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Hello DM,
On Nov 17, 2004, at 2:04 AM, email@hidden wrote:
--
Hi,
I am trying to further implement the following Apple Kernel sample.
How do I parse / filter / the IOService which is handed to me?
I have tried several options, but am getting nowhere.
I need to know the name of the class (open, create, etc) and the
specific params for each call
client->serviceMatching( "open", table );
A filter scheme is located well below the filesystem, so it has no
knowledge of UNIX syscalls or files. A filter scheme only knows
about reading/writing a buffer at a particular location on an
IOMedia object. An IOMedia object is typically either a partition or
the entire medium.
The IOService handed to you is the IOMedia object published by the
filter scheme.
Why do you want to intercept file I/O calls?
--gc
P.S. Please do not cross-post to multiple lists. If you do, people
on one list don't know anything about the responses on the other
list. I'm replying to the darwin-dev list only.
Note: this is a kext with KERNEL = 1, so not all api's are accessible.
Thanks, DM
======= Apple Code =======
void com_apple_dts_driver_SampleFilterScheme::read(IOService* client ,
UInt64 byteStart,
IOMemoryDescriptor* buffer,
IOStorageCompletion completion)
{
// Read data from the storage object at the specified byte
offset into the
// specified buffer, asynchronously. When the read completes,
the caller
// will be notified via the specified completion action.
//
// The buffer will be retained for the duration of the read.
//
// For simple partition schemes, the default behavior is to
simply pass the
// read through to the provider media. More complex partition
schemes such
// as RAID will need to do extra processing here.
//
getProvider()->read(this, byteStart, buffer, completion);
}
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__________________________________________________________________
Garth Cummings
Apple Developer Technical Support email@hidden
http://developer.apple.com/technicalsupport
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