How to implement the callback to application functions in a driver
- From: Neverhoodboy <Neverhoodboy@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 7 Jul 2005 01:16:04 -0700
Suppose I have the following data structure:
typedef struct {
void* data_ptr;
void* notify_param;
void (*notify_func)(void* param);
} ExampleStructure;
Here is what the application looks like:
void notification(void* param)
{
/* Does not have to be free(), user can specify the parameter and do
whatever he wants */
free(param);
}
void main()
{
void* data_ptr = malloc(1024);
ExampleStructure example = {data_ptr, data_ptr, notification};
DeviceIoControl(hDevice, &example);
while (1) {}
}
In the driver, I use GetOwnerProcess() and MapPtrToProcess() to map the
example.data_ptr, and then do something with the data pointed by that
pointer. When done, I call the example.notification (the address is also
mapped) to notify the application that I'm done and let application do
whatever it needs, usually a free(). However, what I've experienced is that
if I do something as simple as operating the local variables in the
notification function, it works, however, if I put a call to free() or access
any global variable of the application, it generates data abort exception.
Does anyone know how to solve this? Thanks a bunch!!!
.
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