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/*
* Copyright (C) 2010-2011 Robert Ancell.
* Author: Robert Ancell <robert.ancell@canonical.com>
*
* This program 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 3 of the License, or (at your option) any later
* version. See http://www.gnu.org/copyleft/gpl.html the full text of the
* license.
*/
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <glib/gstdio.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#ifdef __linux__
#include <linux/vt.h>
#endif
#include "vt.h"
#include "configuration.h"
static GList *used_vts = NULL;
static gint
open_console (void)
{
int fd;
if (getuid () != 0)
return -1;
fd = g_open ("/dev/console", O_RDONLY | O_NOCTTY);
if (fd < 0)
g_warning ("Error opening /dev/console: %s", strerror (errno));
return fd;
}
gint
vt_get_active (void)
{
#ifdef __linux__
gint console_fd;
gint active = -1;
console_fd = open_console ();
if (console_fd >= 0)
{
struct vt_stat console_state = { 0 };
if (ioctl (console_fd, VT_GETSTATE, &console_state) < 0)
g_warning ("Error using VT_GETSTATE on /dev/console: %s", strerror (errno));
else
active = console_state.v_active;
close (console_fd);
}
return active;
#else
return -1;
#endif
}
void
vt_set_active (gint number)
{
#ifdef __linux__
gint console_fd;
g_debug ("Activating VT %d", number);
console_fd = open_console ();
if (console_fd >= 0)
{
int n = number;
if (ioctl (console_fd, VT_ACTIVATE, n) < 0)
g_warning ("Error using VT_ACTIVATE %d on /dev/console: %s", n, strerror (errno));
close (console_fd);
}
#endif
}
static gboolean
vt_is_used (gint number)
{
GList *link;
for (link = used_vts; link; link = link->next)
{
int n = GPOINTER_TO_INT (link->data);
if (n == number)
return TRUE;
}
return FALSE;
}
gint
vt_get_min (void)
{
gint number;
number = config_get_integer (config_get_instance (), "LightDM", "minimum-vt");
if (number < 1)
number = 1;
return number;
}
gint
vt_get_unused (void)
{
gint number;
number = vt_get_min ();
while (vt_is_used (number))
number++;
used_vts = g_list_append (used_vts, GINT_TO_POINTER (number));
return number;
}
void
vt_release (gint number)
{
used_vts = g_list_remove (used_vts, GINT_TO_POINTER (link));
}
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