mmap.c 1.8 KB

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  1. /* Copyright (C) 1997, 1998, 1999, 2002, 2003 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. /* Extracted from ../common/mmap64.c by Alexandre Oliva <aoliva@redhat.com>
  18. We don't want to use the old mmap interface. */
  19. #include <features.h>
  20. #include <errno.h>
  21. #include <unistd.h>
  22. #include <sys/syscall.h>
  23. #include <sys/mman.h>
  24. libc_hidden_proto(mmap)
  25. #define __NR___syscall_mmap2 __NR_mmap2
  26. static __inline__ _syscall6(__ptr_t, __syscall_mmap2, __ptr_t, addr,
  27. size_t, len, int, prot, int, flags, int, fd, off_t, offset)
  28. /* This is always 12, even on architectures where PAGE_SHIFT != 12. */
  29. # ifndef MMAP2_PAGE_SHIFT
  30. # define MMAP2_PAGE_SHIFT 12
  31. # endif
  32. __ptr_t mmap(__ptr_t addr, size_t len, int prot, int flags, int fd, __off_t offset)
  33. {
  34. if (offset & ((1 << MMAP2_PAGE_SHIFT) - 1)) {
  35. __set_errno (EINVAL);
  36. return MAP_FAILED;
  37. }
  38. return(__syscall_mmap2(addr, len, prot, flags, fd, (off_t) (offset >> MMAP2_PAGE_SHIFT)));
  39. }
  40. libc_hidden_def(mmap)