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Set it so you can add and remove line disciplines without replicating

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code for looking for open slots in table (and you could hide the table
if you wanted to).
This commit is contained in:
Peter Dufault 1995-03-21 11:24:05 +00:00
parent e8d9ff42ce
commit 3749fcff67
3 changed files with 72 additions and 3 deletions
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63
sys/kern/tty_conf.c
View File

@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)tty_conf.c 8.4 (Berkeley) 1/21/94
* $Id: tty_conf.c,v 1.3 1994/08/02 07:42:50 davidg Exp $
* $Id: tty_conf.c,v 1.4 1994/10/05 21:22:24 wollman Exp $
*/
#include <sys/param.h>
@ -89,6 +89,67 @@ struct linesw linesw[MAXLDISC] =
int nlinesw = sizeof (linesw) / sizeof (linesw[0]);
static struct linesw nodisc =
{
ttynodisc,
ttyerrclose,
ttyerrio,
ttyerrio,
nullioctl,
ttyerrinput,
ttyerrstart,
nullmodem
};
#define LOADABLE_LDISC 6
/*
* ldisc_register: Register a line discipline.
*
* discipline: Index for discipline to load, or LDISC_LOAD for us to choose.
* linesw_p: Pointer to linesw_p.
*
* Returns: Index used or -1 on failure.
*/
int
ldisc_register(discipline, linesw_p)
int discipline;
struct linesw *linesw_p;
{
int slot = -1;
if (discipline == LDISC_LOAD) {
int i;
for (i = LOADABLE_LDISC; i < MAXLDISC; i++)
if (bcmp(linesw + i, &nodisc, sizeof(nodisc)) == 0) {
slot = i;
}
}
else if (discipline >= 0 && discipline < MAXLDISC) {
slot = discipline;
}
if (slot != -1 && linesw_p)
linesw[slot] = *linesw_p;
return slot;
}
/*
* ldisc_deregister: Deregister a line discipline obtained with
* ldisc_register. Can only deregister "loadable" ones now.
*
* discipline: Index for discipline to unload.
*/
void
ldisc_deregister(discipline)
int discipline;
{
if (discipline >= LOADABLE_LDISC && discipline < MAXLDISC) {
linesw[discipline] = nodisc;
}
}
/*
* Do nothing specific version of line
* discipline specific ioctl command.

6
sys/sys/conf.h
View File

@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)conf.h 8.3 (Berkeley) 1/21/94
* $Id: conf.h,v 1.9 1995/02/25 20:09:36 pst Exp $
* $Id: conf.h,v 1.10 1995/03/16 18:16:13 bde Exp $
*/
#ifndef _SYS_CONF_H_
@ -121,6 +121,10 @@ struct linesw {
#ifdef KERNEL
extern struct linesw linesw[];
extern int nlinesw;
int ldisc_register __P((int , struct linesw *));
void ldisc_deregister __P((int));
#define LDISC_LOAD -1 /* Loadable line discipline */
#endif
struct swdevt {

6
sys/sys/linedisc.h
View File

@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)conf.h 8.3 (Berkeley) 1/21/94
* $Id: conf.h,v 1.9 1995/02/25 20:09:36 pst Exp $
* $Id: conf.h,v 1.10 1995/03/16 18:16:13 bde Exp $
*/
#ifndef _SYS_CONF_H_
@ -121,6 +121,10 @@ struct linesw {
#ifdef KERNEL
extern struct linesw linesw[];
extern int nlinesw;
int ldisc_register __P((int , struct linesw *));
void ldisc_deregister __P((int));
#define LDISC_LOAD -1 /* Loadable line discipline */
#endif
struct swdevt {