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aio_fsync(3) [netbsd man page]

AIO_FSYNC(3)						   BSD Library Functions Manual 					      AIO_FSYNC(3)

aio_fsync -- asynchronous data synchronization of file (REALTIME) LIBRARY
POSIX Real-time Library (librt, -lrt) SYNOPSIS
#include <aio.h> int aio_fsync(int op, struct aiocb *aiocbp); DESCRIPTION
The aio_fsync() system call allows the calling process to force all modified data associated with the file descriptor aiocbp->aio_fildes to be flushed to the stable storage device. The call returns immediately after the synchronization request has been enqueued to the descriptor; the synchronization may or may not have completed at the time the call returns. If the request could not be enqueued, generally due to invalid arguments, the call returns without having enqueued the request. The op argument could be set only to O_DSYNC or O_SYNC. If op is O_DSYNC, then aio_fsync() does the same as a fdatasync() call, if O_SYNC, then the same as fsync(). If _POSIX_PRIORITIZED_IO is defined, and the descriptor supports it, then the enqueued operation is submitted at a priority equal to that of the calling process minus aiocbp->aio_reqprio. The aiocbp pointer may be subsequently used as an argument to aio_return() and aio_error() in order to determine return or error status for the enqueued operation while it is in progress. RETURN VALUES
The aio_fsync() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indi- cate the error. ERRORS
The aio_fsync() system call will fail if: [EAGAIN] The request was not queued because of system resource limitations. The following conditions may be synchronously detected when the aio_fsync() system call is made, or asynchronously, at any time thereafter. If they are detected at call time, aio_fsync() returns -1 and sets errno appropriately; otherwise the aio_return() system call must be called, and will return -1, and aio_error() must be called to determine the actual value that would have been returned in errno. [EBADF] The aiocbp->aio_fildes is invalid for writing. [EINVAL] This implementation does not support synchronized I/O for this file, or the op argument is neither set to O_DSYNC nor O_SYNC. SEE ALSO
fcntl(2), fdatasync(2), fsync(2), aio(3) STANDARDS
The aio_fsync() system call is expected to conform to the IEEE Std 1003.1-2001 (``POSIX.1'') standard. HISTORY
The aio_fsync() system call first appeared in NetBSD 5.0. BSD
May 17, 2010 BSD

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AIO_FSYNC(3)						     Linux Programmer's Manual						      AIO_FSYNC(3)

aio_fsync - asynchronous file synchronization SYNOPSIS
#include <aio.h> int aio_fsync(int op, struct aiocb *aiocbp); Link with -lrt. DESCRIPTION
The aio_fsync() function does a sync on all outstanding asynchronous I/O operations associated with aiocbp->aio_fildes. (See aio(7) for a description of the aiocb structure.) More precisely, if op is O_SYNC, then all currently queued I/O operations shall be completed as if by a call of fsync(2), and if op is O_DSYNC, this call is the asynchronous analog of fdatasync(2). Note that this is a request only; it does not wait for I/O completion. Apart from aio_fildes, the only field in the structure pointed to by aiocbp that is used by this call is the aio_sigevent field (a sigevent structure, described in sigevent(7)), which indicates the desired type of asynchronous notification at completion. All other fields are ignored. RETURN VALUE
On success (the sync request was successfully queued) this function returns 0. On error, -1 is returned, and errno is set appropriately. ERRORS
EAGAIN Out of resources. EBADF aio_fildes is not a valid file descriptor open for writing. EINVAL Synchronized I/O is not supported for this file, or op is not O_SYNC or O_DSYNC. ENOSYS aio_fsync() is not implemented. VERSIONS
The aio_fsync() function is available since glibc 2.1. ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +------------+---------------+---------+ |Interface | Attribute | Value | +------------+---------------+---------+ |aio_fsync() | Thread safety | MT-Safe | +------------+---------------+---------+ CONFORMING TO
POSIX.1-2001, POSIX.1-2008. SEE ALSO
aio_cancel(3), aio_error(3), aio_read(3), aio_return(3), aio_suspend(3), aio_write(3), lio_listio(3), aio(7), sigevent(7) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at 2017-09-15 AIO_FSYNC(3)
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