/* Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* * ISO/IEC 9945-1:1996 6.7: Asynchronous Input and Output */ #ifndef _AIO_H #define _AIO_H 1 #include #include #include #include #include __BEGIN_DECLS /* Asynchronous I/O control block. */ struct aiocb { int aio_fildes; /* File desriptor. */ int aio_lio_opcode; /* Operation to be performed. */ int aio_reqprio; /* Request priority offset. */ volatile void *aio_buf; /* Location of buffer. */ size_t aio_nbytes; /* Length of transfer. */ struct sigevent aio_sigevent; /* Signal number and value. */ /* Internal members. */ struct aiocb *__next_prio; int __abs_prio; int __policy; int __error_code; __ssize_t __return_value; #ifndef __USE_FILE_OFFSET64 __off_t aio_offset; /* File offset. */ char __pad[sizeof (__off64_t) - sizeof (__off_t)]; #else __off64_t aio_offset; /* File offset. */ #endif char __unused[32]; }; /* The same for the 64bit offsets. */ #ifdef __USE_LARGEFILE64 struct aiocb64 { int aio_fildes; /* File desriptor. */ int aio_lio_opcode; /* Operation to be performed. */ int aio_reqprio; /* Request priority offset. */ volatile void *aio_buf; /* Location of buffer. */ size_t aio_nbytes; /* Length of transfer. */ struct sigevent aio_sigevent; /* Signal number and value. */ /* Internal members. */ int __abs_prio; int __policy; int __error_code; __ssize_t __return_value; __off64_t aio_offset; /* File offset. */ char __unused[32]; }; #endif #ifdef __USE_GNU /* To customize the implementation one can use the following struct. This implementation follows the one in Irix. */ struct aioinit { int aio_threads; /* Maximal number of threads. */ int aio_num; /* Number of expected simultanious requests. */ int aio_locks; /* Not used. */ int aio_usedba; /* Not used. */ int aio_debug; /* Not used. */ int aio_numusers; /* Not used. */ int aio_reserved[2]; }; #endif /* Return values of cancelation function. */ enum { AIO_CANCELED, #define AIO_CANCELED AIO_CANCELED AIO_NOTCANCELED, #define AIO_NOTCANCELED AIO_NOTCANCELED AIO_ALLDONE #define AIO_ALLDONE AIO_ALLDONE }; /* Operation codes for `aio_lio_opcode'. */ enum { LIO_READ, #define LIO_READ LIO_READ LIO_WRITE, #define LIO_WRITE LIO_WRITE LIO_NOP #define LIO_NOP LIO_NOP }; /* Synchronization options for `lio_listio' function. */ enum { LIO_WAIT, #define LIO_WAIT LIO_WAIT LIO_NOWAIT #define LIO_NOWAIT LIO_NOWAIT }; /* Allow user to specify optimization. */ #ifdef __USE_GNU extern void aio_init __P ((__const struct aioinit *__init)); #endif #ifndef __USE_FILE_OFFSET64 /* Enqueue read request for given number of bytes and the given priority. */ extern int aio_read __P ((struct aiocb *__aiocbp)); /* Enqueue write request for given number of bytes and the given priority. */ extern int aio_write __P ((struct aiocb *__aiocbp)); /* Initiate list of I/O requests. */ extern int lio_listio __P ((int __mode, struct aiocb *__const __list[], int __nent, struct sigevent *__sig)); /* Retrieve error status associated with AIOCBP. */ extern int aio_error __P ((__const struct aiocb *__aiocbp)); /* Return status associated with AIOCBP. */ extern __ssize_t aio_return __P ((struct aiocb *__aiocbp)); /* Try to cancel asynchronous I/O requests outstanding against file descriptor FILDES. */ extern int aio_cancel __P ((int __fildes, struct aiocb *__aiocbp)); /* Suspend calling thread until at least one of the asynchronous I/O operations referenced by LIST has completed. */ extern int aio_suspend __P ((__const struct aiocb *__const __list[], int __nent, __const struct timespec *__timeout)); /* Force all operations associated with file desriptor described by `aio_fildes' member of AIOCBP. */ extern int aio_fsync __P ((int __operation, struct aiocb *__aiocbp)); #else # ifdef __REDIRECT extern int __REDIRECT (aio_read, __P ((struct aiocb *__aiocbp)), aio_read64); extern int __REDIRECT (aio_write, __P ((struct aiocb *__aiocbp)), aio_write64); extern int __REDIRECT (lio_listio, __P ((int __mode, struct aiocb *__const __list[], int __nent, struct sigevent *__sig)), lio_listio64); extern int __REDIRECT (aio_error, __P ((__const struct aiocb *__aiocbp)), aio_error64); extern __ssize_t __REDIRECT (aio_return, __P ((struct aiocb *__aiocbp)), aio_return64); extern int __REDIRECT (aio_cancel, __P ((int __fildes, struct aiocb *__aiocbp)), aio_cancel64); extern int __REDIRECT (aio_suspend, __P ((__const struct aiocb *__const __list[], int __nent, __const struct timespec *__timeout)), aio_suspend64); extern int __REDIRECT (aio_fsync __P ((int __operation, struct aiocb *__aiocbp)), aio_fsync64); # else # define aio_read aio_read64 # define aio_write aio_write64 # define lio_listio lio_listio64 # define aio_error aio_error64 # define aio_return aio_return64 # define aio_cancel aio_cancel64 # define aio_suspend aio_suspend64 # define aio_fsync aio_fsync64 # endif #endif #ifdef __USE_LARGEFILE64 extern int aio_read64 __P ((struct aiocb64 *__aiocbp)); extern int aio_write64 __P ((struct aiocb64 *__aiocbp)); extern int lio_listio64 __P ((int __mode, struct aiocb64 *__const __list[], int __nent, struct sigevent *__sig)); extern int aio_error64 __P ((__const struct aiocb64 *__aiocbp)); extern __ssize_t aio_return64 __P ((struct aiocb64 *__aiocbp)); extern int aio_cancel64 __P ((int __fildes, struct aiocb64 *__aiocbp)); extern int aio_suspend64 __P ((__const struct aiocb64 *__const __list[], int __nent, __const struct timespec *__timeout)); extern int aio_fsync64 __P ((int __operation, struct aiocb64 *__aiocbp)); #endif __END_DECLS #endif /* aio.h */