sys/sys/aio.h

   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  */
  18
  19 #ifndef _SYS_AIO_H_
  20 #define _SYS_AIO_H_
  21
  22 #include <sys/_pthreadtypes.h>
  23 #include <sys/_timespec.h>
  24 #include <sys/signal.h>
  25 #include <sys/stdint.h>
  26
  27 #ifndef _OFF_T_DECLARED
  28 typedef __off_t         off_t;
  29 #define _OFF_T_DECLARED
  30 #endif
  31
  32 #ifndef _SIZE_T_DECLARED
  33 #define _SIZE_T_DECLARED
  34 typedef __size_t        size_t;
  35 #endif
  36
  37 #ifndef _SSIZE_T_DECLARED
  38 #define _SSIZE_T_DECLARED
  39 typedef __ssize_t       ssize_t;
  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