usr/src/lib/libbc/libc/gen/common/ftok.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 AT&T */
  23 /*        All Rights Reserved   */
  24
  25 #pragma ident   "%Z%%M% %I%     %E% SMI"  /* from S5R2 1.2 */
  26
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29 #include <sys/sysmacros.h>
  30
  31 key_t
  32 ftok(path, id)
  33 char *path;
  34 char id;
  35 {
  36         struct stat st;
  37
  38         return(stat(path, &st) < 0 ? (key_t)-1 :
  39             (key_t)((key_t)id << 24 | ((long)(unsigned)minor(st.st_dev)) << 16 |
  40                 (unsigned)st.st_ino));
  41 }