PROLOG<\/a> This manual page is part of the POSIX Programmer\u2019s Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.<\/p>\n aio_fsync \u2014 asynchronous file synchronization<\/p>\n #include int aio_fsync(int op<\/i>, struct aiocb *aiocbp<\/i>);<\/p>\n The aio_fsync<\/i>() function shall asynchronously perform a file synchronization operation, as specified by the op<\/i> argument, for I\/O operations associated with the file indicated by the file descriptor aio_fildes<\/i> member of the aiocb<\/b> structure referenced by the aiocbp<\/i> argument and queued at the time of the call to aio_fsync<\/i>(). The function call shall return when the synchronization request has been initiated or queued to the file or device (even when the data cannot be synchronized immediately).<\/p>\n If op<\/i> is O_DSYNC, all currently queued I\/O operations shall be completed as if by a call to fdatasync<\/i>(); that is, as defined for synchronized I\/O data integrity completion.<\/p>\n If op<\/i> is O_SYNC, all currently queued I\/O operations shall be completed as if by a call to fsync<\/i>(); that is, as defined for synchronized I\/O file integrity completion. If the aio_fsync<\/i>() function fails, or if the operation queued by aio_fsync<\/i>() fails, then outstanding I\/O operations are not guaranteed to have been completed.<\/p>\n If aio_fsync<\/i>() succeeds, then it is only the I\/O that was queued at the time of the call to aio_fsync<\/i>() that is guaranteed to be forced to the relevant completion state. The completion of subsequent I\/O on the file descriptor is not guaranteed to be completed in a synchronized fashion.<\/p>\n The aiocbp<\/i> argument refers to an asynchronous I\/O control block. The aiocbp<\/i> value may be used as an argument to aio_error<\/i>() and aio_return<\/i>() in order to determine the error status and return status, respectively, of the asynchronous operation while it is proceeding. When the request is queued, the error status for the operation is [EINPROGRESS]<\/b>. When all data has been successfully transferred, the error status shall be reset to reflect the success or failure of the operation. If the operation does not complete successfully, the error status for the operation shall be set to indicate the error. The aio_sigevent<\/i> member determines the asynchronous notification to occur as specified in Section 2.4.1<\/i>, Signal Generation and Delivery<\/i> when all operations have achieved synchronized I\/O completion. All other members of the structure referenced by aiocbp<\/i> are ignored. If the control block referenced by aiocbp<\/i> becomes an illegal address prior to asynchronous I\/O completion, then the behavior is undefined.<\/p>\n If the aio_fsync<\/i>() function fails or aiocbp<\/i> indicates an error condition, data is not guaranteed to have been successfully transferred.<\/p>\n The aio_fsync<\/i>() function shall return the value 0 if the I\/O operation is successfully queued; otherwise, the function shall return the value \u22121 and set errno<\/i> to indicate the error.<\/p>\n The aio_fsync<\/i>() function shall fail if:<\/p>\n
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