The only solution I've seen is to start up gdb with the process and point the process's 0, 1 & 2 file descriptors to the shell's STDIN, STDOUT and STDERR, then

The only solution I've seen is to start up gdb with the process and point the process's 0, 1 & 2 file descriptors to the shell's STDIN, STDOUT and STDERR, then detach the process and quit gdb. I can't remember the exact details, but that should be enough to set you up for some googling.