diff options
Diffstat (limited to 'sys/kern/tty_cons.c')
| -rw-r--r-- | sys/kern/tty_cons.c | 76 |
1 files changed, 50 insertions, 26 deletions
diff --git a/sys/kern/tty_cons.c b/sys/kern/tty_cons.c index f4e2484..bcbba1b 100644 --- a/sys/kern/tty_cons.c +++ b/sys/kern/tty_cons.c @@ -36,23 +36,17 @@ * SUCH DAMAGE. * * from: @(#)cons.c 7.2 (Berkeley) 5/9/91 - * $Id: cons.c,v 1.18 1994/12/18 19:35:09 joerg Exp $ + * $Id: cons.c,v 1.19 1994/12/18 19:42:41 joerg Exp $ */ - #include <sys/param.h> #include <sys/systm.h> +#include <sys/conf.h> #include <sys/proc.h> -#include <sys/user.h> -#include <sys/buf.h> -#include <sys/ioctl.h> #include <sys/tty.h> -#include <sys/file.h> -#include <sys/conf.h> -#include <sys/vnode.h> -#include <machine/stdarg.h> #include <machine/cons.h> +#include <machine/stdarg.h> /* XXX - all this could be autoconfig()ed */ #include "sc.h" @@ -66,7 +60,7 @@ int pccnprobe(), pccninit(), pccngetc(), pccncheckc(), pccnputc(); int siocnprobe(), siocninit(), siocngetc(), siocncheckc(), siocnputc(); #endif -struct consdev constab[] = { +static struct consdev constab[] = { #if NSC > 0 || NVT > 0 { pccnprobe, pccninit, pccngetc, pccncheckc, pccnputc }, #endif @@ -78,13 +72,24 @@ struct consdev constab[] = { /* end XXX */ struct tty *constty = 0; /* virtual console output device */ -struct consdev *cn_tab; /* physical console device info */ struct tty *cn_tty; /* XXX: console tty struct for tprintf */ +/* XXX */ +typedef u_char bool_t; +typedef int d_close_t __P((dev_t dev, int fflag, int devtype, struct proc *p)); +typedef int d_open_t __P((dev_t dev, int oflags, int devtype, struct proc *p)); + +static bool_t cn_is_open; /* nonzero if logical console is open */ +static bool_t cn_phys_is_open; /* nonzero if physical console is open */ +static d_close_t *cn_phys_close; /* physical device close function */ +static d_open_t *cn_phys_open; /* physical device open function */ +static struct consdev *cn_tab; /* physical console device info */ + void cninit() { register struct consdev *cp; + struct cdevsw *cdp; /* * Collect information about all possible consoles @@ -97,11 +102,19 @@ cninit() cn_tab = cp; } /* - * No console, we can handle it + * No console, give up. */ if ((cp = cn_tab) == NULL) return; /* + * Hook the open and close functions. + */ + cdp = &cdevsw[major(cn_tab->cn_dev)]; + cn_phys_close = cdp->d_close; + cdp->d_close = cnclose; + cn_phys_open = cdp->d_open; + cdp->d_open = cnopen; + /* * Turn on console */ cn_tty = cp->cn_tp; @@ -114,16 +127,21 @@ cnopen(dev, flag, mode, p) int flag, mode; struct proc *p; { - struct vnode *vp = 0; + dev_t cndev, physdev; + int retval; if (cn_tab == NULL) return (0); - - dev = cn_tab->cn_dev; - if (vfinddev(dev, VCHR, &vp) && vcount(vp)) - return (0); - - return ((*cdevsw[major(dev)].d_open)(dev, flag, mode, p)); + cndev = cn_tab->cn_dev; + physdev = (major(dev) == major(cndev) ? dev : cndev); + retval = (*cn_phys_open)(physdev, flag, mode, p); + if (retval == 0) { + if (dev == cndev) + cn_phys_is_open = 1; + else if (physdev == cndev) + cn_is_open = 1; + } + return (retval); } int @@ -132,16 +150,22 @@ cnclose(dev, flag, mode, p) int flag, mode; struct proc *p; { - struct vnode *vp = 0; + dev_t cndev; if (cn_tab == NULL) return (0); - - dev = cn_tab->cn_dev; - if (vfinddev(dev, VCHR, &vp) && vcount(vp)) - return (0); - - return ((*cdevsw[major(dev)].d_close)(dev, flag, mode, p)); + cndev = cn_tab->cn_dev; + if (dev == cndev) { + cn_phys_is_open = 0; + if (cn_is_open) + return (0); + } else if (major(dev) != major(cndev)) { + cn_is_open = 0; + if (cn_phys_is_open) + return (0); + dev = cndev; + } + return ((*cn_phys_close)(dev, flag, mode, p)); } int |
