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  * $FreeBSD$
   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 #ifdef _KERNEL
   40 #define LIO_SYNC                0x3
   41 #endif
   42 
   43 /*
   44  * LIO modes
   45  */
   46 #define LIO_NOWAIT              0x0
   47 #define LIO_WAIT                0x1
   48 
   49 /*
   50  * Maximum number of allowed LIO operations
   51  */
   52 #define AIO_LISTIO_MAX          16
   53 
   54 /*
   55  * Private members for aiocb -- don't access
   56  * directly.
   57  */
   58 struct __aiocb_private {
   59         long    status;
   60         long    error;
   61         void    *kernelinfo;
   62 };
   63 
   64 /*
   65  * I/O control block
   66  */
   67 typedef struct aiocb {
   68         int     aio_fildes;             /* File descriptor */
   69         off_t   aio_offset;             /* File offset for I/O */
   70         volatile void *aio_buf;         /* I/O buffer in process space */
   71         size_t  aio_nbytes;             /* Number of bytes for I/O */
   72         char    __spare__[sizeof(int) * 2 + sizeof(void *)]; /* osigevent. */
   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 __BEGIN_DECLS
   82 /*
   83  * Asynchronously read from a file
   84  */
   85 int     aio_read(struct aiocb *);
   86 
   87 /*
   88  * Asynchronously write to file
   89  */
   90 int     aio_write(struct aiocb *);
   91 
   92 /*
   93  * List I/O Asynchronously/synchronously read/write to/from file
   94  *      "lio_mode" specifies whether or not the I/O is synchronous.
   95  *      "acb_list" is an array of "nacb_listent" I/O control blocks.
   96  *      when all I/Os are complete, the optional signal "sig" is sent.
   97  */
   98 int     lio_listio(int, struct aiocb * const [], int, struct sigevent *);
   99 
  100 /*
  101  * Get completion status
  102  *      returns EINPROGRESS until I/O is complete.
  103  *      this routine does not block.
  104  */
  105 int     aio_error(const struct aiocb *);
  106 
  107 /*
  108  * Finish up I/O, releasing I/O resources and returns the value
  109  *      that would have been associated with a synchronous I/O request.
  110  *      This routine must be called once and only once for each
  111  *      I/O control block who has had I/O associated with it.
  112  */
  113 ssize_t aio_return(struct aiocb *);
  114 
  115 /*
  116  * Cancel I/O
  117  */
  118 int     aio_cancel(int, struct aiocb *);
  119 
  120 /*
  121  * Suspend until all specified I/O or timeout is complete.
  122  */
  123 int     aio_suspend(const struct aiocb * const[], int, const struct timespec *);
  124 
  125 int     aio_waitcomplete(struct aiocb **, struct timespec *);
  126 
  127 int     aio_fsync(int op, struct aiocb *aiocbp);
  128 __END_DECLS
  129 
  130 #else
  131 
  132 /* Forward declarations for prototypes below. */
  133 struct socket;
  134 struct sockbuf;
  135 
  136 extern void (*aio_swake)(struct socket *, struct sockbuf *);
  137 
  138 #endif
  139 
  140 #endif

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