On Jul 2, 2014, at 5:34 PM, Jerry Krinock <je...@ieee.org> wrote: > I’m writing a tool which receives data streamed into stdin by my Google > Chrome extension (using their new Native Messaging API). I think they use > stdin for such interprocess communication in order to make it cross-platform. > > Anyhow, I was surprised to find that the following code, which repeatedly > invokes -waitForDataInBackgroundAndNotify and -availableData on > +[NSFileHandle fileHandleWithStandardInput], delivers no more than 4096 bytes > on each iteration. It just stops at 4096, and the next -availableData starts > with the next byte. > > Although it was fun to write the code to buffer and stitch the message fields > and length fields back together, I’d like to know what is causing these 4K > breaks.
The kernel, probably. Output streamed from one process to another needs to be buffered somewhere. I think the kernel's pipe and/or pty implementation uses a 4K buffer. -- Greg Parker gpar...@apple.com Runtime Wrangler _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
