3715154a8e
When multiple child processes are running, closing the stdin of one child did not send EOF or cause POLLNVAL, as long as a dup()'ed filedes still existed. This fixes an issue when running an mp3 encoder while the video monitor is visible, and will allow to concurrently run multiple mp3 encoders or other child processes. Previously this caused Ardour to hang indefinitely in CmdPipeWriter ``` _proc->close_stdin(); _proc->wait(); // << here ```
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