1 /* Copyright (C) 1995, 1996 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
14
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 see <http://www.gnu.org/licenses/>. */
18
19 #include <sys/ipc.h>
20 #include <sys/stat.h>
21 #include <_lfs_64.h>
22
ftok(const char * pathname,int proj_id)23 key_t ftok (const char *pathname, int proj_id)
24 {
25 struct stat64 st;
26 key_t key;
27
28 if (stat64(pathname, &st) < 0)
29 return (key_t) -1;
30
31 key = ((st.st_ino & 0xffff) | ((st.st_dev & 0xff) << 16)
32 | ((proj_id & 0xff) << 24));
33
34 return key;
35 }
36