rt/aio.h

   1 /* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 /*
  20  * ISO/IEC 9945-1:1996 6.7: Asynchronous Input and Output
  21  */
  22
  23 #ifndef _AIO_H
  24 #define _AIO_H  1
  25
  26 #include <features.h>
  27 #include <fcntl.h>
  28 #include <signal.h>
  29 #define __need_timespec
  30 #include <time.h>
  31 #include <sys/types.h>
  32
  33 __BEGIN_DECLS
  34
  35 /* Asynchronous I/O control block.  */
  36 struct aiocb
  37 {
  38   int aio_fildes;               /* File desriptor.  */
  39   int aio_lio_opcode;           /* Operation to be performed.  */
  40   int aio_reqprio;              /* Request priority offset.  */
  41   volatile void *aio_buf;       /* Location of buffer.  */
  42   size_t aio_nbytes;            /* Length of transfer.  */
  43   struct sigevent aio_sigevent; /* Signal number and value.  */
  44
  45   /* Internal members.  */
  46   struct aiocb *__next_prio;
  47   int __abs_prio;
  48   int __policy;
  49   int __error_code;
  50   __ssize_t __return_value;
  51
  52 #ifndef __USE_FILE_OFFSET64
  53   __off_t aio_offset;           /* File offset.  */
  54   char __pad[sizeof (__off64_t) - sizeof (__off_t)];
  55 #else
  56   __off64_t aio_offset;         /* File offset.  */
  57 #endif
  58   char __unused[32];
  59 };
  60
  61 /* The same for the 64bit offsets.  */
  62 #ifdef __USE_LARGEFILE64
  63 struct aiocb64
  64 {
  65   int aio_fildes;               /* File desriptor.  */
  66   int aio_lio_opcode;           /* Operation to be performed.  */
  67   int aio_reqprio;              /* Request priority offset.  */
  68   volatile void *aio_buf;       /* Location of buffer.  */
  69   size_t aio_nbytes;            /* Length of transfer.  */
  70   struct sigevent aio_sigevent; /* Signal number and value.  */
  71
  72   /* Internal members.  */
  73   int __abs_prio;
  74   int __policy;
  75   int __error_code;
  76   __ssize_t __return_value;
  77
  78   __off64_t aio_offset;         /* File offset.  */
  79   char __unused[32];
  80 };
  81 #endif
  82
  83
  84 #ifdef __USE_GNU
  85 /* To customize the implementation one can use the following struct.
  86    This implementation follows the one in Irix.  */
  87 struct aioinit
  88   {
  89     int aio_threads;            /* Maximal number of threads.  */
  90     int aio_num;                /* Number of expected simultanious requests. */
  91     int aio_locks;              /* Not used.  */
  92     int aio_usedba;             /* Not used.  */
  93     int aio_debug;              /* Not used.  */
  94     int aio_numusers;           /* Not used.  */
  95     int aio_reserved[2];
  96   };
  97 #endif
  98
  99
 100 /* Return values of cancelation function.  */
 101 enum
 102 {
 103   AIO_CANCELED,
 104 #define AIO_CANCELED AIO_CANCELED
 105   AIO_NOTCANCELED,
 106 #define AIO_NOTCANCELED AIO_NOTCANCELED
 107   AIO_ALLDONE
 108 #define AIO_ALLDONE AIO_ALLDONE
 109 };
 110
 111
 112 /* Operation codes for `aio_lio_opcode'.  */
 113 enum
 114 {
 115   LIO_READ,
 116 #define LIO_READ LIO_READ
 117   LIO_WRITE,
 118 #define LIO_WRITE LIO_WRITE
 119   LIO_NOP
 120 #define LIO_NOP LIO_NOP
 121 };
 122
 123
 124 /* Synchronization options for `lio_listio' function.  */
 125 enum
 126 {
 127   LIO_WAIT,
 128 #define LIO_WAIT LIO_WAIT
 129   LIO_NOWAIT
 130 #define LIO_NOWAIT LIO_NOWAIT
 131 };
 132
 133
 134 /* Allow user to specify optimization.  */
 135 #ifdef __USE_GNU
 136 extern void __aio_init __P ((__const struct aioinit *__init));
 137 extern void aio_init __P ((__const struct aioinit *__init));
 138 #endif
 139
 140
 141 /* Enqueue read request for given number of bytes and the given priority.  */
 142 #ifndef __USE_FILE_OFFSET64
 143 extern int aio_read __P ((struct aiocb *__aiocbp));
 144 #else
