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Better approximation for TIOCGETP (gtty) for non-standard speeds.

Browse source 
Old variant returns 38400 for them, now it returns nearest matched
rounded down, expect speeds in range 0 > speed < 50 rounded up
to not produce hangup.
This commit is contained in:
Andrey A. Chernov 1995-08-02 12:03:12 +00:00
parent 29ae13ad3c
commit 4e5f73581c
1 changed files with 18 additions and 9 deletions
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27
sys/kern/tty_compat.c
View file

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)tty_compat.c 8.1 (Berkeley) 6/10/93
* $Id: tty_compat.c,v 1.14 1995/08/01 23:27:36 ache Exp $
* $Id: tty_compat.c,v 1.15 1995/08/02 06:55:35 ache Exp $
*/
/*
@ -80,9 +80,22 @@ static struct speedtab compatspeeds[] = {
};
static int compatspcodes[] = {
0, 50, 75, 110, 134, 150, 200, 300, 600, 1200,
1800, 2400, 4800, 9600, 19200, 38400, 57600, 115200,
1800, 2400, 4800, 9600, 19200, 38400, 57600, 115200
};
static
int ttcompatspeedtab(speed, table)
int speed;
register struct speedtab *table;
{
if (speed == 0)
return (0); /* hangup */
for ( ; table->sp_speed > 0; table++)
if (table->sp_speed <= speed) /* nearest one, rounded down */
return (table->sp_code);
return (1); /* 50, min and not hangup */
}
int ttsetcompat(tp, com, data, term)
register struct tty *tp;
int *com;
@ -187,16 +200,12 @@ ttcompat(tp, com, data, flag)
case TIOCGETP: {
register struct sgttyb *sg = (struct sgttyb *)data;
register cc_t *cc = tp->t_cc;
register speed;
speed = ttspeedtab(tp->t_ospeed, compatspeeds);
sg->sg_ospeed = (speed == -1) ? MAX_SPEED : speed;
sg->sg_ospeed = ttcompatspeedtab(tp->t_ospeed, compatspeeds);
if (tp->t_ispeed == 0)
sg->sg_ispeed = sg->sg_ospeed;
else {
speed = ttspeedtab(tp->t_ispeed, compatspeeds);
sg->sg_ispeed = (speed == -1) ? MAX_SPEED : speed;
}
else
sg->sg_ispeed = ttcompatspeedtab(tp->t_ispeed, compatspeeds);
sg->sg_erase = cc[VERASE];
sg->sg_kill = cc[VKILL];
sg->sg_flags = tp->t_flags = ttcompatgetflags(tp);