llseek.c 2.1 KB

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  1. /* vi: set sw=4 ts=4: */
  2. /*
  3. * llseek/lseek64 syscall for uClibc
  4. *
  5. * Copyright (C) 2002 by Erik Andersen <andersen@codpoet.org>
  6. *
  7. * This program is free software; you can redistribute it and/or modify it
  8. * under the terms of the GNU Library General Public License as published by
  9. * the Free Software Foundation; either version 2 of the License, or (at your
  10. * option) any later version.
  11. *
  12. * This program is distributed in the hope that it will be useful, but WITHOUT
  13. * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14. * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
  15. * for more details.
  16. *
  17. * You should have received a copy of the GNU Library General Public License
  18. * along with this program; if not, write to the Free Software Foundation,
  19. * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20. *
  21. */
  22. #define _GNU_SOURCE
  23. #define _LARGEFILE64_SOURCE
  24. #include <features.h>
  25. #undef __OPTIMIZE__
  26. /* We absolutely do _NOT_ want interfaces silently
  27. * * * renamed under us or very bad things will happen... */
  28. #ifdef __USE_FILE_OFFSET64
  29. # undef __USE_FILE_OFFSET64
  30. #endif
  31. #include <errno.h>
  32. #include <sys/types.h>
  33. #include <sys/syscall.h>
  34. #if defined __NR__llseek && defined __UCLIBC_HAVE_LFS__
  35. #ifndef INLINE_SYSCALL
  36. #define INLINE_SYSCALL(name, nr, args...) __syscall_llseek (args)
  37. #define __NR___syscall_llseek __NR__llseek
  38. static inline _syscall5(int, __syscall_llseek, int, fd, off_t, offset_hi,
  39. off_t, offset_lo, loff_t *, result, int, whence);
  40. #endif
  41. loff_t __libc_lseek64(int fd, loff_t offset, int whence)
  42. {
  43. loff_t result;
  44. return(loff_t)(INLINE_SYSCALL (_llseek, 5, fd, (off_t) (offset >> 32),
  45. (off_t) (offset & 0xffffffff), &result, whence) ?: result);
  46. }
  47. weak_alias(__libc_lseek64, llseek);
  48. weak_alias(__libc_lseek64, lseek64);
  49. #else
  50. extern __off_t __libc_lseek(int fildes, off_t offset, int whence);
  51. loff_t __libc_lseek64(int fd, loff_t offset, int whence)
  52. {
  53. return(loff_t)(__libc_lseek(fd, (off_t) (offset & 0xffffffff), whence));
  54. }
  55. weak_alias(__libc_lseek, llseek)
  56. weak_alias(__libc_lseek, lseek64)
  57. #endif