问题
I'm working on sending message through UDP. However, I've been trapped in the problem about 'binding port'.
When I built the project on iOS simulator first time, nothing strange happened. Everything was fine.
But when I built the project second time. I got an error message from terminal when the app tried to bind port.
The message goes like this "Error Domain=NSPOSIXErrorDomain Code=48 "Address already in use" UserInfo=0x767c830 {NSLocalizedFailureReason=Error in bind() function, NSLocalizedDescription=Address already in use}"
What's confuses me is that the error didn't appear when I run my app on iPad.
I guess that maybe it is for the reason that I didn't close the socket. But why it goes correctly on iPad？
Hope someone could solve this. Thx!
回答1:
Current head of GDAAsyncUdpSocket does not (also) set SO_REUSEPORT (it just does ADDRESS, which is quite enough for TCP).
I just popped in a quick fix:
https://github.com/dirkx/CocoaAsyncSocket/commit/5ec8c83d59ecb754824f706198eb62e29961c1be
https://github.com/dirkx/CocoaAsyncSocket
and it should get fixed upstream too:
https://github.com/robbiehanson/CocoaAsyncSocket/pull/159
Thanks,
Dw.
来源：https://stackoverflow.com/questions/16838513/gcdasyncudpsocket-cannot-bind-port-on-ios-simulator