I have a strange problem that has showed up in OS X 10.11 and 10.12. My application is still using carbon libraries but all network communication is done through BSD sockets. When running the application on 10.11 in debug mode certain times the read() call will return with this error Resource temporarily unavailable. I could see this happening if the socket was in non-blocking mode but it is supposed to block. The resource temporarily unavailable error comes from perror. I tried getting the error from the socket with getsockopt and it returns an undefined error: 0. To make this a little bit more strange if I run this application in release mode none of this comes up. However, now in 10.12 i get this error in both debug and release mode. I first thought this may be a problem on the server side but it sends back correct data on a wireshark capture. I’m pretty sure its locked down to the client application. If I didn’t know better I would say that the socket is somehow getting set to non-blocking but I can’t prove it. This problem is nonexistent on 10.9 but I am unsure about 10.10 as I never debugged the code on that version. Any info would be greatly appreciated.
Thanks, Jeremy
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