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sysmacros.h 1.8 KB

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  1. /* Definitions of macros to access `dev_t' values.
  2. Copyright (C) 1996, 1997, 1999, 2003, 2004 Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Lesser General Public
  6. License as published by the Free Software Foundation; either
  7. version 2.1 of the 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. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with the GNU C Library; if not, write to the Free
  14. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA. */
  16. #ifndef __SYS_SYSMACROS_H
  17. #define __SYS_SYSMACROS_H 1
  18. static inline unsigned int
  19. __gnu_dev_major(unsigned long long int __dev)
  20. {
  21. return ((__dev >> 8) & 0xfff) | ((unsigned int) (__dev >> 32) & ~0xfff);
  22. }
  23. static inline unsigned int
  24. __gnu_dev_minor(unsigned long long int __dev)
  25. {
  26. return (__dev & 0xff) | ((unsigned int) (__dev >> 12) & ~0xff);
  27. }
  28. static inline unsigned long long int
  29. __gnu_dev_makedev(unsigned int __major, unsigned int __minor)
  30. {
  31. return ((__minor & 0xff) | ((__major & 0xfff) << 8)
  32. | (((unsigned long long int) (__minor & ~0xff)) << 12)
  33. | (((unsigned long long int) (__major & ~0xfff)) << 32));
  34. }
  35. /* Access the functions with their traditional names. */
  36. #ifndef major
  37. # define major(dev) __gnu_dev_major (dev)
  38. #endif
  39. #ifndef minor
  40. # define minor(dev) __gnu_dev_minor (dev)
  41. #endif
  42. #ifndef makedev
  43. # define makedev(maj, min) __gnu_dev_makedev (maj, min)
  44. #endif
  45. #endif /* sys/sysmacros.h */