Apple's Sample Code: GetPrimaryMACAddress.c
Apple's Sample Code: GetPrimaryMACAddress.c
- Subject: Apple's Sample Code: GetPrimaryMACAddress.c
- From: Mark de Jong <email@hidden>
- Date: Sat, 26 Oct 2002 10:48:59 -0700
Hi!
I'm using Apple's sample code "GetPrimaryMACAddress.c" to obtain the
machine's MAC address. I'm not doing any networking, just want to get
the MAC address. (And, I don't know anything about IOKit at this point;
I just need to use this code. :-) )
When I call this code, the machine appears "hang on" to something
causing delays in other programs, most notably internet applications.
While digging through the code, I noticed "masterPort" was not being
released when it was done being used. At the bottom of "static
kern_return_t FindEthernetInterfaces(io_iterator_t *matchingServices)",
there is the following code:
kernResult = IOServiceGetMatchingServices(masterPort,
classesToMatch, matchingServices);
if (KERN_SUCCESS != kernResult)
printf("IOServiceGetMatchingServices returned %d\n",
kernResult);
return kernResult;
where "masterPort" had been previously created with:
kernResult = IOMasterPort(MACH_PORT_NULL, &masterPort);
if (KERN_SUCCESS != kernResult)
printf("IOMasterPort returned %d\n", kernResult);
So, I changed the end of the routine to look like this:
kernResult = IOServiceGetMatchingServices(masterPort,
classesToMatch, matchingServices);
if (KERN_SUCCESS != kernResult)
printf("IOServiceGetMatchingServices returned %d\n",
kernResult);
IOObjectRelease( masterPort );
return kernResult;
Adding the "IOObjectRelease()" call to release the masterPort.
Here's my question: Could not releasing the "masterPort" cause the
delays I had been seeing? And, is this an ok way to fix it?
Thanks,
-- Mark
_______________________________________________
cocoa-dev mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/cocoa-dev
Do not post admin requests to the list. They will be ignored.