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Problem with distributed objects.
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Problem with distributed objects.


  • Subject: Problem with distributed objects.
  • From: Tobias Sargeant <email@hidden>
  • Date: Wed, 9 Feb 2005 12:42:50 +1100

For some reason, trying to log a proxy causes a core dump. Emulating what I believe should be going on behind the scenes doesn't cause the same problem, and I'm at a loss to work out why. I realise that it's a case of 'Doctor, it hurts when I do this...', but I'm curious to know why...

If anyone can enlighten me, I'd be very happy.

Thanks,
Toby.

The code snippet:

id addr = [addrs objectAtIndex: 0];
struct sockaddr *sa = (struct sockaddr *)[addr bytes];
NSSocketPort *net_port = [[NSSocketPort alloc] initRemoteWithProtocolFamily: sa->sa_family
socketType: SOCK_STREAM
protocol: IPPROTO_TCP
address: addr];
NSConnection *net_conn = [[NSConnection connectionWithReceivePort: nil sendPort: net_port] retain];
id root = [[net_conn rootProxy] retain];
[root setProtocolForProxy: @protocol(IQServer)];
NSLog(@"root = %p", root);
NSLog(@"[root foo] = %@", [root foo]);
NSLog(@"[root respondsToSelector:@selector(descriptionWithLocale:)] = %d", [root respondsToSelector:@selector(descriptionWithLocale:)]);
NSLog(@"[root description] = %@", [root description]);
NSLog(@"root = %@", root);
[root release];
[net_conn release];
[net_port release];


And the result:

2005-02-09 12:39:36.095 qservertest[15120] root = 0x11ece0
2005-02-09 12:39:36.103 qservertest[15120] [root foo] = foo
2005-02-09 12:39:36.106 qservertest[15120] [root respondsToSelector:@selector(descriptionWithLocale:)] = 0
2005-02-09 12:39:36.108 qservertest[15120] [root description] = <QServer: 0x500cc0>
2005-02-09 12:39:36.112 qservertest[15120] root = <QServer: 0x500cc0>


Program received signal EXC_BAD_ACCESS, Could not access memory.
0x908311f4 in objc_msgSend ()
(gdb) bt
#0 0x908311f4 in objc_msgSend ()
#1 0x90a12014 in -[NSInvocation invalidate] ()
#2 0x90a02c4c in -[NSInvocation dealloc] ()
#3 0x909f15d4 in NSPopAutoreleasePool ()
#4 0x90a74abc in NSLog ()
#5 0x00009048 in -[QServerBrowser serverListUpdated] (self=0x100f70, _cmd=0x4ba18) at /Users/toby/projects/PERSONAL/quixotic/source/server/test/ qservertest.mm:173
#6 0x00008bd8 in -[QServerBrowser netServiceDidResolveAddress:] (self=0x100f70, _cmd=0x90b2a9fc, service=0x101350) at /Users/toby/projects/PERSONAL/quixotic/source/server/test/ qservertest.mm:135
#7 0x90a76ce0 in netServiceDispatchCallBack ()
#8 0x927487d4 in NetService::PerformCallBack(NetService*) ()
#9 0x90193ca8 in __CFRunLoopDoSources0 ()
#10 0x90191560 in __CFRunLoopRun ()
#11 0x90195e8c in CFRunLoopRunSpecific ()
#12 0x909fc850 in -[NSRunLoop runMode:beforeDate:] ()
#13 0x90a15454 in -[NSRunLoop run] ()


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