[syslinux] Read disk with open()/read()?
Gordon Schumacher
gordon at rebit.com
Sat Dec 15 12:14:52 PST 2007
On Fri, 14 Dec 2007 17:14:26 -0800, H. Peter Anvin wrote:
> Using the COM32 library, no. You could create a device descriptor for
> it and use opendev() (I don't use filename tricks, because it prevents
> the linker from doing its job.)
>
After a bunch more digging, I'd concluded the much the same thing. I'm
puzzled what you mean about the linker though - do you mean ld? If so
what does it have to do with what we're passing to com32's open function?
> chain.c has code to read raw disks, obviously, but it doesn't use the
> device layer. I'm not 100% sure if using the device layer is desirable,
> since it's rather limited and doesn't (currently) support seeks, but
> I'd be interested in hearing people's opinion on it.
>
Well... so I have an lseek() function that works for com32 as well now,
even for seeking backwards. (To be fair I haven't tested it strenuously
yet.) I've also got some changes that allow one to use
open/read/lseek/etc. on the raw disk.
At this point, really, I have a bunch of patches to submit to y'all and
see what you think; I'm just working on getting the place to store them
set up first. Should be within the next week or so... I've been busy
busy, hehe...
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