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  * $DragonFly: src/sys/sys/aio.h,v 1.3 2004/09/16 04:42:55 dillon Exp $
  18  */
  19
  20 #ifndef _SYS_AIO_H_
  21 #define _SYS_AIO_H_
  22
  23 #include <sys/time.h>
  24 #include <sys/types.h>
  25 #include <sys/signal.h>
  26
  27 /*
  28  * Returned by aio_cancel:
  29  */
  30 #define AIO_CANCELED            0x1
  31 #define AIO_NOTCANCELED         0x2
  32 #define AIO_ALLDONE             0x3
  33
  34 /*
  35  * LIO opcodes
  36  */
  37 #define LIO_NOP                 0x0
  38 #define LIO_WRITE               0x1
  39 #define LIO_READ                0x2
  40
  41 /*
  42  * LIO modes
  43  */
  44 #define LIO_NOWAIT              0x0
  45 #define LIO_WAIT                0x1
  46
  47 /*
  48  * Maximum number of allowed LIO operations
  49  */
  50 #define AIO_LISTIO_MAX          16
  51
  52 /*
  53  * Private members for aiocb -- don't access
  54  * directly.
  55  */
  56 struct __aiocb_private {
  57         int     status;
  58         int     error;
  59         void    *kernelinfo;
  60 };
  61
  62 /*
  63  * I/O control block
  64  */
  65 typedef struct aiocb {
  66         int     aio_fildes;             /* File descriptor */
  67         off_t   aio_offset;             /* File offset for I/O */
  68         volatile void *aio_buf;         /* I/O buffer in process space */
  69         size_t  aio_nbytes;             /* Number of bytes for I/O */
  70         struct  sigevent aio_sigevent;  /* Signal to deliver */
  71         int     aio_lio_opcode;         /* LIO opcode */
  72         int     aio_reqprio;            /* Request priority -- ignored */
  73         struct  __aiocb_private _aiocb_private;
  74 } aiocb_t;
  75
  76 #ifndef _KERNEL
  77
  78 __BEGIN_DECLS
  79 /*
  80  * Asynchronously read from a file
  81  */
  82 int     aio_read(struct aiocb *);
  83
  84 /*
  85  * Asynchronously write to file
  86  */
  87 int     aio_write(struct aiocb *);
  88
  89 /*
  90  * List I/O Asynchronously/synchronously read/write to/from file
  91  *      "lio_mode" specifies whether or not the I/O is synchronous.
  92  *      "acb_list" is an array of "nacb_listent" I/O control blocks.
  93  *      when all I/Os are complete, the optional signal "sig" is sent.
  94  */
  95 int     lio_listio(int, struct aiocb * const [], int, struct sigevent *);
  96
  97 /*
  98  * Get completion status
  99  *      returns EINPROGRESS until I/O is complete.
 100  *      this routine does not block.
 101  */
 102 int     aio_error(const struct aiocb *);
 103
 104 /*
 105  * Finish up I/O, releasing I/O resources and returns the value
 106  *      that would have been associated with a synchronous I/O request.
 107  *      This routine must be called once and only once for each
 108  *      I/O control block who has had I/O associated with it.
 109  */
 110 ssize_t aio_return(struct aiocb *);
 111
 112 /*
 113  * Cancel I/O
 114  */
 115 int     aio_cancel(int, struct aiocb *);
 116
 117 /*
 118  * Suspend until all specified I/O or timeout is complete.
 119  */
 120 int     aio_suspend(const struct aiocb * const[], int, const struct timespec *);
 121
 122 int     aio_waitcomplete(struct aiocb **, struct timespec *);
 123
 124 __END_DECLS
 125
 126 #else
 127 /*
 128  * Job queue item
 129  */
 130
 131 #define AIOCBLIST_RUNDOWN       0x4
 132 #define AIOCBLIST_DONE          0x10
 133
 134 struct aiocblist {
 135         TAILQ_ENTRY     (aiocblist) list;       /* List of jobs */
 136         TAILQ_ENTRY     (aiocblist) plist;      /* List of jobs for proc */
 137         int     jobflags;
 138         int     jobstate;
 139         int     inputcharge, outputcharge;
 140         struct  callout timeout;
 141         struct  buf *bp;                /* Buffer pointer */
 142         struct  proc *userproc;         /* User process */
 143         struct  file *fd_file;          /* Pointer to file structure */
 144         struct  aio_liojob *lio;        /* Optional lio job */
 145         struct  aiocb *uuaiocb;         /* Pointer in userspace of aiocb */
 146         struct  klist klist;            /* list of knotes */
 147         struct  aiocb uaiocb;           /* Kernel I/O control block */
 148 };
 149
 150 /* Forward declarations for prototypes below. */
 151 struct socket;
 152 struct sockbuf;
 153
 154 void    aio_proc_rundown(struct proc *p);
 155 void    aio_swake(struct socket *, struct sockbuf *);
 156
 157 #endif
 158
 159 #endif