usr/src/cmd/lp/lib/msgs/mopen.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 /*      Copyright (c) 1988 AT&T */
  27 /*        All Rights Reserved   */
  28
  29
  30 #ident  "%Z%%M% %I%     %E% SMI"        /* SVr4.0 1.5   */
  31 /* LINTLIBRARY */
  32
  33 # include       <errno.h>
  34
  35 # include       "lp.h"
  36 # include       "msgs.h"
  37
  38
  39 MESG    *lp_Md = 0;
  40
  41 /*
  42 ** mopen() - OPEN A MESSAGE PATH
  43 */
  44
  45 int
  46 mopen ()
  47 {
  48     if (lp_Md != NULL)
  49     {
  50         errno = EEXIST;
  51         return (-1);
  52     }
  53
  54     if ((lp_Md = mconnect(Lp_FIFO, 0, 0)) == NULL)
  55         return(-1);
  56
  57     return(0);
  58 }