ultrix man page for mktemp

mktemp(3)						     Library Functions Manual							 mktemp(3)

Name
       mktemp - make a unique file name

Syntax
       char *mktemp(template)
       char *template;

Description
       The subroutine replaces template by a unique file name, and returns the address of the template.  The template should look like a file name
       with six trailing X's, which will be replaced with the current process ID and a unique letter.

       Note: The use of is not recommended for new applications.  See for less error-prone alternatives.

See Also
       getpid(2), tmpfile(3), tmpnam(3)

																	 mktemp(3)