C or C++ : Predictable mkstemp filename

Using mkstemp with a string containing less than six “X” characters as a parameter is insecure. This function creates a temporary file with a unique name. The number of “X” characters in the string argument specifies specifies the number of random characters in the file name. If the argument contains less than six “X” characters, the call is insecure. The same applies to mkstemps, mkdtemp.