diff options
Diffstat (limited to 'sys/kern')
| -rw-r--r-- | sys/kern/tty_cons.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/sys/kern/tty_cons.c b/sys/kern/tty_cons.c index 6189d72..a0e92f1 100644 --- a/sys/kern/tty_cons.c +++ b/sys/kern/tty_cons.c @@ -56,6 +56,7 @@ #include "sys/tty.h" #include "sys/file.h" #include "sys/conf.h" +#include "sys/vnode.h" #include "cons.h" @@ -105,14 +106,25 @@ cninit() (*cp->cn_init)(cp); } +static struct vnode *cnopenvp = NULLVP; + + cnopen(dev, flag, mode, p) dev_t dev; int flag, mode; struct proc *p; { + int error; + + if (cn_tab == NULL) return (0); dev = cn_tab->cn_dev; + if (cnopenvp == NULLVP) + if ((error = getdevvp(dev, &cnopenvp, VCHR))) { + printf("cnopen: getdevvp returned %d !\n", error); + return(error); + } return ((*cdevsw[major(dev)].d_open)(dev, flag, mode, p)); } @@ -121,10 +133,21 @@ cnclose(dev, flag, mode, p) int flag, mode; struct proc *p; { + int error; + + if (cn_tab == NULL) return (0); dev = cn_tab->cn_dev; - return ((*cdevsw[major(dev)].d_close)(dev, flag, mode, p)); + if (vcount(cnopenvp) <= 1) + error = (*cdevsw[major(dev)].d_close)(dev, flag, mode, p); + else + error = 0; + if (error == 0) { + vrele(cnopenvp); + cnopenvp = NULLVP; + return(error); + } } cnread(dev, uio, flag) |
