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glibc/rt/aio.h
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/* 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 <features.h> | |
#include <fcntl.h> | |
#include <signal.h> | |
#define __need_timespec | |
#include <time.h> | |
#include <sys/types.h> | |
__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)); | |
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 */ |