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controlling tty is the console and already closed. * dtable.h (class dtable): Add members to count descriptors referring to the console. * dtable.cc (dtable::dec_console_fds): New function to detach process from its console. (dtable::release): Decrement the counter of console descriptors. (dtable::build_fhandler): Increment it. * exception.cc (ctrl_c_handler): Send SIGTERM to myself when catch CTRL_SHUTDOWN_EVENT.