diff --git a/reactos/include/msvcrt/msvcrtdbg.h b/reactos/include/msvcrt/msvcrtdbg.h
new file mode 100644
index 00000000000..3916f9ad63d
--- /dev/null
+++ b/reactos/include/msvcrt/msvcrtdbg.h
@@ -0,0 +1,43 @@
+/*
+ * COPYRIGHT:       See COPYING in the top level directory
+ * PROJECT:         ReactOS kernel
+ * FILE:            include/msvcrt/msvcrtdbg.h
+ * PURPOSE:         Useful debugging macros
+ * PROGRAMMER:      
+ * UPDATE HISTORY: 
+ *                
+ */
+
+/*
+ * NOTE: Define NDEBUG before including this header to disable debugging
+ * macros
+ */
+
+#ifndef __MSVCRT_DEBUG
+#define __MSVCRT_DEBUG
+
+#include <roscfg.h>
+
+#if 0
+#ifdef NDEBUG
+#undef NDEBUG
+#endif
+#endif
+
+#ifdef DBG
+#define DPRINT1(args...) do { DbgPrint("(MSVCRT:%s:%d) ",__FILE__,__LINE__); DbgPrint(args); } while(0);
+#define CHECKPOINT1 do { DbgPrint("MSVCRT:%s:%d\n",__FILE__,__LINE__); } while(0);
+#else
+#define DPRINT1(args...)
+#define CHECKPOINT1
+#endif
+
+#if !defined(NDEBUG) && defined(DBG) 
+#define DPRINT(args...) do { DbgPrint("(MSVCRT:%s:%d) ",__FILE__,__LINE__); DbgPrint(args); } while(0);
+#define CHECKPOINT do { DbgPrint("MSVCRT:%s:%d\n",__FILE__,__LINE__); } while(0);
+#else
+#define DPRINT(args...)
+#define CHECKPOINT
+#endif /* NDEBUG */
+
+#endif /* __MSVCRT_DEBUG */
diff --git a/reactos/lib/msvcrt/io/access.c b/reactos/lib/msvcrt/io/access.c
index 36f0e18fcbe..493c4a748eb 100644
--- a/reactos/lib/msvcrt/io/access.c
+++ b/reactos/lib/msvcrt/io/access.c
@@ -1,5 +1,8 @@
 #include <windows.h>
 #include <msvcrt/io.h>
+#include <msvcrt/errno.h>
+#define NDEBUG
+#include <msvcrt/msvcrtdbg.h>
 
 #ifndef F_OK
  #define F_OK	0x01
@@ -20,17 +23,24 @@
 int _access( const char *_path, int _amode )
 {
 	DWORD Attributes = GetFileAttributesA(_path);
+	DPRINT("_access('%s', %x)\n", _path, _amode);
 
-	if ( Attributes == -1 )
+	if ( Attributes == -1 )	{
+	        __set_errno(ENOENT);
 		return -1;
+	}
 
 	if ( (_amode & W_OK) == W_OK ) {
-		if ( (Attributes & FILE_ATTRIBUTE_READONLY) == FILE_ATTRIBUTE_READONLY )
+		if ( (Attributes & FILE_ATTRIBUTE_READONLY) == FILE_ATTRIBUTE_READONLY ) {
+			__set_errno(EACCES);
 			return -1;
+		}
 	}
 	if ( (_amode & D_OK) == D_OK ) {
-		if ( (Attributes & FILE_ATTRIBUTE_DIRECTORY) != FILE_ATTRIBUTE_DIRECTORY )
+		if ( (Attributes & FILE_ATTRIBUTE_DIRECTORY) != FILE_ATTRIBUTE_DIRECTORY ) {
+			__set_errno(EACCES);
 			return -1;
+		}
 	}
 
 	return 0;
@@ -40,16 +50,22 @@ int _waccess( const wchar_t *_path, int _amode )
 {
 	DWORD Attributes = GetFileAttributesW(_path);
 
