posix_fadvise.c 1.4 KB

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  1. /* vi: set sw=4 ts=4: */
  2. /*
  3. * posix_fadvise() for uClibc
  4. * http://www.opengroup.org/onlinepubs/009695399/functions/posix_fadvise.html
  5. *
  6. * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
  7. *
  8. * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
  9. */
  10. /* need to hide the 64bit prototype or the strong_alias()
  11. * will fail when __NR_fadvise64_64 doesnt exist */
  12. #define posix_fadvise64 __hideposix_fadvise64
  13. #include <sys/syscall.h>
  14. #include <fcntl.h>
  15. #undef posix_fadvise64
  16. #ifdef __NR_fadvise64
  17. #define __NR_posix_fadvise __NR_fadvise64
  18. /* get rid of following conditional when
  19. all supported arches are having INTERNAL_SYSCALL defined
  20. */
  21. #ifdef INTERNAL_SYSCALL
  22. int posix_fadvise(int fd, off_t offset, off_t len, int advice)
  23. {
  24. INTERNAL_SYSCALL_DECL(err);
  25. int ret = (int) (INTERNAL_SYSCALL(posix_fadvise, err, 5, fd,
  26. __LONG_LONG_PAIR (offset >> 31, offset), len, advice));
  27. if (INTERNAL_SYSCALL_ERROR_P (ret, err))
  28. return INTERNAL_SYSCALL_ERRNO (ret, err);
  29. return 0;
  30. }
  31. #else
  32. _syscall4(int, posix_fadvise, int, fd, off_t, offset,
  33. off_t, len, int, advice);
  34. #endif
  35. #if defined __UCLIBC_HAS_LFS__ && (!defined __NR_fadvise64_64 || !defined _syscall6)
  36. extern __typeof(posix_fadvise) posix_fadvise64;
  37. strong_alias(posix_fadvise,posix_fadvise64)
  38. #endif
  39. #else
  40. int posix_fadvise(int fd attribute_unused, off_t offset attribute_unused, off_t len attribute_unused, int advice attribute_unused)
  41. {
  42. return ENOSYS;
  43. }
  44. #endif