usr/src/cmd/bnu/dkminor.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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  23 /*        All Rights Reserved   */
  24
  25
  26 #ident  "%Z%%M% %I%     %E% SMI"
  27
  28 #ifndef DIAL
  29         static char     SCCSID[] = "@(#)dkminor.c       2.3+BNU DKHOST 86/12/02";
  30 #endif
  31 /*
  32  *      COMMKIT(TM) Software - Datakit(R) VCS Interface Release 2.0 V1
  33  */
  34 /*
  35    Return minor device number for a given Datakit device.
  36    The channel number is used since using the minor device returned
  37    by fstat gives wrong results for duplex systems.
  38 */
  39
  40 #include "dk.h"
  41 GLOBAL
  42 dkminor(fd)
  43 {
  44         struct diocreq iocb;
  45
  46
  47         if (ioctl(fd, DIOCINFO, &iocb) < 0)
  48                 return(-1);
  49         return(iocb.req_chmin); /* req_chmin contains channel number */
  50 }