BSD 2.11 - man page for mkstemp (bsd section 3)
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mktemp - make a unique file name
Mktemp creates a unique file name and returns the address of the template. The template
should contain a file name with trailing X's, normally something like /tmp/tempXXXXXX.
The X's are replaced by the current process number and/or a unique letter combination.
Mkstemp makes the same replacement to the template but opens the template file and returns
a file descriptor open for reading and writing. Mkstemp avoids the race between testing
whether the file exists and opening it for use. The number of file name combinations
mktemp and mkstemp will try depends on the number of X's placed on the end of the tem-
plate; six X's will result in them trying roughly 26 ** 6 combinations.
access(2), getpid(2), open(2)
Mktemp returns NULL on failure, mkstemp returns -1 if no suitable file could be created.
7th Edition April 10, 1987 MKTEMP(3)
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