 145 extern int aio_read __P ((struct aiocb *__aiocbp)) __asm__ ("aio_read64");
 146 #endif
 147 #ifdef __USE_LARGEFILE64
 148 extern int aio_read64 __P ((struct aiocb64 *__aiocbp));
 149 #endif
 150
 151 /* Enqueue write request for given number of bytes and the given priority.  */
 152 #ifndef __USE_FILE_OFFSET64
 153 extern int aio_write __P ((struct aiocb *__aiocbp));
 154 #else
 155 extern int aio_write __P ((struct aiocb *__aiocbp)) __asm__ ("aio_write64");
 156 #endif
 157 #ifdef __USE_LARGEFILE64
 158 extern int aio_write64 __P ((struct aiocb64 *__aiocbp));
 159 #endif
 160
 161
 162 /* Initiate list of I/O requests.  */
 163 #ifndef __USE_FILE_OFFSET64
 164 extern int lio_listio __P ((int __mode, struct aiocb *__const __list[],
 165                             int __nent, struct sigevent *__sig));
 166 #else
 167 extern int lio_listio __P ((int __mode, struct aiocb *__const __list[],
 168                             int __nent, struct sigevent *__sig))
 169      __asm__ ("lio_listio64");
 170 #endif
 171 #ifdef __USE_LARGEFILE64
 172 extern int lio_listio64 __P ((int __mode, struct aiocb64 *__const __list[],
 173                               int __nent, struct sigevent *__sig));
 174 #endif
 175
 176
 177 /* Retrieve error status associated with AIOCBP.  */
 178 #ifndef __USE_FILE_OFFSET64
 179 extern int aio_error __P ((__const struct aiocb *__aiocbp));
 180 #else
 181 extern int aio_error __P ((__const struct aiocb *__aiocbp))
 182      __asm__ ("aio_error64");
 183 #endif
 184 #ifdef __USE_LARGEFILE64
 185 extern int aio_error64 __P ((__const struct aiocb64 *__aiocbp));
 186 #endif
 187
 188
 189 /* Return status associated with AIOCBP.  */
 190 #ifndef __USE_FILE_OFFSET64
 191 extern __ssize_t aio_return __P ((struct aiocb *__aiocbp));
 192 #else
 193 extern __ssize_t aio_return __P ((struct aiocb *__aiocbp))
 194      __asm__ ("aio_return64");
 195 #endif
 196 #ifdef __USE_LARGEFILE64
 197 extern __ssize_t aio_return64 __P ((struct aiocb64 *__aiocbp));
 198 #endif
 199
 200
 201 /* Try to cancel asynchronous I/O requests outstanding against file
 202    descriptot FILDES.  */
 203 #ifndef __USE_FILE_OFFSET64
 204 extern int aio_cancel __P ((int __fildes, struct aiocb *__aiocbp));
 205 #else
 206 extern int aio_cancel __P ((int __fildes, struct aiocb *__aiocbp))
 207      __asm__ ("aio_cancel64");
 208 #endif
 209 #ifdef __USE_LARGEFILE64
 210 extern int aio_cancel64 __P ((int __fildes, struct aiocb64 *__aiocbp));
 211 #endif
 212
 213
 214 /* Suspend calling thread until at least one of the asynchronous I/O
 215    operations referenced by LIST has completed.  */
 216 #ifndef __USE_FILE_OFFSET64
 217 extern int aio_suspend __P ((__const struct aiocb *__const __list[],
 218                              int __nent, __const struct timespec *__timeout));
 219 #else
 220 extern int aio_suspend __P ((__const struct aiocb *__const __list[],
 221                              int __nent, __const struct timespec *__timeout))
 222      __asm__ ("aio_suspend64");
 223 #endif
 224 #ifdef __USE_LARGEFILE64
 225 extern int aio_suspend64 __P ((__const struct aiocb64 *__const __list[],
 226                                int __nent,
 227                                __const struct timespec *__timeout));
 228 #endif
 229
 230
 231 /* Force all operations associated with file desriptor described by
 232    `aio_fildes' member of AIOCBP.  */
 233 #ifndef __USE_FILE_OFFSET64
 234 extern int aio_fsync __P ((int __op, struct aiocb *__aiocbp));
 235 #else
 236 extern int aio_fsync __P ((int __op, struct aiocb *__aiocbp))
 237      __asm__ ("aio_fsync64");
 238 #endif
 239 #ifdef __USE_LARGEFILE64
 240 extern int aio_fsync64 __P ((int __op, struct aiocb64 *__aiocbp));
 241 #endif
 242
 243
 244 __END_DECLS
 245
 246 #endif /* aio.h */