file descriptor leak in getSrcLines in R 2.10.0 svn 48590

On 5/21/2009 2:17 PM, William Dunlap wrote:

I noticed the following file descriptor leak when I couldn't remove
a package unless I shut down the R session that had loaded and
used it.  The function that triggered the problem printed the output
of a call to parse().  Each time one prints a srcref a connection is
opened and not closed.  It looks like it happens in
as.character.srcref's
call to getSrcLines, which has some logic I don't understand about
closing 'srcfile' on exit only if !.is.Open(srcfile):

I have a simpler recipe to reproduce the crash now:

tf <- tempfile()
con <- file(tf, open="w", encoding="unknown")

This gives an error message about an unsupported conversion
and leaves the con object only partially built. closeAllConnections() 
will then crash.

Should be relatively easy to fix...I'll take a look.