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Re: clock_delay_for_interval

On Tuesday, June 17, 2003, at 11:55 AM, Eric Long wrote:
The kext links against the kernel framework, yet when I try to load the kext
I get this message:

kld(): Undefined symbols:
_clock_delay_for_interval

I'm running on 10.2.6. The kext loaded fine before I added this call.
Anyone know why this symbol is missing?

For some reason, the actual implementation of this routine (on PowerPC - it doesn't exist on Darwin/x86) is called "delay_for_interval()" (without the "clock" prefix). I'm not sure whether this was intentional for some reason, or just an error. But I think that exposing this routine in the header at all was a mistake. There are other, more supported ways, of doing this that a preferable.

What kind of KEXT is this? If it's an IOKit KEXT, you should be using IODelay(). If it is a non-IOKit KEXT, you are probably already knee-deep in "no-compatibility-guarantees" code. But the routine delay() is much more likely to be supported long term than the implementation routine you found and tried.

--Jim

PS: Kernel documentation is coming. But only for KEXTs that fit into nice, neat, categories (IOKit, Filesystem, Network, etc..). Anything outside of these categories will, to some extent, still be playing with fire.
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 >clock_delay_for_interval (From: Eric Long <email@hidden>)



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