46f6742911
This moves the open call earlier, so that we do any state-changing operations if we actually managed to open the nonblocking fd. The code is easier to follow this way and might be more robust. Suprisingly, this fixes https://github.com/systemd/systemd/issues/39055: it seems that run0 chowns /dev/stdin (in my case /dev/pts/0) to root:root, and the second run0 can read and write stdin/stdout throught the already-open fds, but fd_reopen fails. Fixes https://github.com/systemd/systemd/issues/39055.
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