src/system/libroot/posix/sys/ftok.c

   1 /*
   2  * Copyright 2008, Haiku Inc. All rights reserved.
   3  * Distributed under the terms of the MIT License.
   4  *
   5  * Authors:
   6  *              Salvatore Benedetto <salvatore.benedetto@gmail.com>
   7  */
   8
   9 #include <sys/ipc.h>
  10 #include <sys/stat.h>
  11
  12
  13 key_t
  14 ftok(const char *path, int id)
  15 {
  16         struct stat st;
  17
  18         if (stat(path, &st) < 0)
  19                 return (key_t)-1;
  20
  21         return (key_t)(id << 24 | (st.st_dev & 0xff) << 16 | (st.st_ino & 0xffff));
  22 }