first implementation supporting Process Substitution

programs/util.h

@@ -191,6 +191,7 @@ int UTIL_isSameFileStat(const char* file1, const char* file2, const stat_t* file
 int UTIL_isCompressedFile(const char* infilename, const char *extensionList[]);
 int UTIL_isLink(const char* infilename);
 int UTIL_isFIFO(const char* infilename);
+int UTIL_isFileDescriptorPipe(const char* filename);
 
 /**
  * Returns with the given file descriptor is a console.