Messages in this thread | | | Date | Mon, 27 Mar 2006 11:18:31 +0200 | From | Pavel Machek <> | Subject | Re: [RFC][PATCH] vt: TIOCL to read kmsg_redirect from user space |
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Hi!
> The userland suspend tool we're working on needs to get the current value > of kmsg_redirect from the kernel so that it can save it and restore it after > resume. Unfortunetely there only is TIOCL_SETKMSGREDIRECT allowing us to > set this value from the user space. > > The appended patch adds the "missing" TIOCL_GETKMSGREDIRECT that we > need.
> Comments welcome.
Looks good to me. Pavel
> drivers/char/vt.c | 4 ++++ > include/linux/tiocl.h | 1 + > 2 files changed, 5 insertions(+) > > Index: linux-2.6.16-mm1/drivers/char/vt.c > =================================================================== > --- linux-2.6.16-mm1.orig/drivers/char/vt.c > +++ linux-2.6.16-mm1/drivers/char/vt.c > @@ -2328,6 +2328,10 @@ int tioclinux(struct tty_struct *tty, un > case TIOCL_SETVESABLANK: > set_vesa_blanking(p); > break; > + case TIOCL_GETKMSGREDIRECT: > + data = kmsg_redirect; > + ret = __put_user(data, p); > + break; > case TIOCL_SETKMSGREDIRECT: > if (!capable(CAP_SYS_ADMIN)) { > ret = -EPERM; > Index: linux-2.6.16-mm1/include/linux/tiocl.h > =================================================================== > --- linux-2.6.16-mm1.orig/include/linux/tiocl.h > +++ linux-2.6.16-mm1/include/linux/tiocl.h > @@ -34,5 +34,6 @@ struct tiocl_selection { > #define TIOCL_SCROLLCONSOLE 13 /* scroll console */ > #define TIOCL_BLANKSCREEN 14 /* keep screen blank even if a key is pressed */ > #define TIOCL_BLANKEDSCREEN 15 /* return which vt was blanked */ > +#define TIOCL_GETKMSGREDIRECT 17 /* get the vt the kernel messages are restricted to */ > > #endif /* _LINUX_TIOCL_H */
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