site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com Organization: Rogue Research Hi all, I am writing some code to work with an RS-232 serial device (via USB adapter). It basically works. All the IOKit parts are fine, and I end up with a file descriptor and then use the posix read() and write() APIs. The read() man page says "The system guarantees to read the number of bytes requested if the descriptor references a normal file that has that many bytes left before the end-of-file, but in no other case." Indeed with my serial device, if I say to read 15 bytes it sometimes returns after reading 10 bytes. Is there anyway to have read() block until the requested length is ready? Is my only other choice some kind of loop that calls read() and usleep() over and over? If so, how do I choose a sleep duration? Thanks! -- ____________________________________________________________ Sean McBride, B. Eng sean@rogue-research.com Rogue Research www.rogue-research.com Mac Software Developer Montréal, Québec, Canada _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.appl... This email sent to site_archiver@lists.apple.com