Re: AW: dd killed with USR1 right after ftruncate()

[Jim Meyering]

Voelker, Bernhard wrote:
> Pádraig wrote:
>
>> What is your exact dd command please, and destination file system.
>
> I was running KNOPPIX 5.3.1; the source was a harddisk partition, and
> the target was a file in an ext2 filesystem on a harddisk in an USB device
> mounted on /media/sdb2/:
>
>       $ dd if=/dev/sda5 of=/media/sdb2/backups/sda5 bs=1G
>
>> I'm a bit confused as ftruncate is not called unless you specify a
>> non zero seek= but that seems a bit weird from your described usage.
>
> hmm, so maybe it has not actually been the truncate() which took
> so long but the fd_reopen() using O_TRUNC.

Sounds like a good reason to defer SIGUSR1 from post-getopt/arg-verify
until when the copy-timer starts.