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Add a VT_LOCKSWITCH ioctl that disallows vty switching. Something

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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
This commit is contained in:
Dima Dorfman 2002-07-10 03:29:38 +00:00
parent f55348f07c
commit ce907d4246
3 changed files with 18 additions and 0 deletions
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14
sys/dev/syscons/syscons.c
View File

@ -981,6 +981,13 @@ scioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td)
*(int *)data = scp->index + 1; *(int *)data = scp->index + 1;
return 0; 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 */ case KDENABIO: /* allow io operations */
error = suser(td); error = suser(td);
if (error != 0) 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)); 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 */ /* delay switch if the screen is blanked or being updated */
if ((sc->flags & SC_SCRN_BLANKED) || sc->write_in_progress if ((sc->flags & SC_SCRN_BLANKED) || sc->write_in_progress
|| sc->blink_in_progress || sc->videoio_in_progress) { || sc->blink_in_progress || sc->videoio_in_progress) {

1
sys/dev/syscons/syscons.h
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@ -194,6 +194,7 @@ typedef struct sc_softc {
#define SC_SCRN_IDLE (1 << 5) #define SC_SCRN_IDLE (1 << 5)
#define SC_SCRN_BLANKED (1 << 6) #define SC_SCRN_BLANKED (1 << 6)
#define SC_SAVER_FAILED (1 << 7) #define SC_SAVER_FAILED (1 << 7)
#define SC_SCRN_VTYLOCK (1 << 8)
#define SC_INIT_DONE (1 << 16) #define SC_INIT_DONE (1 << 16)
#define SC_SPLASH_SCRN (1 << 17) #define SC_SPLASH_SCRN (1 << 17)

3
sys/sys/consio.h
View File

@ -335,6 +335,9 @@ typedef struct vt_mode vtmode_t;
/* get the index of the vty */ /* get the index of the vty */
#define VT_GETINDEX _IOR('v', 8, int) #define VT_GETINDEX _IOR('v', 8, int)
/* prevent switching vtys */
#define VT_LOCKSWITCH _IOW('v', 9, int)
/* /*
* Video mode switching ioctl. See sys/fbio.h for mode numbers. * Video mode switching ioctl. See sys/fbio.h for mode numbers.
*/ */