mmap64.c 2.7 KB

12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788
  1. /* Copyright (C) 1997, 1998, 1999, 2002 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. Contributed by Daniel Jacobowitz <dan@debian.org>, 1999.
  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. /* Massivly hacked up for uClibc by Erik Andersen */
  17. #define mmap __mmap
  18. #include <features.h>
  19. #include <errno.h>
  20. #include <unistd.h>
  21. #include <sys/mman.h>
  22. #if defined __UCLIBC_HAS_LFS__
  23. #if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS != 64
  24. #undef _FILE_OFFSET_BITS
  25. #define _FILE_OFFSET_BITS 64
  26. #endif
  27. #ifndef __USE_LARGEFILE64
  28. # define __USE_LARGEFILE64 1
  29. #endif
  30. /* We absolutely do _NOT_ want interfaces silently
  31. * * renamed under us or very bad things will happen... */
  32. #ifdef __USE_FILE_OFFSET64
  33. # undef __USE_FILE_OFFSET64
  34. #endif
  35. #if ! defined __NR_mmap2 || ! defined _syscall6
  36. /*
  37. * This version is a stub that just chops off everything at the mmap 32 bit
  38. * mmap() address space... You will probably need to add in an arch specific
  39. * implementation to override this as there is not a generic way for me to
  40. * implement this particular syscall if your arch lacks _syscall6...
  41. *
  42. */
  43. __ptr_t mmap64(__ptr_t addr, size_t len, int prot, int flags, int fd, __off64_t offset)
  44. {
  45. if (offset != (off_t) offset || (offset + len) != (off_t) (offset + len))
  46. {
  47. __set_errno (EINVAL);
  48. return MAP_FAILED;
  49. }
  50. return mmap (addr, len, prot, flags, fd, (off_t) offset);
  51. }
  52. #else
  53. #define __NR___syscall_mmap2 __NR_mmap2
  54. static inline _syscall6(__ptr_t, __syscall_mmap2, __ptr_t, addr,
  55. size_t, len, int, prot, int, flags, int, fd, off_t, offset);
  56. /* This is always 12, even on architectures where PAGE_SHIFT != 12. */
  57. # ifndef MMAP2_PAGE_SHIFT
  58. # define MMAP2_PAGE_SHIFT 12
  59. # endif
  60. __ptr_t mmap64(__ptr_t addr, size_t len, int prot, int flags, int fd, __off64_t offset)
  61. {
  62. if (offset & ((1 << MMAP2_PAGE_SHIFT) - 1)) {
  63. __set_errno (EINVAL);
  64. return MAP_FAILED;
  65. }
  66. return(__syscall_mmap2(addr, len, prot, flags, fd, (off_t) (offset >> MMAP2_PAGE_SHIFT)));
  67. }
  68. #endif
  69. #endif /* __UCLIBC_HAS_LFS__ */