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/* cons-switch.c - Switch to another virtual console.
Copyright (C) 2002 Free Software Foundation, Inc.
Written by Marcus Brinkmann.
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
The GNU Hurd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include <errno.h>
#include <error.h>
#include <assert.h>
#include "cons.h"
/* Switch the active console in CONS to ID or the current one plus
DELTA. This will call back into the user code by doing a
cons_vcons_activate. */
error_t
cons_switch (cons_t cons, int id, int delta)
{
vcons_t vcons = NULL;
vcons_t active;
if (!id && !delta)
return 0;
mutex_lock (&cons->lock);
active = cons->active;
if (!id && !active)
{
mutex_unlock (&cons->lock);
return EINVAL;
}
if (id)
{
vcons = cons->vcons_list;
while (vcons && vcons->id != id)
vcons = vcons->next;
}
else if (delta > 0)
{
vcons = cons->active;
while (delta-- > 0)
{
vcons = vcons->next;
if (!vcons)
vcons = cons->vcons_list;
}
}
else
{
assert (delta < 0);
while (delta++ < 0)
{
vcons = vcons->prev;
if (!vcons)
vcons = cons->vcons_last;
}
}
if (!vcons)
{
mutex_unlock (&cons->lock);
return ESRCH;
}
if (vcons != active)
{
error_t err = cons_vcons_activate (vcons);
if (err)
{
mutex_unlock (&cons->lock);
return err;
}
cons->active = vcons;
cons_vcons_refresh (vcons);
}
mutex_unlock (&cons->lock);
return 0;
}
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