Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 7/7/83; site rlgvax.UUCP Path: utzoo!linus!philabs!seismo!rlgvax!guy From: guy@rlgvax.UUCP Newsgroups: net.bugs.usg Subject: Bug in no-delay read in System III Message-ID: <806@rlgvax.UUCP> Date: Sun, 10-Jul-83 03:20:22 EDT Article-I.D.: rlgvax.806 Posted: Sun Jul 10 03:20:22 1983 Date-Received: Mon, 11-Jul-83 00:00:14 EDT Organization: CCI Office Systems Group, Reston, VA Lines: 23 To quote from something sent out with (Warren Montgomery's?) EMACS: EMACS has been changed to take advantage of no-delay tty/io... IN UNIX 3.0 and UNIX 3.0.1 (System III is 3.0.1 - gh) as released, the NDELAY option on I/O does not work (read always returns 0). ...On our system, we fixed this bug by changing lines 488-500 of /usr/src/uts/pdp11/io/tty.c FROM if (tq->c_cc == 0) if (u.u_fmode&FNDELAY) return; TO if (tq->t_cc == 0) if (u.u_fmode&FNDELAY && tp->t_rawq.c_cc == 0) return; Guy Harris Computer Consoles, Inc. Office Systems Group {seismo,mcnc,we13,brl-bmd,allegra}!rlgvax!guy