LCOV - code coverage report
Current view: top level - lkbce/include/linux - aio_abi.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 2 2 100.0 %
Date: 2017-01-25 Functions: 0 0 -

          Line data    Source code
       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             : 
      30             : #include <linux/types.h>
      31             : #include <asm/byteorder.h>
      32             : 
      33             : typedef unsigned long   aio_context_t;
      34             : 
      35             : enum {
      36             :         IOCB_CMD_PREAD = 0,
      37             :         IOCB_CMD_PWRITE = 1,
      38             :         IOCB_CMD_FSYNC = 2,
      39             :         IOCB_CMD_FDSYNC = 3,
      40             :         /* These two are experimental.
      41             :          * IOCB_CMD_PREADX = 4,
      42             :          * IOCB_CMD_POLL = 5,
      43             :          */
      44           1 :         IOCB_CMD_NOOP = 6,
      45             :         IOCB_CMD_PREADV = 7,
      46             :         IOCB_CMD_PWRITEV = 8,
      47             : };
      48             : 
      49             : /*
      50             :  * Valid flags for the "aio_flags" member of the "struct iocb".
      51             :  *
      52             :  * IOCB_FLAG_RESFD - Set if the "aio_resfd" member of the "struct iocb"
      53             :  *                   is valid.
      54             :  */
      55             : #define IOCB_FLAG_RESFD         (1 << 0)
      56             : 
      57             : /* read() from /dev/aio returns these structures. */
      58             : struct io_event {
      59             :         __u64           data;           /* the data field from the iocb */
      60             :         __u64           obj;            /* what iocb this event came from */
      61             :         __s64           res;            /* result code for this event */
      62             :         __s64           res2;           /* secondary result */
      63             : };
      64             : 
      65             : #if defined(__LITTLE_ENDIAN)
      66             : #define PADDED(x,y)     x, y
      67             : #elif defined(__BIG_ENDIAN)
      68             : #define PADDED(x,y)     y, x
      69             : #else
      70             : #error edit for your odd byteorder.
      71             : #endif
      72             : 
      73             : /*
      74             :  * we always use a 64bit off_t when communicating
      75             :  * with userland.  its up to libraries to do the
      76             :  * proper padding and aio_error abstraction
      77             :  */
      78             : 
      79             : struct iocb {
      80             :         /* these are internal to the kernel/libc. */
      81             :         __u64   aio_data;       /* data to be returned in event's data */
      82             :         __u32   PADDED(aio_key, aio_reserved1);
      83             :                                 /* the kernel sets aio_key to the req # */
      84             : 
      85             :         /* common fields */
      86             :         __u16   aio_lio_opcode; /* see IOCB_CMD_ above */
      87             :         __s16   aio_reqprio;
      88             :         __u32   aio_fildes;
      89             : 
      90             :         __u64   aio_buf;
      91             :         __u64   aio_nbytes;
      92             :         __s64   aio_offset;
      93             : 
      94             :         /* extra parameters */
      95             :         __u64   aio_reserved2;  /* TODO: use this for a (struct sigevent *) */
      96             : 
      97             :         /* flags for the "struct iocb" */
      98             :         __u32   aio_flags;
      99             : 
     100             :         /*
     101             :          * if the IOCB_FLAG_RESFD flag of "aio_flags" is set, this is an
     102             :          * eventfd to signal AIO readiness to
     103             :          */
     104             :         __u32   aio_resfd;
     105             : }; /* 64 bytes */
     106           1 : 
     107             : #undef IFBIG
     108             : #undef IFLITTLE
     109             : 
     110             : #endif /* __LINUX__AIO_ABI_H */
     111             : 

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