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Convert this driver to (ab?)use line disciplines to get the input it

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needs instead of relying on idiosyncratic hacks in the tty subsystem.
Also add module code since this can now be compiled as a module.

Silence by:	-hackers, -audit
This commit is contained in:
dd 2001-05-22 22:13:14 +00:00
parent 5fd5877aef
commit 3ad1483a6b
2 changed files with 168 additions and 34 deletions
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101
sys/dev/snp/snp.c
View File

@ -15,7 +15,6 @@
* $FreeBSD$
*/
#include "opt_compat.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/filio.h>
@ -29,6 +28,7 @@
#include <sys/kernel.h>
#include <sys/snoop.h>
#include <sys/vnode.h>
#include <sys/conf.h>
static d_open_t snpopen;
static d_close_t snpclose;
@ -61,9 +61,63 @@ static struct cdevsw snp_cdevsw = {
static MALLOC_DEFINE(M_SNP, "snp", "Snoop device data");
#define ttytosnp(t) (struct snoop *)(t)->t_sc
static struct tty *snpdevtotty __P((dev_t dev));
static int snp_detach __P((struct snoop *snp));
/*
* The number of the "snoop" line discipline. This gets determined at
* module load time.
*/
static int mylinedisc;
static int
dsnwrite(struct tty *tp, struct uio *uio, int flag)
{
struct snoop *snp = ttytosnp(tp);
int error = 0;
char ibuf[1024];
int ilen;
struct iovec iov;
struct uio uio2;
while (uio->uio_resid) {
ilen = MIN(sizeof(ibuf), uio->uio_resid);
error = uiomove(ibuf, ilen, uio);
if (error)
break;
snpin(snp, ibuf, ilen);
/* Hackish, but I think it's the least of all evils. */
iov.iov_base = ibuf;
iov.iov_len = ilen;
uio2.uio_iov = &iov;
uio2.uio_iovcnt = 1;
uio2.uio_offset = 0;
uio2.uio_resid = ilen;
uio2.uio_segflg = UIO_SYSSPACE;
uio2.uio_rw = UIO_WRITE;
uio2.uio_procp = uio->uio_procp;
error = ttwrite(tp, &uio2, flag);
if (error)
break;
}
return (error);
}
/*
* XXX should there be a global version of this?
*/
static int
l_nullioctl(struct tty *tp, u_long cmd, char *data, int flags, struct proc *p)
{
return (ENOIOCTL);
}
static struct linesw snpdisc = {
ttyopen, ttylclose, ttread, dsnwrite,
l_nullioctl, ttyinput, ttstart, ttymodem };
static struct tty *
snpdevtotty (dev)
dev_t dev;
@ -98,7 +152,7 @@ snpwrite(dev, uio, flag)
tp = snp->snp_tty;
if ((tp->t_sc == snp) && (tp->t_state & TS_SNOOP) &&
(tp->t_line == OTTYDISC || tp->t_line == NTTYDISC))
tp->t_line == mylinedisc)
goto tty_input;
printf("Snoop: attempt to write to bad tty.\n");
@ -334,9 +388,10 @@ snp_detach(snp)
tp = snp->snp_tty;
if (tp && (tp->t_sc == snp) && (tp->t_state & TS_SNOOP) &&
(tp->t_line == OTTYDISC || tp->t_line == NTTYDISC)) {
tp->t_line == mylinedisc) {
tp->t_sc = NULL;
tp->t_state &= ~TS_SNOOP;
tp->t_line = snp->snp_olddisc;
} else
printf("Snoop: bad attached tty data.\n");
@ -409,12 +464,6 @@ snpioctl(dev, cmd, data, flags, p)
if (!tp)
return (EINVAL);
if ((tp->t_sc != (caddr_t)snp) && (tp->t_state & TS_SNOOP))
return (EBUSY);
if ((tp->t_line != OTTYDISC) && (tp->t_line != NTTYDISC))
return (EBUSY);
s = spltty();
if (snp->snp_target == NODEV) {
@ -425,6 +474,8 @@ snpioctl(dev, cmd, data, flags, p)
tp->t_sc = (caddr_t)snp;
tp->t_state |= TS_SNOOP;
snp->snp_olddisc = tp->t_line;
tp->t_line = mylinedisc;
snp->snp_tty = tp;
snp->snp_target = tdev;
@ -503,8 +554,6 @@ snppoll(dev, events, p)
return (revents);
}
static void snp_drvinit __P((void *unused));
static void
snp_clone(void *arg, char *name, int namelen, dev_t *dev)
{
@ -519,13 +568,31 @@ snp_clone(void *arg, char *name, int namelen, dev_t *dev)
return;
}
static void
snp_drvinit(unused)
void *unused;
static int
snp_modevent(module_t mod, int type, void *data)
{
static eventhandler_tag eh_tag = NULL;
EVENTHANDLER_REGISTER(dev_clone, snp_clone, 0, 1000);
cdevsw_add(&snp_cdevsw);
switch (type) {
case MOD_LOAD:
eh_tag = EVENTHANDLER_REGISTER(dev_clone, snp_clone, 0, 1000);
mylinedisc = ldisc_register(LDISC_LOAD, &snpdisc);
cdevsw_add(&snp_cdevsw);
break;
case MOD_UNLOAD:
EVENTHANDLER_DEREGISTER(dev_clone, eh_tag);
ldisc_deregister(mylinedisc);
cdevsw_remove(&snp_cdevsw);
break;
default:
break;
}
return 0;
}
SYSINIT(snpdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,snp_drvinit,NULL)
static moduledata_t snp_mod = {
"snp",
snp_modevent,
NULL
};
DECLARE_MODULE(snp, snp_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+CDEV_MAJOR);

