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     The tmpfile function creates a temporary file and returns a
     pointer to that stream. If the file cannot be opened, tmpfile
     returns a NULL pointer.
 
     This temporary file is automatically deleted when the file is
     closed, when the program terminates normally, or when rmtmp is
     called, assuming that the current working directory does not
     change. The temporary file is opened in w+b (binary read/write)
     mode.
 
     Return Value
 
     If successful, the tmpfile function returns a stream pointer.
     Otherwise, it returns a NULL pointer.
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