[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <1253396244-7885-43-git-send-email-gregkh@suse.de>
Date: Sat, 19 Sep 2009 14:36:48 -0700
From: Greg Kroah-Hartman <gregkh@...e.de>
To: linux-kernel@...r.kernel.org
Cc: Alan Cox <alan@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 43/79] vt: add an activate and lock
From: Alan Cox <alan@...ux.intel.com>
X and other graphical interfaces need to be able to flip to a console
and lock it into graphics mode without races.
Signed-off-by: Alan Cox <alan@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
drivers/char/vt_ioctl.c | 38 +++++++++++++++++++++++++++++++++++++-
include/linux/vt.h | 7 +++++++
2 files changed, 44 insertions(+), 1 deletions(-)
diff --git a/drivers/char/vt_ioctl.c b/drivers/char/vt_ioctl.c
index d29fbd4..0fceb8f 100644
--- a/drivers/char/vt_ioctl.c
+++ b/drivers/char/vt_ioctl.c
@@ -972,6 +972,41 @@ int vt_ioctl(struct tty_struct *tty, struct file * file,
}
break;
+ case VT_SETACTIVATE:
+ {
+ struct vt_setactivate vsa;
+
+ if (!perm)
+ goto eperm;
+
+ if (copy_from_user(&vsa, (struct vt_setactivate __user *)arg,
+ sizeof(struct vt_setactivate)))
+ return -EFAULT;
+ if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES)
+ ret = -ENXIO;
+ else {
+ vsa.console--;
+ acquire_console_sem();
+ ret = vc_allocate(vsa.console);
+ if (ret == 0) {
+ struct vc_data *nvc;
+ /* This is safe providing we don't drop the
+ console sem between vc_allocate and
+ finishing referencing nvc */
+ nvc = vc_cons[vsa.console].d;
+ nvc->vt_mode = vsa.mode;
+ nvc->vt_mode.frsig = 0;
+ put_pid(nvc->vt_pid);
+ nvc->vt_pid = get_pid(task_pid(current));
+ }
+ release_console_sem();
+ if (ret)
+ break;
+ /* Commence switch and lock */
+ set_console(arg);
+ }
+ }
+
/*
* wait until the specified VT has been activated
*/
@@ -1342,7 +1377,8 @@ void vc_SAK(struct work_struct *work)
}
/*
- * Performs the back end of a vt switch
+ * Performs the back end of a vt switch. Called under the console
+ * semaphore.
*/
static void complete_change_console(struct vc_data *vc)
{
diff --git a/include/linux/vt.h b/include/linux/vt.h
index 831daf6..7afca0d 100644
--- a/include/linux/vt.h
+++ b/include/linux/vt.h
@@ -77,4 +77,11 @@ struct vt_event {
#define VT_WAITEVENT 0x560E /* Wait for an event */
+struct vt_setactivate {
+ unsigned int console;
+ struct vt_mode mode;
+};
+
+#define VT_SETACTIVATE 0x560F /* Activate and set the mode of a console */
+
#endif /* _LINUX_VT_H */
--
1.6.4.2
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists