ftok.c 1.3 KB

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  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. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Library General Public License as
  6. published by the Free Software Foundation; either version 2 of the
  7. License, or (at your option) any later version.
  8. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Library General Public License for more details.
  12. You should have received a copy of the GNU Library General Public
  13. License along with the GNU C Library; see the file COPYING.LIB. If not,
  14. write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  15. Boston, MA 02111-1307, USA. */
  16. #include <sys/ipc.h>
  17. #include <sys/stat.h>
  18. key_t
  19. ftok (pathname, proj_id)
  20. const char *pathname;
  21. int proj_id;
  22. {
  23. struct stat st;
  24. key_t key;
  25. if (_xstat (_STAT_VER, pathname, &st) < 0)
  26. return (key_t) -1;
  27. key = ((st.st_ino & 0xffff) | ((st.st_dev & 0xff) << 16)
  28. | ((proj_id & 0xff) << 24));
  29. return key;
  30. }