How about a FIFO? Use mkfifo to create a named pipe inside your
ephemeral filesystem, then launch your two child processes. One can
write to it, the other can read. So using your bash example:
$ heroku run bash
~ $ mkfifo myfifo
~ $ cat myfifo | ./run_listener_process
~ $ ./run_other_process_that_sends_data > myfifo
Adam
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