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c4ab58cd2e
These fds are stdin, stdout and stderr respectively, and are expected to remain open at all times (if they are not needed then they can point to /dev/null, but they should always be open). If the user gives us `--env-fd=2` or similar, we don't want to close fd 2 before exiting unsuccessfully: that would give us nowhere to display the error message. Signed-off-by: Simon McVittie <smcv@collabora.com>