclut() failed, unexpected cmap content\n");
+         _err("ERROR: getclut() failed, unexpected cmap content\n");
         }
 
       ltdc_deletecmap(cmap);
@@ -318,7 +318,7 @@ static void ltdc_setget_test(void)
 
       if (ret != OK)
         {
-          err("ERROR: setclut() failed\n");
+         _err("ERROR: setclut() failed\n");
         }
     }
 #endif
@@ -1728,7 +1728,7 @@ FAR struct fb_cmap_s * ltdc_createcmap(uint16_t ncolors)
 
       if (!clut)
         {
-          err("ERROR: malloc() failed\n");
+         _err("ERROR: malloc() failed\n");
           free(cmap);
           return NULL;;
         }
@@ -1805,7 +1805,7 @@ uint32_t ltdc_color(FAR struct fb_videoinfo_s *vinfo, uint8_t color)
           break;
 #endif
         default:
-          err("ERROR: Unsupported pixel format %d\n", vinfo->fmt);
+         _err("ERROR: Unsupported pixel format %d\n", vinfo->fmt);
           value = 0;
           break;
     }
@@ -2059,13 +2059,13 @@ struct surface * ltdc_get_surface(uint32_t mode)
 
   if (ret != OK)
     {
-      err("ERROR: getlid() failed\n");
+     _err("ERROR: getlid() failed\n");
       _exit(1);
     }
 
   if (lid < 0 || lid > 1)
     {
-      err("ERROR: invalid layer id %d\n", lid);
+     _err("ERROR: invalid layer id %d\n", lid);
       _exit(1);
     }
 
@@ -2086,7 +2086,7 @@ int ltdc_main(int argc, char *argv[])
 
   if (up_fbinitialize(0) < 0)
     {
-      err("ERROR: up_fbinitialize() failed\n");
+     _err("ERROR: up_fbinitialize() failed\n");
       return -1;
     }
 
@@ -2094,19 +2094,19 @@ int ltdc_main(int argc, char *argv[])
 
   if (!fbtable)
     {
-      err("ERROR: up_fbgetvplane() failed\n");
+     _err("ERROR: up_fbgetvplane() failed\n");
       return -1;
     }
 
   if (fbtable->getvideoinfo(fbtable, &vinfo)<0)
     {
-      err("ERROR: getvideoinfo failed\n");
+     _err("ERROR: getvideoinfo failed\n");
       return -1;
     }
 
   if (fbtable->getplaneinfo(fbtable, 0, &pinfo)<0)
     {
-      err("ERROR: getplaneinfo failed\n");
+     _err("ERROR: getplaneinfo failed\n");
       return -1;
     }
 
@@ -2122,7 +2122,7 @@ int ltdc_main(int argc, char *argv[])
     {
       if (fbtable->putcmap(fbtable, &g_cmap) != OK)
         {
-          err("ERROR: putcmap() failed\n");
+         _err("ERROR: putcmap() failed\n");
           return -1;
         }
     }
diff --git a/examples/nxflat/nxflat_main.c b/examples/nxflat/nxflat_main.c
index be4081041..b742959d5 100644
--- a/examples/nxflat/nxflat_main.c
+++ b/examples/nxflat/nxflat_main.c
@@ -103,7 +103,7 @@
 #ifdef CONFIG_CPP_HAVE_VARARGS
 #  ifdef CONFIG_DEBUG_FEATURES
 #    define message(format, ...)    info(format, ##__VA_ARGS__)
-#    define errmsg(format, ...)     err(format, ##__VA_ARGS__)
+#    define errmsg(format, ...)    _err(format, ##__VA_ARGS__)
 #  else
 #    define message(format, ...)    printf(format, ##__VA_ARGS__)
 #    define errmsg(format, ...)     fprintf(stderr, format, ##__VA_ARGS__)
@@ -111,7 +111,7 @@
 #else
 #  ifdef CONFIG_DEBUG_FEATURES
 #    define message                 info
-#    define errmsg                  err
+#    define errmsg                 _err
 #  else
 #    define message                 printf
 #    define errmsg                  printf
diff --git a/examples/pca9635/pca9635_main.c b/examples/pca9635/pca9635_main.c
index 7584fdb0e..c8bdf939b 100644
--- a/examples/pca9635/pca9635_main.c
+++ b/examples/pca9635/pca9635_main.c
@@ -98,7 +98,7 @@ int pca9635_main(int argc, char *argv[])
               ret = ioctl(fd, PWMIOC_SETLED_BRIGHTNESS, (unsigned long)&ledbright);
               if (ret < 0)
                 {
-                  err("ERROR: ioctl(PWMIOC_SETLED_BRIGHTNESS) failed: %d\n", errno);
+                 _err("ERROR: ioctl(PWMIOC_SETLED_BRIGHTNESS) failed: %d\n", errno);
                 }
             }
 
