getting rid of tempnam / tempname / mktemp ?

[CdeMills]

According to glibc doc, those three functions MAY be victim of race, between
the path name generation and the file opening. The suggestion is to use
mkstemp instead, which create the name, open the file and fails if the file
can't be opened with the O_EXCL flag. 

octave_tempname is used in a few places. Substituing mkstemp introduces the
problem that its return value is an int (low-level file IO), while a stream
is expected. In C, a file descriptor may be transformed into a stream
through fdopen. Can it be used in C++ ? I mean, can the FILE * from fdopen
be transformed into a C++ stream ?

Regards

Pascal 
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