[R-SIG-Mac] 2.14.0 alpha hangs after fg after ctrl-Z

[Vincent Carey]

i am running R version 2.14.0 alpha (2011-10-03 r57154) in an X11
terminal.  i build from source.
i often use ctrl-Z to pause the session and return to it via fg.  i
find that R hangs upon fg -- it does not
respond to ctrl-C and ctrl-\ takes some time to give a shell back.
Problem is not present in my
linux build of r57208.

> sessionInfo()
R version 2.14.0 alpha (2011-10-03 r57154)
Platform: x86_64-apple-darwin10.8.0/x86_64 (64-bit)

locale:
[1] en_US.US-ASCII/en_US.US-ASCII/en_US.US-ASCII/C/en_US.US-ASCII/en_US.US-ASCII

attached base packages:
[1] stats     graphics  grDevices datasets  utils     tools     methods
[8] base

other attached packages:
[1] BiocInstaller_1.1.28 weaver_1.19.2        codetools_0.2-8
[4] digest_0.5.1