aio_abi.h 2.6 KB

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  1. /* include/linux/aio_abi.h
  2. *
  3. * Copyright 2000,2001,2002 Red Hat.
  4. *
  5. * Written by Benjamin LaHaise <bcrl@kvack.org>
  6. *
  7. * Distribute under the terms of the GPLv2 (see ../../COPYING) or under
  8. * the following terms.
  9. *
  10. * Permission to use, copy, modify, and distribute this software and its
  11. * documentation is hereby granted, provided that the above copyright
  12. * notice appears in all copies. This software is provided without any
  13. * warranty, express or implied. Red Hat makes no representations about
  14. * the suitability of this software for any purpose.
  15. *
  16. * IN NO EVENT SHALL RED HAT BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
  17. * SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF
  18. * THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF RED HAT HAS BEEN ADVISED
  19. * OF THE POSSIBILITY OF SUCH DAMAGE.
  20. *
  21. * RED HAT DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23. * PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND
  24. * RED HAT HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
  25. * ENHANCEMENTS, OR MODIFICATIONS.
  26. */
  27. #ifndef __LINUX__AIO_ABI_H
  28. #define __LINUX__AIO_ABI_H
  29. #include <asm/byteorder.h>
  30. typedef unsigned long aio_context_t;
  31. enum {
  32. IOCB_CMD_PREAD = 0,
  33. IOCB_CMD_PWRITE = 1,
  34. IOCB_CMD_FSYNC = 2,
  35. IOCB_CMD_FDSYNC = 3,
  36. /* These two are experimental.
  37. * IOCB_CMD_PREADX = 4,
  38. * IOCB_CMD_POLL = 5,
  39. */
  40. IOCB_CMD_NOOP = 6,
  41. IOCB_CMD_PREADV = 7,
  42. IOCB_CMD_PWRITEV = 8,
  43. };
  44. /* read() from /dev/aio returns these structures. */
  45. struct io_event {
  46. __u64 data; /* the data field from the iocb */
  47. __u64 obj; /* what iocb this event came from */
  48. __s64 res; /* result code for this event */
  49. __s64 res2; /* secondary result */
  50. };
  51. #if defined(__LITTLE_ENDIAN)
  52. #define PADDED(x,y) x, y
  53. #elif defined(__BIG_ENDIAN)
  54. #define PADDED(x,y) y, x
  55. #else
  56. #error edit for your odd byteorder.
  57. #endif
  58. /*
  59. * we always use a 64bit off_t when communicating
  60. * with userland. its up to libraries to do the
  61. * proper padding and aio_error abstraction
  62. */
  63. struct iocb {
  64. /* these are internal to the kernel/libc. */
  65. __u64 aio_data; /* data to be returned in event's data */
  66. __u32 PADDED(aio_key, aio_reserved1);
  67. /* the kernel sets aio_key to the req # */
  68. /* common fields */
  69. __u16 aio_lio_opcode; /* see IOCB_CMD_ above */
  70. __s16 aio_reqprio;
  71. __u32 aio_fildes;
  72. __u64 aio_buf;
  73. __u64 aio_nbytes;
  74. __s64 aio_offset;
  75. /* extra parameters */
  76. __u64 aio_reserved2; /* TODO: use this for a (struct sigevent *) */
  77. __u64 aio_reserved3;
  78. }; /* 64 bytes */
  79. #undef IFBIG
  80. #undef IFLITTLE
  81. #endif /* __LINUX__AIO_ABI_H */