1/* Copyright (C) 1995-2021 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 Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the 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 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <sys/ipc.h>
20#include <sys/stat.h>
21
22key_t
23ftok (const char *pathname, int proj_id)
24{
25 struct __stat64_t64 st;
26 key_t key;
27
28 if (__stat64_time64 (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