Out of curiosity, and to get more information, you could try: a) use FD_ISSET(2) to see if O_NONBLOCK is really set on the socket. If so, use FD_ZERO(2)/FD_SET(2) to clear O_NONBLOCK on the socket prior to read(2). c) use a select(2) call in front of the read(2) I would suspect O_NONBLOCK really isn't set, and there is more going on here than meets the eye... HTH, -Carl
On Oct 27, 2016, at 3:15 PM, Jeremy Thompson <jeremy@warehousesports.com> wrote:
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 _______________________________________________ Do not post admin requests to the list. They will be ignored. Macnetworkprog mailing list (Macnetworkprog@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/macnetworkprog/newslists%40autonomy....
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