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[glibc.git] / sysvipc / ftok.c
blob82786b590f38a89d1306f4ab8411426c6897d488
1 /* Copyright (C) 1995, 1996, 2000 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.
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.
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.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #include <sys/ipc.h>
21 #include <sys/stat.h>
23 key_t
24 ftok (pathname, proj_id)
25 const char *pathname;
26 int proj_id;
28 struct stat64 st;
29 key_t key;
31 if (__xstat64 (_STAT_VER, pathname, &st) < 0)
32 return (key_t) -1;
34 key = ((st.st_ino & 0xffff) | ((st.st_dev & 0xff) << 16)
35 | ((proj_id & 0xff) << 24));
37 return key;