mkstemp() implementation for win32

Question

Can anybody point me to the code that implements mkstemp() (C/C++) on Win32, or very close analog.

Must be race-free.

It\'s supposed to look like

Answer 1

Actually, using _mktemp_s() is a really bad idea -- only 26 possible file name candidates in any one context, and, with this limited range to be attacked, it exposes the very race condition that mkstemp() is designed to overcome. However, the other proposed solution, while much better, is also flawed, insofar as it attributes 62 degrees of freedom in the choice of substitute file name characters, whereas the case insensitivity of the Windows file system consumes 26 of these, thus leaving only 36; this has the effect of weighting the probability of selecting any logically distinguishable alphabetic character at double that for a numeric.

With this in mind, I've posted a MinGW patch here: https://sourceforge.net/p/mingw/bugs/2003/

If adopted, this will formally add both mkstemp() and mkdtemp() to the standard MinGW distribution.