In stdio.h P_tmpdir is defined like this:

/* System V/ANSI C; this is the wrong way to do this, do *not* use these. */
#ifndef _ANSI_SOURCE
#define	P_tmpdir	"/var/tmp/"
#endif

Note the comment.  I suspect this is because we all should use
tmpnam(3), but what if we write/port programs which use a slightly
different policy to tempfile placement?  Shouldn't we use this macro
even then?  If not, what should be used?

Niklas

Niklas Hallqvist	Phone: +46-(0)31-40 75 00
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