SCNetworkCheckReachabilityByName() behaves differently on PPC & Intel Macs
SCNetworkCheckReachabilityByName() behaves differently on PPC & Intel Macs
- Subject: SCNetworkCheckReachabilityByName() behaves differently on PPC & Intel Macs
- From: Alan Staniforth <email@hidden>
- Date: Wed, 9 Sep 2009 20:23:28 +0100
Not a request for help, but this caused some hard to track down
problems so I thought I'd post this and maybe save someone else some
trouble in the future.
When SCNetworkCheckReachabilityByName() is called on PPC and Intel
based Macs, under certain conditions different results are obtained
for the same call.
Steps to Reproduce:
1. Build PPC and Intel versions of the following code:
#import <SystemConfiguration/SystemConfiguration.h>
BOOL result;
SCNetworkConnectionFlags flags;
const char *testHost1 = "homepage.mac.com";
const char *testHost2 = "http://homepage.mac.com/kcall/";;
result = SCNetworkCheckReachabilityByName(testHost1, &flags);
NSLog(@"\t Test 1: 'result' is: %d; 'flags' is: %d\n", result, flags);
result = SCNetworkCheckReachabilityByName(testHost2, &flags);
NSLog(@"\t Test 2: 'result' is: %d; 'flags' is: %d\n", result, flags);
2. Run the code on:
1] PPC Mac
2] Intel Mac
3] PPC Code on an Intel Mac under Rosetta
(ensuring that each test machine has an active internet connection.)
Results:
The PPC machine will output:
Test 1: 'result' is: 1; 'flags' is: 2
Test 2: 'result' is: 1; 'flags' is: 2
The Intel machine and PPC code under Rosetta on the Intel machine will output:
Test 1: 'result' is: 1; 'flags' is: 2
Test 2: 'result' is: 1; 'flags' is: 0
I see it consistently under several version of 10.5.x. Same behaviour
under Snow Leopard (although when built on SL you get deprecation
warnings for SCNetworkCheckReachabilityByName(). I haven't been able
test on 10.4.
The docs for SCNetworkCheckReachabilityByName() specify the
'nodename' parameter as being a hostname not a URL so arguably it's
just sugar that URLs happen to work with PPC library code. However,
on the Intel Macs except sure in the URL case 'result' value should
be NO as it is actually saying it can't determine reachability as you
haven't passed a proper host name.
Filed on Radar/OpenRadar rdar://7182937
Hope this helps somebody, some day
-Alan.
--
Alan Staniforth ** email@hidden
"Meum est propositum/In taberna mori,/Ut sint vina proxima/Morientis ori."
-- Anon.
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