-	if ( Attributes == -1 )
+	if ( Attributes == -1 ) {
+	        __set_errno(ENOENT);
 		return -1;
+	}
 
 	if ( (_amode & W_OK) == W_OK ) {
-		if ( (Attributes & FILE_ATTRIBUTE_READONLY) == FILE_ATTRIBUTE_READONLY )
+		if ( (Attributes & FILE_ATTRIBUTE_READONLY) == FILE_ATTRIBUTE_READONLY ) {
+			__set_errno(EACCES);
 			return -1;
+		}
 	}
 	if ( (_amode & D_OK) == D_OK ) {
-		if ( (Attributes & FILE_ATTRIBUTE_DIRECTORY) != FILE_ATTRIBUTE_DIRECTORY )
+		if ( (Attributes & FILE_ATTRIBUTE_DIRECTORY) != FILE_ATTRIBUTE_DIRECTORY ) {
+			__set_errno(EACCES);
 			return -1;
+		}
 	}
 
 	return 0;
diff --git a/reactos/lib/msvcrt/io/chmod.c b/reactos/lib/msvcrt/io/chmod.c
index 8932834d496..f5d61aa97f0 100644
--- a/reactos/lib/msvcrt/io/chmod.c
+++ b/reactos/lib/msvcrt/io/chmod.c
@@ -1,12 +1,15 @@
 #include <windows.h>
 #include <msvcrt/io.h>
 
-#define mode_t int
+#define NDEBUG
+#include <msvcrt/msvcrtdbg.h>
 
+#define mode_t int
 
 int _chmod(const char *filename, mode_t mode)
 {
   DWORD FileAttributes = 0;
+  DPRINT("_chmod('%s', %x)\n", filename, mode);
 
   FileAttributes = GetFileAttributesA(filename);
   if ( FileAttributes == -1 )
@@ -31,6 +34,7 @@ int _chmod(const char *filename, mode_t mode)
 int _wchmod(const wchar_t *filename, mode_t mode)
 {
   DWORD FileAttributes = 0;
+  DPRINT("_wchmod('%S', %x)\n", filename, mode);
 
   FileAttributes = GetFileAttributesW(filename);
   if ( FileAttributes == -1 )
diff --git a/reactos/lib/msvcrt/io/chsize.c b/reactos/lib/msvcrt/io/chsize.c
index a0ca25ef237..865bec2e461 100644
--- a/reactos/lib/msvcrt/io/chsize.c
+++ b/reactos/lib/msvcrt/io/chsize.c
@@ -1,8 +1,12 @@
 /* Copyright (C) 1996 DJ Delorie, see COPYING.DJ for details */
 #include <msvcrt/io.h>
 
+#define NDEBUG
+#include <msvcrt/msvcrtdbg.h>
+
 int _chsize(int _fd, long size)
 {
+  DPRINT("_chsize(fd %d, size %d)\n", _fd, size);
   if (lseek(_fd, size, 0) == -1)
     return -1;
   if (_write(_fd, 0, 0) < 0)
diff --git a/reactos/lib/msvcrt/io/close.c b/reactos/lib/msvcrt/io/close.c
index db9bd4e9240..65d6230ce39 100644
--- a/reactos/lib/msvcrt/io/close.c
+++ b/reactos/lib/msvcrt/io/close.c
@@ -2,8 +2,12 @@
 #include <msvcrt/io.h>
 #include <msvcrt/internal/file.h>
 
+#define NDEBUG
+#include <msvcrt/msvcrtdbg.h>
+
 int _close(int _fd)
 {
+  DPRINT("_close(fd %d)\n", _fd);
   if (_fd == -1)
     return -1;
   if (CloseHandle(_get_osfhandle(_fd)) == FALSE)
diff --git a/reactos/lib/msvcrt/io/create.c b/reactos/lib/msvcrt/io/create.c
index f8ee1a0fb4c..3f11706db79 100644
--- a/reactos/lib/msvcrt/io/create.c
+++ b/reactos/lib/msvcrt/io/create.c
@@ -1,12 +1,17 @@
 #include <msvcrt/io.h>
 #include <msvcrt/fcntl.h>
 
+#define NDEBUG
+#include <msvcrt/msvcrtdbg.h>
+
 int _creat(const char *filename, int mode)
 {
+  DPRINT("_creat('%s', mode %x)\n", filename, mode);
   return _open(filename,_O_CREAT|_O_TRUNC,mode);
 }
 
 int _wcreat(const wchar_t *filename, int mode)
 {
+  DPRINT("_wcreat('%S', mode %x)\n", filename, mode);
   return _wopen(filename,_O_CREAT|_O_TRUNC,mode);
 }
diff --git a/reactos/lib/msvcrt/io/isatty.c b/reactos/lib/msvcrt/io/isatty.c
index 0291bfbdee2..3ed7a80d1e6 100644
--- a/reactos/lib/msvcrt/io/isatty.c
+++ b/reactos/lib/msvcrt/io/isatty.c
@@ -1,11 +1,13 @@
 #include <msvcrt/io.h>
 #include <msvcrt/sys/stat.h>
 
