Messages in this thread | | | Date | Mon, 18 Jan 2010 11:00:19 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: [PATCH 6/6] vfs: introduce FMODE_NEG_OFFSET for allowing negative f_pos |
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On Mon, 18 Jan 2010 10:38:27 +0900 OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> wrote:
> KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> writes: > > >> So, lseek() returns (uses) it? > > > > lseek can return negative value, as far as I know. > > Umm..., how do you know the difference of -EOVERFLOW and fpos == -75? >
Ah, sorry. I read wrong.
For /dev/mem, it uses its own lseek function which allows negative f_pos value. Other usual file system doesn't allow negative f_pos.
It's ok not to return -EOVEFLOW for /dev/mem because there is no file end.
Thanks, -Kame
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