[Qt-interest] Block Device File I/O

[Alex]

Thanks!
It definitly help me.

2010/6/1 Srdjan Todorovic <todorovic.s at googlemail.com>

> On 1 June 2010 04:22, Alex <shao.tu at gmail.com> wrote:
>
> > Yes, the /dev/nstXX is the standard mount point for a tape drive under
> > Linux.
>
> No. /dev/nstXX is a device node for a tape drive, not a mount point.
>
> > I agree with you that I may implement my own class inherits QIODevice to
> > achieve.
> > But, my problem is that I have no idea how to implement the real I/O
> action
> > under QT framework.
> > Especially for a block device file.
>
> I would think that it would act like a SCSI device or a tape device.
> Something like a data path and an out-of-band path. Data path would be
> related to read() and write() syscalls, and out of band path would
> perhaps be ioctl() calls to set tape parameters and actual hardware
> control.
>
> You could study parts of Linux Device Drivers (3rd edition) to get
> more insight on how this works, or also study the source code of mt
> and mtx, which are both tape device control programs.
>
> Hope that helps,
> Srdjan
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