The "don't enqueue stuff" semantics of K_OFF shouldn't be a function of the keyboard map state; we should be able to switch among cooked/raw/ unicode without changing whether events are delivered. Otherwise - if changing to K_UNICODE undoes K_OFF - then suddenly Alt-F2 under Gnome will switch VT instead of summoning the "run command" dialog.
Add a new KD[GS]KBMUTE ioctl pair that allows events to be muted independently of map state. v2: Leave K_OFF in place at Alan's suggestion. Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=859485 Cc: Arthur Taylor <a...@ified.ca> Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org> Tested-by: Josh Boyer <jwbo...@redhat.com> Signed-off-by: Adam Jackson <a...@redhat.com> --- drivers/tty/vt/keyboard.c | 42 ++++++++++++++++++++++++++++++++++++++---- drivers/tty/vt/vt_ioctl.c | 13 +++++++++++++ include/linux/kbd_kern.h | 3 ++- include/linux/vt_kern.h | 2 ++ include/uapi/linux/kd.h | 4 ++++ 5 files changed, 59 insertions(+), 5 deletions(-) diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c index 681765b..20ebdad 100644 --- a/drivers/tty/vt/keyboard.c +++ b/drivers/tty/vt/keyboard.c @@ -642,6 +642,11 @@ static void fn_null(struct vc_data *vc) do_compute_shiftstate(); } +static bool kbd_is_muted(void) +{ + return (kbd->kbdmode == VC_OFF) || vc_kbd_mode(kbd, VC_MUTE); +} + /* * Special key handlers */ @@ -657,7 +662,7 @@ static void k_spec(struct vc_data *vc, unsigned char value, char up_flag) return; if ((kbd->kbdmode == VC_RAW || kbd->kbdmode == VC_MEDIUMRAW || - kbd->kbdmode == VC_OFF) && + kbd_is_muted()) value != KVAL(K_SAK)) return; /* SAK is allowed even in raw mode */ fn_handler[value](vc); @@ -1381,7 +1386,7 @@ static void kbd_keycode(unsigned int keycode, int down, int hw_raw) if (rc == NOTIFY_STOP) return; - if ((raw_mode || kbd->kbdmode == VC_OFF) && type != KT_SPEC && type != KT_SHIFT) + if ((raw_mode || kbd_is_muted()) && type != KT_SPEC && type != KT_SHIFT) return; (*k_handler[type])(vc, keysym & 0xff, !down); @@ -1742,6 +1747,30 @@ int vt_do_kdskbmode(int console, unsigned int arg) } /** + * vt_do_kdskbmute - set keyboard event mute + * @console: the console to use + * @arg: the requested mode + * + * Update the keyboard mute state while holding the correct locks. + * Return 0 for success or an error code. + */ +int vt_do_kdskbmute(int console, unsigned int arg) +{ + struct kbd_struct * kbd = kbd_table + console; + int ret = 0; + unsigned long flags; + + spin_lock_irqsave(&kbd_event_lock, flags); + if (arg) + set_vc_kbd_mode(kbd, VC_MUTE); + else + clr_vc_kbd_mode(kbd, VC_MUTE); + spin_unlock_irqrestore(&kbd_event_lock, flags); + return ret; +} + + +/** * vt_do_kdskbmeta - set keyboard meta state * @console: the console to use * @arg: the requested meta state @@ -2068,13 +2097,18 @@ int vt_do_kdgkbmode(int console) return K_MEDIUMRAW; case VC_UNICODE: return K_UNICODE; - case VC_OFF: - return K_OFF; default: return K_XLATE; } } +int vt_do_kdgkbmute(int console) +{ + struct kbd_struct * kbd = kbd_table + console; + /* This is a spot read so needs no locking */ + return vc_kbd_mode(kbd, VC_MUTE); +} + /** * vt_do_kdgkbmeta - report meta status * @console: console to report diff --git a/drivers/tty/vt/vt_ioctl.c b/drivers/tty/vt/vt_ioctl.c index b841f56..f0951e2 100644 --- a/drivers/tty/vt/vt_ioctl.c +++ b/drivers/tty/vt/vt_ioctl.c @@ -477,6 +477,19 @@ int vt_ioctl(struct tty_struct *tty, ret = put_user(uival, (int __user *)arg); break; + case KDSKBMUTE: + if (!perm) + return -EPERM; + ret = vt_do_kdskbmute(console, arg); + if (ret == 0) + tty_ldisc_flush(tty); + break; + + case KDGKBMUTE: + uival = vt_do_kdgkbmute(console); + ret = put_user(uival, (int __user *)arg); + break; + /* this could be folded into KDSKBMODE, but for compatibility reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */ case KDSKBMETA: diff --git a/include/linux/kbd_kern.h b/include/linux/kbd_kern.h index b7c8cdc..18c0a45 100644 --- a/include/linux/kbd_kern.h +++ b/include/linux/kbd_kern.h @@ -55,12 +55,13 @@ struct kbd_struct { #define VC_UNICODE 3 /* Unicode mode */ #define VC_OFF 4 /* disabled mode */ - unsigned char modeflags:5; + unsigned char modeflags:6; #define VC_APPLIC 0 /* application key mode */ #define VC_CKMODE 1 /* cursor key mode */ #define VC_REPEAT 2 /* keyboard repeat */ #define VC_CRLF 3 /* 0 - enter sends CR, 1 - enter sends CRLF */ #define VC_META 4 /* 0 - meta, 1 - meta=prefix with ESC */ +#define VC_MUTE 5 /* don't generate events */ }; extern int kbd_init(void); diff --git a/include/linux/vt_kern.h b/include/linux/vt_kern.h index 50ae7d0..a886915 100644 --- a/include/linux/vt_kern.h +++ b/include/linux/vt_kern.h @@ -168,6 +168,7 @@ extern void hide_boot_cursor(bool hide); /* keyboard provided interfaces */ extern int vt_do_diacrit(unsigned int cmd, void __user *up, int eperm); +extern int vt_do_kdskbmute(int console, unsigned int arg); extern int vt_do_kdskbmode(int console, unsigned int arg); extern int vt_do_kdskbmeta(int console, unsigned int arg); extern int vt_do_kbkeycode_ioctl(int cmd, struct kbkeycode __user *user_kbkc, @@ -177,6 +178,7 @@ extern int vt_do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe, extern int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm); extern int vt_do_kdskled(int console, int cmd, unsigned long arg, int perm); +extern int vt_do_kdgkbmute(int console); extern int vt_do_kdgkbmode(int console); extern int vt_do_kdgkbmeta(int console); extern void vt_reset_unicode(int console); diff --git a/include/uapi/linux/kd.h b/include/uapi/linux/kd.h index 87b7cc4..ce08f6a 100644 --- a/include/uapi/linux/kd.h +++ b/include/uapi/linux/kd.h @@ -150,6 +150,10 @@ struct kbd_repeat { /* earlier this field was misnamed "rate" */ }; +/* get/set event mute */ +#define KDGKBMUTE 0x4B50 +#define KDSKBMUTE 0x4B51 + #define KDKBDREP 0x4B52 /* set keyboard delay/repeat rate; * actually used values are returned */ -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
