kextload: extension ./MyKext.kext appears to be valid
kld(): Undefined symbols:
_log
_logpri
Changing the dependency to a more generic "com.apple.kernel" version
8.8.1 solves the kextload problem.
Looks like log() and logpri() of syslog.h are unsupported ? b'coz i
could trace the dependency of log() to "com.apple.kpi.unsupported"
logpri() is there only in the header.
thanks,
Thulli.
On 26-Oct-06, at 7:57 PM, Justin C. Walker wrote:
On Oct 26, 2006, at 24:42 , Thulli wrote:
Can somebody advise on the best method for logging from a kext.
Considered the following.
1. printf and IOLog. I couldn't catch the logs just before my kext
caused panic :)
These are two choices; the other is syslog(). They all are pretty
much the same (i.e., they are wrappers around the same code),
although IOLog is designed for IOKit components.
2. Custom event logging: This method is very heavy. I don't want
to write a user land tool, just for logging purpose.
Not really a solution, for the same reasons the above aren't perfect.
3. asl looks very good. Is this available for a kext ?
Well, the header file is in /usr/include, which is a great
indicator for kernel use: can't (or shouldn't) be used in the kernel.
Your basic problem is that, if a panic occurs, the system grinds to
a halt and therefore, any scheme that makes use of system
mechanisms will halt along with it.
There is not a very good way to deal with this in the field, due to
the above.
Andrew's suggestion is about the best that I'm aware of. The
ability to send a kernel dump to a (local) dump server might be of
some help, depending on how your customers are set up.
Justin
--
Justin C. Walker, Curmudgeon at Large
Institute for the Absorption of Federal Funds
-----------
I'm beginning to like the cut of his jibberish.
-----------
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