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Some versions of the screen utility provided from the host OS vendor write the socket directory to $HOME/.screen. When using a shared home directory across many servers, one sets the SCREENDIR environment variable to avoid collisions in the shared home directory. This results in problems launching a devshell where it is not entirely obvious what happened because the SCREENDIR environment variable got stripped from the environment prior to setting up the screen in detached mode. Example: % bitbake -c devshell busybox # ...Please connect in another terminal with "screen -r devshell" % screen -r devshell There is no screen to be resumed matching devshell. The temporary work around was to do something like: sh -c "unset SCREENDIR; screen -r devshell" This patch adds SCREENDIR to the white list to ensure screen works properly on systems where a developer needs to use the SCREENDIR with shared home directories. (From OE-Core rev: 5568a8f5a1c65bae021b2e36d735d3153acc6d72) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>