Minor changes to make the creation of files and directories cleaner

src/obidms.c

@@ -128,7 +128,10 @@ OBIDMS_p obi_create_dms(const char* dms_name)
 	if (mkdir(directory_name, 00777) < 0)
 	{
 		if (errno == EEXIST)
+		{
 			obi_set_errno(OBIDMS_EXIST_ERROR);
+			obidebug(1, "\nAn OBIDMS directory with the same name already exists in this directory.");
+		}
 		else
 			obi_set_errno(OBIDMS_UNKNOWN_ERROR);
 		obidebug(1, "\nProblem creating an OBIDMS directory");

src/obidmscolumn.c

@@ -338,7 +338,7 @@ static obiversion_t create_version_file(OBIDMS_column_directory_p column_directo
 		return -1;
 
 	// Get the file descriptor associated to the version file
-	version_file_descriptor = openat(column_directory->dir_fd, version_file_name, O_RDWR | O_CREAT, 0777);
+	version_file_descriptor = openat(column_directory->dir_fd, version_file_name, O_RDWR | O_CREAT | O_EXCL, 0777);
 	if (version_file_descriptor < 0)
 	{
 		obi_set_errno(OBICOL_UNKNOWN_ERROR);
@@ -660,7 +660,7 @@ OBIDMS_column_p obi_create_column(OBIDMS_p dms,
 	}
 
 	// Open the column file
-	column_file_descriptor = openat(column_directory->dir_fd, column_file_name, O_RDWR | O_CREAT, 0777);
+	column_file_descriptor = openat(column_directory->dir_fd, column_file_name, O_RDWR | O_CREAT | O_EXCL, 0777);
 	if (column_file_descriptor < 0)
 	{
 		obi_set_errno(OBICOL_UNKNOWN_ERROR);