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Add ttyopen and ttyclose functions which will do the right stuff for

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most if not all of our tty drivers in the future.

Centralizing this stuff enables us to remove about 100 lines of
almost but not quite perfectly copy&paste code from each tty driver.
This commit is contained in:
Poul-Henning Kamp 2004-09-17 11:43:35 +00:00
parent c483711411
commit e8d3e08098
1 changed files with 97 additions and 0 deletions
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97
sys/kern/tty.c
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@ -104,6 +104,7 @@ __FBSDID("$FreeBSD$");
#include <sys/filedesc.h>
#include <sys/sched.h>
#include <sys/sysctl.h>
#include <sys/timepps.h>
#include <vm/vm.h>
#include <vm/pmap.h>
@ -2878,6 +2879,102 @@ nottystop(struct tty *tp, int rw)
return;
}
int
ttyopen(struct cdev *dev, int flag, int mode, struct thread *td)
{
int error;
int s;
struct tty *tp;
tp = dev->si_tty;
s = spltty();
/*
* We jump to this label after all non-interrupted sleeps to pick
* up any changes of the device state.
*/
open_top:
if (tp->t_state & TS_GONE)
return (ENXIO);
error = ttydtrwaitsleep(tp);
if (error)
goto out;
if (tp->t_state & TS_ISOPEN) {
/*
* The device is open, so everything has been initialized.
* Handle conflicts.
*/
if (ISCALLOUT(dev) && !tp->t_actout)
return (EBUSY);
if (tp->t_actout && !ISCALLOUT(dev)) {
if (flag & O_NONBLOCK)
return (EBUSY);
error = tsleep(&tp->t_actout,
TTIPRI | PCATCH, "siobi", 0);
if (error != 0 || (tp->t_flags & TS_GONE))
goto out;
goto open_top;
}
if (tp->t_state & TS_XCLUDE && suser(td))
return (EBUSY);
} else {
/*
* The device isn't open, so there are no conflicts.
* Initialize it. Initialization is done twice in many
* cases: to preempt sleeping callin opens if we are
* callout, and to complete a callin open after DCD rises.
*/
tp->t_termios = ISCALLOUT(dev) ? tp->t_init_out : tp->t_init_in;
tp->t_modem(tp, SER_DTR | SER_RTS, 0);
++tp->t_wopeners;
error = tp->t_param(tp, &tp->t_termios);
--tp->t_wopeners;
if (error == 0 && tp->t_open != NULL)
error = tp->t_open(tp, dev);
if (error != 0)
goto out;
if (ISCALLOUT(dev) || (tp->t_modem(tp, 0, 0) & SER_DCD))
ttyld_modem(tp, 1);
}
/*
* Wait for DCD if necessary.
*/
if (!(tp->t_state & TS_CARR_ON) && !ISCALLOUT(dev)
&& !(tp->t_cflag & CLOCAL) && !(flag & O_NONBLOCK)) {
++tp->t_wopeners;
error = tsleep(TSA_CARR_ON(tp), TTIPRI | PCATCH, "ttydcd", 0);
--tp->t_wopeners;
if (error != 0 || (tp->t_state & TS_GONE))
goto out;
goto open_top;
}
error = ttyld_open(tp, dev);
ttyldoptim(tp);
if (tp->t_state & TS_ISOPEN && ISCALLOUT(dev))
tp->t_actout = TRUE;
out:
splx(s);
if (!(tp->t_state & TS_ISOPEN) && tp->t_wopeners == 0)
tp->t_close(tp);
return (error);
}
int
ttyclose(struct cdev *dev, int flag, int mode, struct thread *td)
{
struct tty *tp;
tp = dev->si_tty;
ttyld_close(tp, flag);
ttyldoptim(tp);
tp->t_close(tp);
tty_close(tp);
tp->t_do_timestamp = 0;
if (tp->t_pps != NULL)
tp->t_pps->ppsparam.mode = 0;
return (0);
}
int
ttyread(struct cdev *dev, struct uio *uio, int flag)
{