101
sys/kern/tty_snoop.c
View File

@ -15,7 +15,6 @@
* $FreeBSD$
*/
#include "opt_compat.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/filio.h>
@ -29,6 +28,7 @@
#include <sys/kernel.h>
#include <sys/snoop.h>
#include <sys/vnode.h>
#include <sys/conf.h>
static d_open_t snpopen;
static d_close_t snpclose;
@ -61,9 +61,63 @@ static struct cdevsw snp_cdevsw = {
static MALLOC_DEFINE(M_SNP, "snp", "Snoop device data");
#define ttytosnp(t) (struct snoop *)(t)->t_sc
static struct tty *snpdevtotty __P((dev_t dev));
static int snp_detach __P((struct snoop *snp));
/*
* The number of the "snoop" line discipline. This gets determined at
* module load time.
*/
static int mylinedisc;
static int
dsnwrite(struct tty *tp, struct uio *uio, int flag)
{
struct snoop *snp = ttytosnp(tp);
int error = 0;
char ibuf[1024];
int ilen;
struct iovec iov;
struct uio uio2;
while (uio->uio_resid) {
ilen = MIN(sizeof(ibuf), uio->uio_resid);
error = uiomove(ibuf, ilen, uio);
if (error)
break;
snpin(snp, ibuf, ilen);
/* Hackish, but I think it's the least of all evils. */
iov.iov_base = ibuf;
iov.iov_len = ilen;
uio2.uio_iov = &iov;
uio2.uio_iovcnt = 1;
uio2.uio_offset = 0;
uio2.uio_resid = ilen;
uio2.uio_segflg = UIO_SYSSPACE;
uio2.uio_rw = UIO_WRITE;
uio2.uio_procp = uio->uio_procp;
error = ttwrite(tp, &uio2, flag);
if (error)
break;
}
return (error);
}
/*
* XXX should there be a global version of this?
*/
static int
l_nullioctl(struct tty *tp, u_long cmd, char *data, int flags, struct proc *p)
{
return (ENOIOCTL);
}
static struct linesw snpdisc = {
ttyopen, ttylclose, ttread, dsnwrite,
l_nullioctl, ttyinput, ttstart, ttymodem };
static struct tty *
snpdevtotty (dev)
dev_t dev;
@ -98,7 +152,7 @@ snpwrite(dev, uio, flag)
tp = snp->snp_tty;
if ((tp->t_sc == snp) && (tp->t_state & TS_SNOOP) &&
(tp->t_line == OTTYDISC || tp->t_line == NTTYDISC))
tp->t_line == mylinedisc)
goto tty_input;
printf("Snoop: attempt to write to bad tty.\n");
@ -334,9 +388,10 @@ snp_detach(snp)
tp = snp->snp_tty;
if (tp && (tp->t_sc == snp) && (tp->t_state & TS_SNOOP) &&
(tp->t_line == OTTYDISC || tp->t_line == NTTYDISC)) {
tp->t_line == mylinedisc) {
tp->t_sc = NULL;
tp->t_state &= ~TS_SNOOP;
tp->t_line = snp->snp_olddisc;
} else
printf("Snoop: bad attached tty data.\n");
@ -409,12 +464,6 @@ snpioctl(dev, cmd, data, flags, p)
if (!tp)
return (EINVAL);
if ((tp->t_sc != (caddr_t)snp) && (tp->t_state & TS_SNOOP))
return (EBUSY);
if ((tp->t_line != OTTYDISC) && (tp->t_line != NTTYDISC))
return (EBUSY);
s = spltty();
if (snp->snp_target == NODEV) {
@ -425,6 +474,8 @@ snpioctl(dev, cmd, data, flags, p)
tp->t_sc = (caddr_t)snp;
tp->t_state |= TS_SNOOP;
snp->snp_olddisc = tp->t_line;
tp->t_line = mylinedisc;
snp->snp_tty = tp;
snp->snp_target = tdev;
@ -503,8 +554,6 @@ snppoll(dev, events, p)
return (revents);
}
static void snp_drvinit __P((void *unused));
static void
snp_clone(void *arg, char *name, int namelen, dev_t *dev)
{
@ -519,13 +568,31 @@ snp_clone(void *arg, char *name, int namelen, dev_t *dev)
return;
}
static void
snp_drvinit(unused)
void *unused;
static int
snp_modevent(module_t mod, int type, void *data)
{
static eventhandler_tag eh_tag = NULL;
EVENTHANDLER_REGISTER(dev_clone, snp_clone, 0, 1000);
cdevsw_add(&snp_cdevsw);
switch (type) {
case MOD_LOAD:
eh_tag = EVENTHANDLER_REGISTER(dev_clone, snp_clone, 0, 1000);
mylinedisc = ldisc_register(LDISC_LOAD, &snpdisc);
cdevsw_add(&snp_cdevsw);
break;
case MOD_UNLOAD:
EVENTHANDLER_DEREGISTER(dev_clone, eh_tag);
ldisc_deregister(mylinedisc);
cdevsw_remove(&snp_cdevsw);
break;
default:
break;
}
return 0;
}
SYSINIT(snpdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,snp_drvinit,NULL)
static moduledata_t snp_mod = {
"snp",
snp_modevent,
NULL
};
DECLARE_MODULE(snp, snp_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+CDEV_MAJOR);