diffc8fb747dc10ec2e99602b237a8fd5172b7c2308b Wed Dec 28 06:35:33 CET 2011 Xin LI <delphij@FreeBSD.org> In POSIX.1-2008:
P_tmpdir [OB XSI] Default directory prefix for tempnam().
This macro is used in a lot of places in legacy applications, and is why we see a lot of programs written for e.g. Linux store volatile temporary files in /var/tmp and not /tmp.