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Allow the buffer size to be configured for pseudo-like TTY devices.

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Devices that don't implement param() (which means they don't support
hardware parameters such as flow control, baud rate) hardcode the baud
rate to TTYDEF_SPEED. This means the buffer size cannot be configured,
which is a little inconvenient when using canonical mode with big lines
of input, etc.

Make it adjustable, but do clamp it between B50 and B115200 to prevent
awkward buffer sizes. Remove the baud rate assignment from
/etc/gettytab. Trust the kernel to fill in a proper value.

Reported by:	Mikolaj Golub <to my trociny gmail com>
MFC after:	1 month
This commit is contained in:
Ed Schouten 2009-10-18 19:48:53 +00:00
parent 99087885be
commit 5ed8d12443
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=198214
2 changed files with 14 additions and 3 deletions
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2
etc/gettytab
View File

@ -162,7 +162,7 @@ X|Xwindow|X window system:\
:fd@:nd@:cd@:rw:sp#9600:
P|Pc|Pc console:\
:ht:np:sp#115200:
:ht:np:
#
# Wierdo special case for fast crt's with hardcopy devices

15
sys/kern/tty.c
View File

@ -870,8 +870,19 @@ static int
ttydevsw_defparam(struct tty *tp, struct termios *t)
{
/* Use a fake baud rate, we're not a real device. */
t->c_ispeed = t->c_ospeed = TTYDEF_SPEED;
/*
* Allow the baud rate to be adjusted for pseudo-devices, but at
* least restrict it to 115200 to prevent excessive buffer
* usage. Also disallow 0, to prevent foot shooting.
*/
if (t->c_ispeed < B50)
t->c_ispeed = B50;
else if (t->c_ispeed > B115200)
t->c_ispeed = B115200;
if (t->c_ospeed < B50)
t->c_ospeed = B50;
else if (t->c_ospeed > B115200)
t->c_ospeed = B115200;
return (0);
}