[Rd] tempdir() documentation or real bug ?

[Brian G. Peterson]

?tempdir says

By default, ‘tmpdir’ will be the directory given by ‘tempdir()’.
     This will be a subdirectory of the temporary directory found by
     the following rule.  The environment variables ‘TMPDIR’, ‘TMP’ and
     ‘TEMP’ are checked in turn and the first found which points to a
     writable directory is used: if none succeeds ‘/tmp’ is used.


Unfortunately, it doesn't seem to work as advertised.

> Sys.setenv(TMPDIR='/home/brian/')
> Sys.getenv('TMPDIR')
[1] "/home/brian/"
> tempdir()
[1] "/tmp/RtmpfERGay"


> Sys.setenv(TEMP='/home/brian/')
> Sys.getenv('TEMP')
[1] "/home/brian/"
> tempdir()
[1] "/tmp/RtmpfERGay"


> Sys.setenv(TMP='/home/brian/')
> Sys.getenv('TMP')
[1] "/home/brian/"
> tempdir()
[1] "/tmp/RtmpfERGay"


Our /tmp/ directory is not very large, so I'd like to create tempdir()'s
in someplace that has space.

Regards,

   - Brian

-- 
Brian G. Peterson
http://braverock.com/brian/
Ph: 773-459-4973
IM: bgpbraverock