usr/src/cmd/vt/vtinfo.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #include <sys/types.h>
  27 #include <sys/stat.h>
  28 #include <fcntl.h>
  29 #include <unistd.h>
  30 #include <stropts.h>
  31 #include <sys/vt.h>
  32
  33 /*
  34  * return value:
  35  *  0: disabled
  36  *  1: enabled
  37  *  2: An error occured
  38  */
  39 int
  40 main(void)
  41 {
  42         int result;
  43         int fd;
  44
  45         if ((fd = open("/dev/vt/0", O_RDONLY)) < 0)
  46                 return (2);
  47
  48         if (ioctl(fd, VT_ENABLED, &result) != 0) {
  49                 (void) close(fd);
  50                 return (2);
  51         }
  52
  53         (void) close(fd);
  54
  55         if (result == 0)
  56                 return (0);     /* disabled */
  57
  58         return (1);             /* enabled */
  59 }