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/* Copyright (C) 1996-2021 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/*
* ISO/IEC 9945-1:1996 6.7: Asynchronous Input and Output
*/
#ifndef _AIO_H
#define _AIO_H 1
#include <features.h>
#include <sys/types.h>
#include <bits/types/sigevent_t.h>
#include <bits/sigevent-consts.h>
#include <bits/types/struct_timespec.h>
__BEGIN_DECLS
/* Asynchronous I/O control block. */
struct aiocb
{
int aio_fildes; /* File descriptor. */
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 __glibc_reserved[32];
};
/* The same for the 64bit offsets. Please note that the members aio_fildes
to __return_value have to be the same in aiocb and aiocb64. */
#ifdef __USE_LARGEFILE64
struct aiocb64
{
int aio_fildes; /* File descriptor. */
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;
__off64_t aio_offset; /* File offset. */
char __glibc_reserved[32];
};
#endif
#ifdef __USE_GNU
/* To optimize the implementation one can use the following struct. */
struct aioinit
{
int aio_threads; /* Maximum number of threads. */
int aio_num; /* Number of expected simultaneous requests. */
int aio_locks; /* Not used. */
int aio_usedba; /* Not used. */
int aio_debug; /* Not used. */
int aio_numusers; /* Not used. */
int aio_idle_time; /* Number of seconds before idle thread
terminates. */
int aio_reserved;
};
#endif
/* Return values of the aio_cancel 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 (const struct aioinit *__init) __THROW __nonnull ((1));
#endif
#ifndef __USE_FILE_OFFSET64
/* Enqueue read request for given number of bytes and the given priority. */
extern int aio_read (struct aiocb *__aiocbp) __THROW __nonnull ((1));
/* Enqueue write request for given number of bytes and the given priority. */
extern int aio_write (struct aiocb *__aiocbp) __THROW __nonnull ((1));
/* Initiate list of I/O requests. */
extern int lio_listio (int __mode,
struct aiocb *const __list[__restrict_arr],
int __nent, struct sigevent *__restrict __sig)
__THROW __nonnull ((2));
/* Retrieve error status associated with AIOCBP. */
extern int aio_error (const struct aiocb *__aiocbp) __THROW __nonnull ((1));
/* Return status associated with AIOCBP. */
extern __ssize_t aio_return (struct aiocb *__aiocbp) __THROW __nonnull ((1));
/* Try to cancel asynchronous I/O requests outstanding against file
descriptor FILDES. */
extern int aio_cancel (int __fildes, struct aiocb *__aiocbp) __THROW;
/* Suspend calling thread until at least one of the asynchronous I/O
operations referenced by LIST has completed.
This function is a cancellation point and therefore not marked with
__THROW. */
extern int aio_suspend (const struct aiocb *const __list[], int __nent,
const struct timespec *__restrict __timeout)
__nonnull ((1));
/* Force all operations associated with file desriptor described by
`aio_fildes' member of AIOCBP. */
extern int aio_fsync (int __operation, struct aiocb *__aiocbp)
__THROW __nonnull ((2));
#else
# ifdef __REDIRECT_NTH
extern int __REDIRECT_NTH (aio_read, (struct aiocb *__aiocbp), aio_read64)
__nonnull ((1));
extern int __REDIRECT_NTH (aio_write, (struct aiocb *__aiocbp), aio_write64)
__nonnull ((1));
extern int __REDIRECT_NTH (lio_listio,
(int __mode,
struct aiocb *const __list[__restrict_arr],
int __nent, struct sigevent *__restrict __sig),
lio_listio64) __nonnull ((2));
extern int __REDIRECT_NTH (aio_error, (const struct aiocb *__aiocbp),
aio_error64) __nonnull ((1));
extern __ssize_t __REDIRECT_NTH (aio_return, (struct aiocb *__aiocbp),
aio_return64) __nonnull ((1));
extern int __REDIRECT_NTH (aio_cancel,
(int __fildes, struct aiocb *__aiocbp),
aio_cancel64);
# ifdef __USE_TIME_BITS64
extern int __REDIRECT_NTH (aio_suspend,
(const struct aiocb *const __list[], int __nent,
const struct timespec *__restrict __timeout),
__aio_suspend_time64) __nonnull ((1));
# else
extern int __REDIRECT_NTH (aio_suspend,
(const struct aiocb *const __list[], int __nent,
const struct timespec *__restrict __timeout),
aio_suspend64) __nonnull ((1));
# endif
extern int __REDIRECT_NTH (aio_fsync,
(int __operation, struct aiocb *__aiocbp),
aio_fsync64) __nonnull ((2));
# 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
# ifdef __USE_TIME_BITS64
# define aio_suspend __aio_suspend_time64
# else
# define aio_suspend aio_suspend64
# endif
# define aio_fsync aio_fsync64
# endif
#endif
#ifdef __USE_LARGEFILE64
extern int aio_read64 (struct aiocb64 *__aiocbp) __THROW __nonnull ((1));
extern int aio_write64 (struct aiocb64 *__aiocbp) __THROW __nonnull ((1));
extern int lio_listio64 (int __mode,
struct aiocb64 *const __list[__restrict_arr],
int __nent, struct sigevent *__restrict __sig)
__THROW __nonnull ((2));
extern int aio_error64 (const struct aiocb64 *__aiocbp)
__THROW __nonnull ((1));
extern __ssize_t aio_return64 (struct aiocb64 *__aiocbp)
__THROW __nonnull ((1));
extern int aio_cancel64 (int __fildes, struct aiocb64 *__aiocbp) __THROW;
extern int aio_suspend64 (const struct aiocb64 *const __list[], int __nent,
const struct timespec *__restrict __timeout)
__THROW __nonnull ((1));
extern int aio_fsync64 (int __operation, struct aiocb64 *__aiocbp)
__THROW __nonnull ((2));
#endif
__END_DECLS
#endif /* aio.h */
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