Date: Thu, 26 Dec 2013 18:09:46 +0400 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: Eivind Evensen <eivinde@terraplane.org> Cc: freebsd-stable@freebsd.org Subject: Re: Support DISCARD (^O) Message-ID: <20131226140946.GA43173@zxy.spb.ru> In-Reply-To: <20131217211816.GA41797@klump.hjerdalen.lokalnett> References: <20131217211816.GA41797@klump.hjerdalen.lokalnett>
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On Tue, Dec 17, 2013 at 10:18:16PM +0100, Eivind Evensen wrote:
> 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
Nice! Very nice feature, need to commit in the tree.
> 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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