Python Popen: are the pipes in blocking mode? how can I put them in non-blocking mode?

Question

Hi,

In the subprocess documentation, I haven't found any hint if the pipes created by PIPE are blocking or non-blocking.

I.e., if I call p.stdout.read(), will it block in certain circumstances? The documentation warns about that. How can I avoid that?

Using p.communicate() is not an option for me because I don't want to block/wait until process has exited.

The only option I see right now is to create another thread and to code some simple non-blocking file-like wrapper object. However, this seems very complicated for such simple task.

Answer 1

A similar question was already asked and various solutions were provided.