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authorAlan Cox <alan@linux.intel.com>2009-09-20 00:13:26 +0400
committerLive-CD User <linux@linux.site>2009-09-20 00:13:26 +0400
commitd3b5cffcf84a8bdc7073dce4745d67c72629af85 (patch)
treedfcaa9dbc59b3f17160624803f54711db1d9786f /drivers
parenta5eb56242d1e2d82938a066219ac1cdf0d68adc8 (diff)
downloadlinux-d3b5cffcf84a8bdc7073dce4745d67c72629af85.tar.xz
vt: add an activate and lock
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@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/char/vt_ioctl.c38
1 files changed, 37 insertions, 1 deletions
diff --git a/drivers/char/vt_ioctl.c b/drivers/char/vt_ioctl.c
index d29fbd44bdca..0fceb8f4d6f2 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)
{