How to close a file descriptor from another process in unix systems

Question

You can use command lsof to get file descriptors for all running processes, but what I would like to do is to close some of those descriptors without being insi

Answer 1

I doubt it. File descriptors are process-local, stdout is 1 to all processes, yet they still reference unique streams of course.

Perhaps more detail would be useful, about the blocking problem you're trying to solve.