From ce907d42462634d9e8b5af6bb55b6db63df7561b Mon Sep 17 00:00:00 2001 From: Dima Dorfman Date: Wed, 10 Jul 2002 03:29:38 +0000 Subject: Add a VT_LOCKSWITCH ioctl that disallows vty switching. Something like this can be emulated by VT_SETMODEing to VT_PROCESS and never releasing the vty, but this has a number of problems, most notably that a process must stay resident for the lock to be in effect. Reviewed by: roam, sheldonh --- sys/dev/syscons/syscons.c | 14 ++++++++++++++ sys/dev/syscons/syscons.h | 1 + 2 files changed, 15 insertions(+) (limited to 'sys/dev') diff --git a/sys/dev/syscons/syscons.c b/sys/dev/syscons/syscons.c index 02c771a321820..09f35bbb3bbd8 100644 --- a/sys/dev/syscons/syscons.c +++ b/sys/dev/syscons/syscons.c @@ -981,6 +981,13 @@ scioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td) *(int *)data = scp->index + 1; return 0; + case VT_LOCKSWITCH: /* prevent vty switching */ + if ((*(int *)data) & 0x01) + sc->flags |= SC_SCRN_VTYLOCK; + else + sc->flags &= ~SC_SCRN_VTYLOCK; + return 0; + case KDENABIO: /* allow io operations */ error = suser(td); if (error != 0) @@ -2075,6 +2082,13 @@ sc_switch_scr(sc_softc_t *sc, u_int next_scr) DPRINTF(5, ("sc0: sc_switch_scr() %d ", next_scr + 1)); + /* prevent switch if previously requested */ + if (sc->flags & SC_SCRN_VTYLOCK) { + sc_bell(sc->cur_scp, sc->cur_scp->bell_pitch, + sc->cur_scp->bell_duration); + return EPERM; + } + /* delay switch if the screen is blanked or being updated */ if ((sc->flags & SC_SCRN_BLANKED) || sc->write_in_progress || sc->blink_in_progress || sc->videoio_in_progress) { diff --git a/sys/dev/syscons/syscons.h b/sys/dev/syscons/syscons.h index 08e8dfcc44ee6..d08df8bfda057 100644 --- a/sys/dev/syscons/syscons.h +++ b/sys/dev/syscons/syscons.h @@ -194,6 +194,7 @@ typedef struct sc_softc { #define SC_SCRN_IDLE (1 << 5) #define SC_SCRN_BLANKED (1 << 6) #define SC_SAVER_FAILED (1 << 7) +#define SC_SCRN_VTYLOCK (1 << 8) #define SC_INIT_DONE (1 << 16) #define SC_SPLASH_SCRN (1 << 17) -- cgit v1.3