+#define NDEBUG
+#include <msvcrt/msvcrtdbg.h>
 
 int _isatty( int fd )
 {
   struct stat buf;
-
+  DPRINT("_isatty(fd %d)\n", fd);
   if (_fstat (fd, &buf) < 0)
     return 0;
   if (S_ISCHR (buf.st_mode))
diff --git a/reactos/lib/msvcrt/io/mktemp.c b/reactos/lib/msvcrt/io/mktemp.c
index 4f531706de8..6f31b4a0007 100644
--- a/reactos/lib/msvcrt/io/mktemp.c
+++ b/reactos/lib/msvcrt/io/mktemp.c
@@ -17,6 +17,9 @@
 #include <msvcrt/string.h>
 #include <msvcrt/io.h>
 
+#define NDEBUG
+#include <msvcrt/msvcrtdbg.h>
+
 
 char* _mktemp (char *_template)
 {
@@ -24,6 +27,7 @@ char* _mktemp (char *_template)
   char *cp, *dp;
   int i, len, xcount, loopcnt;
 
+  DPRINT("_mktemp('%s')\n", _template);
   len = strlen (_template);
   cp = _template + len;
 
@@ -76,6 +80,7 @@ wchar_t* _wmktemp (wchar_t *_template)
   wchar_t *cp, *dp;
   int i, len, xcount, loopcnt;
 
+  DPRINT("_wmktemp('%S')\n", _template);
   len = wcslen (_template);
   cp = _template + len;
 
diff --git a/reactos/lib/msvcrt/io/unlink.c b/reactos/lib/msvcrt/io/unlink.c
index 542e766ee32..9165aac0440 100644
--- a/reactos/lib/msvcrt/io/unlink.c
+++ b/reactos/lib/msvcrt/io/unlink.c
@@ -10,16 +10,23 @@
 #include <windows.h>
 #include <msvcrt/io.h>
 
+#define NDEBUG
+#include <msvcrt/msvcrtdbg.h>
+
 
 int _unlink(const char *filename)
 {
+  int result = 0;
+  DPRINT("_unlink('%s')\n", filename);
   if (!DeleteFileA(filename))
-    return -1;
-  return 0;
+    result = -1;
+  DPRINT("%d\n", result);
+  return result;
 }
 
 int _wunlink(const wchar_t *filename)
 {
+  DPRINT("_wunlink('%S')\n", filename);
   if (!DeleteFileW(filename))
     return -1;
   return 0;
diff --git a/reactos/lib/msvcrt/stdio/remove.c b/reactos/lib/msvcrt/stdio/remove.c
index 52b04f8e142..5f309af75f5 100644
--- a/reactos/lib/msvcrt/stdio/remove.c
+++ b/reactos/lib/msvcrt/stdio/remove.c
@@ -2,15 +2,22 @@
 #include <msvcrt/stddef.h>
 #include <msvcrt/stdio.h>
 
+#define NDEBUG
+#include <msvcrt/msvcrtdbg.h>
+
 int remove(const char *fn)
 {
+  int result = 0;
+  DPRINT("remove('%s')\n", fn);
   if (!DeleteFileA(fn))
-    return -1;
-  return 0;
+    result = -1;
+  DPRINT("%d\n", result);
+  return result;
 }
 
 int _wremove(const wchar_t *fn)
 {
+  DPRINT("_wremove('%S')\n", fn);
   if (!DeleteFileW(fn))
     return -1;
   return 0;
diff --git a/reactos/lib/msvcrt/stdlib/senv.c b/reactos/lib/msvcrt/stdlib/senv.c
index 6311b8183b8..32c1afea984 100644
--- a/reactos/lib/msvcrt/stdlib/senv.c
+++ b/reactos/lib/msvcrt/stdlib/senv.c
@@ -2,6 +2,9 @@
 #include <msvcrt/stdlib.h>
 #include <msvcrt/string.h>
 
+#define NDEBUG
+#include <msvcrt/msvcrtdbg.h>
+
 void _searchenv(const char *file,const char *var,char *path )
 {
 	char *env = getenv(var);
@@ -9,6 +12,7 @@ void _searchenv(const char *file,const char *var,char *path )
 	char *y;
 	char *FilePart;
 
+	DPRINT("_searchenv()\n");
 	x = strchr(env,'=');
 	if ( x != NULL ) {
 		*x = 0;
@@ -33,6 +37,7 @@ void _wsearchenv(const wchar_t *file,const wchar_t *var,wchar_t *path)
 	wchar_t *y;
 	wchar_t *FilePart;
 
+	DPRINT("_searchenw()\n");
 	x = wcschr(env,L'=');
 	if ( x != NULL ) {
 		*x = 0;