C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
tmpfile
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <stdio.h>
 
  Syntax:    FILE *tmpfile( void );
 
  Returns:   a stream pointer if successful, or NULL if not.
 
  See also:  _rmtmp, _tempnam
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