Date: Tue, 17 Dec 2013 22:18:16 +0100 From: Eivind Evensen <eivinde@terraplane.org> To: freebsd-stable@freebsd.org Subject: Support DISCARD (^O) Message-ID: <20131217211816.GA41797@klump.hjerdalen.lokalnett>
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Hello. I don't know if there is any particular reason that support for DISCARD/^O was not included in the tty rewrite that happened from FreeBSD 7 to 8, but in case anybody else wants it, here's a diff functioning mostly like in 7, except output isn't switched back on automatically on input. Diff is against FreeBSD 8, however, last time I checked I didn't see much difference in the newer versions. Regards, Eivind diff -r 91820d9948e0 -r 13f40d577646 sys/kern/tty_ttydisc.c --- a/sys/kern/tty_ttydisc.c Fri Feb 22 09:45:32 2013 +0100 +++ b/sys/kern/tty_ttydisc.c Tue Dec 17 23:03:17 2013 +0100 @@ -448,6 +448,9 @@ if (tp->t_flags & TF_ZOMBIE) return (EIO); + if (tp->t_termios.c_lflag & FLUSHO) + return (0); + /* * We don't need to check whether the process is the foreground * process group or if we have a carrier. This is already done @@ -881,6 +884,14 @@ /* Special control characters that are implementation dependent. */ if (CMP_FLAG(l, IEXTEN)) { + /* Discard (^O) */ + if (CMP_CC(VDISCARD, c)) { + if (!(tp->t_termios.c_lflag & FLUSHO)) + ttyoutq_write_nofrag(&tp->t_outq, "^O", 2); + tp->t_termios.c_lflag ^= FLUSHO; + return(0); + } + /* Accept the next character as literal. */ if (CMP_CC(VLNEXT, c)) { if (CMP_FLAG(l, ECHO)) {
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