[issue8052] subprocess close_fds behavior should only close open fds

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

> Can we use FD_CLOEXEC to archive this goal? 

I think we should use FD_CLOEXEC in all places where it's reasonable.
As others have pointed out, we shouldn't set FD_CLOEXEC for file
descriptors where the application hasn't explicitly requested that.

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