Xin LI c8fb747dc1 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.

MFC after:	2 months
2011-12-28 05:35:33 +00:00
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