louis@apple.com writes:
File I/O (meaning anything that goes through a file descripter,
including sockets and pipes) is just not a good thing from inside a
driver. From a strictly technical point you can do it, but it is tricky,
expensive, and fragile. In short it is a bad idea. If you are asking
about BSD style signals, they are a process based concept, thread
delivery is difficult in userland when you are multithreaded. In the
kernel they just don't work like that.
So what must I use to communicate between my user land configuration app and the driver? I have been told to use sysctl. Is this my only option? Can Mach IPC be used from user space? Is it recommended? Any other options?
Louis
On Sunday, November 25, 2001, at 10:22 PM, Sean Morrell wrote:
Can named pipes, sockets and signals be used from within a driver,
specifically an I/O Kit kernel audio driver? I have been told that disk
I/O cannot be performed from within a driver? Is this true? If so,
does
this exclude the use of a disk based IPC such as a named pipe?
Thanks,
Sean
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