The mktemp() function replaces the contents of the string pointed to by template with a unique file name, and returns template. The string in template should look like a file name with six trailing 'X's; mktemp() will replace the 'X's with a character string that can be used to create a unique file name. Only 26 unique file names per thread can be created for each unique template.

The mktemp() function will assign to template the empty string if it cannot create a unique name.

See attributes(5) for descriptions of the following attributes:

mkstemp(3C), tmpfile(3C), tmpnam(3C), attributes(5)