device-emulation

I already read Creating a Virtual USB Device and Virtual USB device about creating a virtual USB Device. I am familiar with the Plug and Play handling by Windows as well as the driver mechanism. So far I understood that first of all I would have to create another device driver which is used for the virtual USB device. But I am still lost on the point what actually is the virtual device. How would I control the behaviour of my virtual device? Background: I develop a software which acts as a communication layer between an API and the USB driver. The behaviour of the USB device is well known to

I'm looking for an easier way to test my application against faulty block devices that generate i/o read errors when certain blocks are read. Trying to use a physical hard drive with known bad blocks is a pain and I would like to find a software solution if one exists. I did find the Linux Disk Failure Simulation Driver which allows creating an interface that can be configured to generate errors when certain ranges of blocks are read, but it is for the 2.4 Linux Kernel and hasn't been updated for 2.6. What would be perfect would be an losetup and loop driver that also allowed you to configure

I would like to catch memory writes to specific memory ranges and call a function with the address of the memory location being written to. Preferably, after the write to memory has already happened. I know this can be done by the operating system by twiddling with the page table entries. However, how can this be similar accomplished from within an application that wants to do this? Well, you could do something like this: // compile with Open Watcom 1.9: wcl386 wrtrap.c #include <windows.h> #include <stdio.h> #ifndef PAGE_SIZE #define PAGE_SIZE 4096 #endif UINT_PTR RangeStart = 0; SIZE_T