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 <jer...@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.caltech.edu > > This email sent to newsli...@autonomy.caltech.edu _______________________________________________ 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/archive%40mail-archive.com This email sent to arch...@mail-archive.com
