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qemu-nbd: properly report error on error in dup2() after qemu_daemon()
We are trying to temporarily redirect stderr of daemonized process to a pipe to report a error and get failed. In that case we could not use error_report() helper, but should write the message directly into the problematic pipe. Signed-off-by: Denis V. Lunev <den@openvz.org> CC: Eric Blake <eblake@redhat.com> CC: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> Message-ID: <20230717145544.194786-4-den@openvz.org> Reviewed-by: Eric Blake <eblake@redhat.com> [eblake: rearrange patch series, fix typo] Signed-off-by: Eric Blake <eblake@redhat.com>
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