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aio.h
/* 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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