The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/aio.h

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    1 /*-
    2  * Copyright (c) 1997 John S. Dyson.  All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. John S. Dyson's name may not be used to endorse or promote products
   10  *    derived from this software without specific prior written permission.
   11  *
   12  * DISCLAIMER:  This code isn't warranted to do anything useful.  Anything
   13  * bad that happens because of using this software isn't the responsibility
   14  * of the author.  This software is distributed AS-IS.
   15  *
   16  * $FreeBSD: releng/9.0/sys/sys/aio.h 189822 2009-03-14 19:17:00Z das $
   17  */
   18 
   19 #ifndef _SYS_AIO_H_
   20 #define _SYS_AIO_H_
   21 
   22 #include <sys/types.h>
   23 #include <sys/signal.h>
   24 
   25 /*
   26  * Returned by aio_cancel:
   27  */
   28 #define AIO_CANCELED            0x1
   29 #define AIO_NOTCANCELED         0x2
   30 #define AIO_ALLDONE             0x3
   31 
   32 /*
   33  * LIO opcodes
   34  */
   35 #define LIO_NOP                 0x0
   36 #define LIO_WRITE               0x1
   37 #define LIO_READ                0x2
   38 #ifdef _KERNEL
   39 #define LIO_SYNC                0x3
   40 #endif
   41 
   42 /*
   43  * LIO modes
   44  */
   45 #define LIO_NOWAIT              0x0
   46 #define LIO_WAIT                0x1
   47 
   48 /*
   49  * Maximum number of allowed LIO operations
   50  */
   51 #define AIO_LISTIO_MAX          16
   52 
   53 /*
   54  * Private members for aiocb -- don't access
   55  * directly.
   56  */
   57 struct __aiocb_private {
   58         long    status;
   59         long    error;
   60         void    *kernelinfo;
   61 };
   62 
   63 /*
   64  * I/O control block
   65  */
   66 typedef struct aiocb {
   67         int     aio_fildes;             /* File descriptor */
   68         off_t   aio_offset;             /* File offset for I/O */
   69         volatile void *aio_buf;         /* I/O buffer in process space */
   70         size_t  aio_nbytes;             /* Number of bytes for I/O */
   71         int     __spare__[2];
   72         void    *__spare2__;
   73         int     aio_lio_opcode;         /* LIO opcode */
   74         int     aio_reqprio;            /* Request priority -- ignored */
   75         struct  __aiocb_private _aiocb_private;
   76         struct  sigevent aio_sigevent;  /* Signal to deliver */
   77 } aiocb_t;
   78 
   79 #ifndef _KERNEL
   80 
   81 struct timespec;
   82 
   83 __BEGIN_DECLS
   84 /*
   85  * Asynchronously read from a file
   86  */
   87 int     aio_read(struct aiocb *);
   88 
   89 /*
   90  * Asynchronously write to file
   91  */
   92 int     aio_write(struct aiocb *);
   93 
   94 /*
   95  * List I/O Asynchronously/synchronously read/write to/from file
   96  *      "lio_mode" specifies whether or not the I/O is synchronous.
   97  *      "acb_list" is an array of "nacb_listent" I/O control blocks.
   98  *      when all I/Os are complete, the optional signal "sig" is sent.
   99  */
  100 int     lio_listio(int, struct aiocb * const [], int, struct sigevent *);
  101 
  102 /*
  103  * Get completion status
  104  *      returns EINPROGRESS until I/O is complete.
  105  *      this routine does not block.
  106  */
  107 int     aio_error(const struct aiocb *);
  108 
  109 /*
  110  * Finish up I/O, releasing I/O resources and returns the value
  111  *      that would have been associated with a synchronous I/O request.
  112  *      This routine must be called once and only once for each
  113  *      I/O control block who has had I/O associated with it.
  114  */
  115 ssize_t aio_return(struct aiocb *);
  116 
  117 /*
  118  * Cancel I/O
  119  */
  120 int     aio_cancel(int, struct aiocb *);
  121 
  122 /*
  123  * Suspend until all specified I/O or timeout is complete.
  124  */
  125 int     aio_suspend(const struct aiocb * const[], int, const struct timespec *);
  126 
  127 #ifdef __BSD_VISIBLE
  128 int     aio_waitcomplete(struct aiocb **, struct timespec *);
  129 #endif
  130 
  131 int     aio_fsync(int op, struct aiocb *aiocbp);
  132 __END_DECLS
  133 
  134 #else
  135 
  136 /* Forward declarations for prototypes below. */
  137 struct socket;
  138 struct sockbuf;
  139 
  140 extern void (*aio_swake)(struct socket *, struct sockbuf *);
  141 
  142 #endif
  143 
  144 #endif

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