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The TR 24731-1 {{tmpnam_s()}} function generates a string that is a valid filename and that is not the same as the name of an existing file \[[ISO/IEC TR 24731-1-2007|AA. C References#SO/IEC TR 24731-1-2007]\]. The function is potentially capable of generating {{TMP_MAX_S}} different strings, but any or all of them may already be in use by existing files and thus not be suitable return values. The lengths of these strings must be less than the value of the {{L_tmpnam_s}} macro. |
The L_tmpnam_s macro expands to an integer constant expression that is the size needed for an array of char large enough to hold a temporary filename string generated by the tmpnam_s() function. The TMP_MAX_S macro expands to an integer constant expression that is the maximum number of unique filenames that can be generated by the tmpnam_s() function. The value of the macro TMP_MAX_S is only required to be 25 by ISO/IEC TR 24731-1.
Non-normative text in TR 24731-1 also recommends the following:
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