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: src/sys/sys/aio.h,v 1.13.2.8 2002/08/31 03:18:23 alc Exp $
   17  * $DragonFly: src/sys/sys/aio.h,v 1.5 2007/04/22 01:13:16 dillon Exp $
   18  */
   19 
   20 #ifndef _SYS_AIO_H_
   21 #define _SYS_AIO_H_
   22 
   23 #ifndef _SYS_TYPES_H_
   24 #include <sys/types.h>
   25 #endif
   26 #ifndef _SYS_TIME_H_
   27 #include <sys/time.h>
   28 #endif
   29 #ifndef _SYS_SIGNAL_H_
   30 #include <sys/signal.h>
   31 #endif
   32 #ifndef _SYS_QUEUE_H_
   33 #include <sys/queue.h>
   34 #endif
   35 #ifndef _SYS_CALLOUT_H_
   36 #include <sys/callout.h>
   37 #endif
   38 #ifndef _SYS_EVENT_H_
   39 #include <sys/event.h>
   40 #endif
   41 
   42 /*
   43  * Returned by aio_cancel:
   44  */
   45 #define AIO_CANCELED            0x1
   46 #define AIO_NOTCANCELED         0x2
   47 #define AIO_ALLDONE             0x3
   48 
   49 /*
   50  * LIO opcodes
   51  */
   52 #define LIO_NOP                 0x0
   53 #define LIO_WRITE               0x1
   54 #define LIO_READ                0x2
   55 
   56 /*
   57  * LIO modes
   58  */
   59 #define LIO_NOWAIT              0x0
   60 #define LIO_WAIT                0x1
   61 
   62 /*
   63  * Maximum number of allowed LIO operations
   64  */
   65 #define AIO_LISTIO_MAX          16
   66 
   67 /*
   68  * I/O control block
   69  */
   70 typedef struct aiocb {
   71         int     aio_fildes;             /* File descriptor */
   72         off_t   aio_offset;             /* File offset for I/O */
   73         volatile void *aio_buf;         /* I/O buffer in process space */
   74         size_t  aio_nbytes;             /* Number of bytes for I/O */
   75         struct  sigevent aio_sigevent;  /* Signal to deliver */
   76         int     aio_lio_opcode;         /* LIO opcode */
   77         int     aio_reqprio;            /* Request priority -- ignored */
   78 
   79         int     _aio_val;
   80         int     _aio_err;
   81 } aiocb_t;
   82 
   83 #ifndef _KERNEL
   84 
   85 __BEGIN_DECLS
   86 /*
   87  * Asynchronously read from a file
   88  */
   89 int     aio_read(struct aiocb *);
   90 
   91 /*
   92  * Asynchronously write to file
   93  */
   94 int     aio_write(struct aiocb *);
   95 
   96 /*
   97  * List I/O Asynchronously/synchronously read/write to/from file
   98  *      "lio_mode" specifies whether or not the I/O is synchronous.
   99  *      "acb_list" is an array of "nacb_listent" I/O control blocks.
  100  *      when all I/Os are complete, the optional signal "sig" is sent.
  101  */
  102 int     lio_listio(int, struct aiocb * const [], int, struct sigevent *);
  103 
  104 /*
  105  * Get completion status
  106  *      returns EINPROGRESS until I/O is complete.
  107  *      this routine does not block.
  108  */
  109 int     aio_error(const struct aiocb *);
  110 
  111 /*
  112  * Finish up I/O, releasing I/O resources and returns the value
  113  *      that would have been associated with a synchronous I/O request.
  114  *      This routine must be called once and only once for each
  115  *      I/O control block who has had I/O associated with it.
  116  */
  117 ssize_t aio_return(struct aiocb *);
  118 
  119 /*
  120  * Cancel I/O
  121  */
  122 int     aio_cancel(int, struct aiocb *);
  123 
  124 /*
  125  * Suspend until all specified I/O or timeout is complete.
  126  */
  127 int     aio_suspend(const struct aiocb * const[], int, const struct timespec *);
  128 
  129 /*
  130  * Synchronize I/O
  131  */
  132 int     aio_fsync(int, struct aiocb *);
  133 
  134 int     aio_waitcomplete(struct aiocb **, struct timespec *);
  135 
  136 __END_DECLS
  137 
  138 #endif
  139 
  140 #endif

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