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/6.0/sys/sys/aio.h 139825 2005-01-07 02:29:27Z imp $
   17  */
   18 
   19 #ifndef _SYS_AIO_H_
   20 #define _SYS_AIO_H_
   21 
   22 #include <sys/time.h>
   23 #include <sys/types.h>
   24 #include <sys/signal.h>
   25 
   26 /*
   27  * Returned by aio_cancel:
   28  */
   29 #define AIO_CANCELED            0x1
   30 #define AIO_NOTCANCELED         0x2
   31 #define AIO_ALLDONE             0x3
   32 
   33 /*
   34  * LIO opcodes
   35  */
   36 #define LIO_NOP                 0x0
   37 #define LIO_WRITE               0x1
   38 #define LIO_READ                0x2
   39 
   40 /*
   41  * LIO modes
   42  */
   43 #define LIO_NOWAIT              0x0
   44 #define LIO_WAIT                0x1
   45 
   46 /*
   47  * Maximum number of allowed LIO operations
   48  */
   49 #define AIO_LISTIO_MAX          16
   50 
   51 /*
   52  * Private members for aiocb -- don't access
   53  * directly.
   54  */
   55 struct __aiocb_private {
   56         long    status;
   57         long    error;
   58         void    *kernelinfo;
   59 };
   60 
   61 /*
   62  * I/O control block
   63  */
   64 typedef struct aiocb {
   65         int     aio_fildes;             /* File descriptor */
   66         off_t   aio_offset;             /* File offset for I/O */
   67         volatile void *aio_buf;         /* I/O buffer in process space */
   68         size_t  aio_nbytes;             /* Number of bytes for I/O */
   69         struct  sigevent aio_sigevent;  /* Signal to deliver */
   70         int     aio_lio_opcode;         /* LIO opcode */
   71         int     aio_reqprio;            /* Request priority -- ignored */
   72         struct  __aiocb_private _aiocb_private;
   73 } aiocb_t;
   74 
   75 #ifndef _KERNEL
   76 
   77 __BEGIN_DECLS
   78 /*
   79  * Asynchronously read from a file
   80  */
   81 int     aio_read(struct aiocb *);
   82 
   83 /*
   84  * Asynchronously write to file
   85  */
   86 int     aio_write(struct aiocb *);
   87 
   88 /*
   89  * List I/O Asynchronously/synchronously read/write to/from file
   90  *      "lio_mode" specifies whether or not the I/O is synchronous.
   91  *      "acb_list" is an array of "nacb_listent" I/O control blocks.
   92  *      when all I/Os are complete, the optional signal "sig" is sent.
   93  */
   94 int     lio_listio(int, struct aiocb * const [], int, struct sigevent *);
   95 
   96 /*
   97  * Get completion status
   98  *      returns EINPROGRESS until I/O is complete.
   99  *      this routine does not block.
  100  */
  101 int     aio_error(const struct aiocb *);
  102 
  103 /*
  104  * Finish up I/O, releasing I/O resources and returns the value
  105  *      that would have been associated with a synchronous I/O request.
  106  *      This routine must be called once and only once for each
  107  *      I/O control block who has had I/O associated with it.
  108  */
  109 ssize_t aio_return(struct aiocb *);
  110 
  111 /*
  112  * Cancel I/O
  113  */
  114 int     aio_cancel(int, struct aiocb *);
  115 
  116 /*
  117  * Suspend until all specified I/O or timeout is complete.
  118  */
  119 int     aio_suspend(const struct aiocb * const[], int, const struct timespec *);
  120 
  121 int     aio_waitcomplete(struct aiocb **, struct timespec *);
  122 
  123 __END_DECLS
  124 
  125 #else
  126 
  127 /* Forward declarations for prototypes below. */
  128 struct socket;
  129 struct sockbuf;
  130 
  131 extern void (*aio_swake)(struct socket *, struct sockbuf *);
  132 
  133 #endif
  134 
  135 #endif

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