Moin! When I execute Ruby like in the following sample and press Ctrl-C I get the following output most of the time: ruby -e "loop {IO.select [IO.popen(%{ruby -e'loop{puts}'})]}" -e:1: Interrupt from -e:1:in `loop' from -e:1 -e:1: Interrupt from -e:1:in `loop' from -e:1 -e:1: Interrupt from -e:1:in `loop' from -e:1 -e:1: [BUG] rb_sys_fail() - errno == 0 ruby 1.8.2 (2004-07-16) [i386-mswin32] This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. -e:1: [BUG] rb_sys_fail() - errno == 0 ruby 1.8.2 (2004-07-16) [i386-mswin32] [Above repeated four more times.] This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. Regards, Florian Gross