diff --git a/examples/posix_spawn/spawn_main.c b/examples/posix_spawn/spawn_main.c
index 577a4793c..9212060f7 100644
--- a/examples/posix_spawn/spawn_main.c
+++ b/examples/posix_spawn/spawn_main.c
@@ -110,7 +110,7 @@
 #ifdef CONFIG_CPP_HAVE_VARARGS
 #  ifdef CONFIG_DEBUG_FEATURES
 #    define message(format, ...)    info(format, ##__VA_ARGS__)
-#    define errmsg(format, ...)     err(format, ##__VA_ARGS__)
+#    define errmsg(format, ...)    _err(format, ##__VA_ARGS__)
 #  else
 #    define message(format, ...)    printf(format, ##__VA_ARGS__)
 #    define errmsg(format, ...)     fprintf(stderr, format, ##__VA_ARGS__)
@@ -118,7 +118,7 @@
 #else
 #  ifdef CONFIG_DEBUG_FEATURES
 #    define message                 info
-#    define errmsg                  err
+#    define errmsg                 _err
 #  else
 #    define message                 printf
 #    define errmsg                  printf
diff --git a/netutils/pppd/pppd.c b/netutils/pppd/pppd.c
index 64e272740..eef3fb0cc 100644
--- a/netutils/pppd/pppd.c
+++ b/netutils/pppd/pppd.c
@@ -102,7 +102,8 @@ static int make_nonblock(int fd)
 static int tun_alloc(char *dev)
 {
   struct ifreq ifr;
-  int fd, err;
+  int fd;
+  int errcode;
 
   if ((fd = open("/dev/tun", O_RDWR)) < 0)
     {
@@ -111,10 +112,10 @@ static int tun_alloc(char *dev)
 
   printf("tun fd:%i\n", fd);
 
-  if ((err = make_nonblock(fd)) < 0)
+  if ((errcode = make_nonblock(fd)) < 0)
     {
       close(fd);
-      return err;
+      return errcode;
     }
 
   memset(&ifr, 0, sizeof(ifr));
@@ -124,10 +125,10 @@ static int tun_alloc(char *dev)
       strncpy(ifr.ifr_name, dev, IFNAMSIZ);
     }
 
-  if ((err = ioctl(fd, TUNSETIFF, (unsigned long)&ifr)) < 0)
+  if ((errcode = ioctl(fd, TUNSETIFF, (unsigned long)&ifr)) < 0)
     {
       close(fd);
-      return err;
+      return errcode;
     }
 
   strcpy(dev, ifr.ifr_name);
@@ -142,17 +143,17 @@ static int tun_alloc(char *dev)
 static int open_tty(char *dev)
 {
   int fd;
-  int err;
+  int errcode;
 
   if ((fd = open(dev, O_RDWR)) < 0)
     {
       return fd;
     }
 
-  if ((err = make_nonblock(fd)) < 0)
+  if ((errcode = make_nonblock(fd)) < 0)
     {
       close(fd);
-      return err;
+      return errcode;
     }
 
   printf("tty fd:%i\n", fd);
diff --git a/nshlib/nsh_console.c b/nshlib/nsh_console.c
index 7544d226a..e47bb2a2f 100644
--- a/nshlib/nsh_console.c
+++ b/nshlib/nsh_console.c
@@ -183,7 +183,7 @@ static ssize_t nsh_consolewrite(FAR struct nsh_vtbl_s *vtbl,
   ret = fwrite(buffer, 1, nbytes, pstate->cn_outstream);
   if (ret < 0)
     {
-      err("ERROR: [%d] Failed to send buffer: %d\n",
+     _err("ERROR: [%d] Failed to send buffer: %d\n",
           pstate->cn_outfd, errno);
     }
   return ret;
diff --git a/nshlib/nsh_telnetd.c b/nshlib/nsh_telnetd.c
index f4e1da0f7..3972c3c80 100644
--- a/nshlib/nsh_telnetd.c
+++ b/nshlib/nsh_telnetd.c
@@ -205,7 +205,7 @@ int nsh_telnetstart(void)
   ret = telnetd_start(&config);
   if (ret < 0)
     {
-      err("ERROR: Failed to tart the Telnet daemon: %d\n", ret);
+     _err("ERROR: Failed to tart the Telnet daemon: %d\n", ret);
     }
 
   return ret;
diff --git a/system/i2c/i2c_main.c b/system/i2c/i2c_main.c
index 286739c3a..5fc238bf5 100644
--- a/system/i2c/i2c_main.c
+++ b/system/i2c/i2c_main.c
@@ -426,7 +426,7 @@ ssize_t i2ctool_write(FAR struct i2ctool_s *i2ctool, FAR const void *buffer, siz
   ret = fwrite(buffer, 1, nbytes, OUTSTREAM(i2ctool));
   if (ret < 0)
     {
-      err("ERROR: [%d] Failed to send buffer: %d\n", OUTFD(i2ctool), errno);
+     _err("ERROR: [%d] Failed to send buffer: %d\n", OUTFD(i2ctool), errno);
     }
 
   return ret;
diff --git a/system/ubloxmodem/ubloxmodem_main.c b/system/ubloxmodem/ubloxmodem_main.c
index 2a8a74dbd..3598e7027 100644
--- a/system/ubloxmodem/ubloxmodem_main.c
+++ b/system/ubloxmodem/ubloxmodem_main.c
@@ -59,7 +59,7 @@
  ****************************************************************************/
 
 #ifdef CONFIG_MODEM_U_BLOX_DEBUG
-#  define m_err    err
+#  define m_err   _err
 #  define m_warn   llwarn
 #  define m_info   info
 #  define m_llerr  llerr