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Devfs isn't quite dead yet... Add back devfs support to ptys..

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When you use pty(N) it creates pty(N+1) ready for your use in the DEVFS,
so DEVFS is not cluttered up with hundreds of ptys you are never going to
use.
This commit is contained in:
Julian Elischer 1999-08-17 23:08:51 +00:00
parent 38c808edb7
commit 944494356b
1 changed files with 36 additions and 1 deletions
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37
sys/kern/tty_pty.c
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@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)tty_pty.c 8.4 (Berkeley) 2/20/95
* $Id: tty_pty.c,v 1.62 1999/08/08 19:28:50 phk Exp $
* $Id: tty_pty.c,v 1.63 1999/08/08 19:47:32 phk Exp $
*/
/*
@ -40,6 +40,7 @@
*/
#include "pty.h" /* XXX */
#include "opt_compat.h"
#include "opt_devfs.h"
#include <sys/param.h>
#include <sys/systm.h>
@ -56,6 +57,10 @@
#include <sys/signalvar.h>
#include <sys/malloc.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif /*DEVFS*/
MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
static void ptsstart __P((struct tty *tp));
@ -129,6 +134,10 @@ struct pt_ioctl {
u_char pt_send;
u_char pt_ucntl;
struct tty pt_tty;
#ifdef DEVFS
void *devfs_token_pts;
void *devfs_token_ptc;
#endif /* DEVFS */
};
#define PF_PKT 0x08 /* packet mode */
@ -168,6 +177,14 @@ ptyinit(n)
devs->si_drv1 = devc->si_drv1 = pt;
devs->si_tty_tty = devc->si_tty_tty = &pt->pt_tty;
ttyregister(&pt->pt_tty);
#ifdef DEVFS
pt->devfs_token_pts = devfs_add_devswf(&pts_cdevsw,n,
DV_CHR,0,0,0666,
devs->si_name);
pt->devfs_token_ptc = devfs_add_devswf(&ptc_cdevsw,n,
DV_CHR,0,0,0666,
devc->si_name);
#endif /* DEVFS */
}
/*ARGSUSED*/
@ -179,7 +196,22 @@ ptsopen(dev, flag, devtype, p)
{
register struct tty *tp;
int error;
#ifdef DEVFS
int minr;
dev_t nextdev;
/*
* If we openned this device, ensure we have the
* next ready in the DEVFS (up to 256 of them).
*/
minr = lminor(dev);
if (minr < 255) {
nextdev = makedev(major(dev), minr + 1);
if (!nextdev->si_drv1) {
ptyinit(minr + 1);
}
}
#endif /* DEVFS */
if (!dev->si_drv1)
ptyinit(minor(dev));
if (!dev->si_drv1)
@ -827,6 +859,9 @@ ptc_drvinit(unused)
cdevsw_add(&ptc_cdevsw);
ptc_devsw_installed = 1;
}
#ifdef DEVFS
ptyinit(0); /* Add the first pty into the system.. prime the pump */
#endif /* DEVFS */
}
SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)