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Declaration:
char *tmpnam(char *str);
Generates and returns a valid temporary filename which does not
exist. Up to TMP_MAX different filenames can
be generated.If the argument str is a null pointer, then the
function returns a pointer to a valid filename. If the argument
str is a valid pointer to an array, then the filename is
written to the array and a pointer to the same array is
returned. The filename may be up to L_tmpnam
characters long.
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