Date: Thu, 26 Dec 2013 19:16:31 +0000 (UTC) From: Sergey Kandaurov <pluknet@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r259921 - head/lib/libc/sys Message-ID: <201312261916.rBQJGVcs034015@svn.freebsd.org>
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Author: pluknet Date: Thu Dec 26 19:16:30 2013 New Revision: 259921 URL: http://svnweb.freebsd.org/changeset/base/259921 Log: Provide the manual page for aio_fsync(2). Reviewed by: davidxu MFC after: 1 week Added: head/lib/libc/sys/aio_fsync.2 (contents, props changed) Modified: head/lib/libc/sys/Makefile.inc Modified: head/lib/libc/sys/Makefile.inc ============================================================================== --- head/lib/libc/sys/Makefile.inc Thu Dec 26 18:09:16 2013 (r259920) +++ head/lib/libc/sys/Makefile.inc Thu Dec 26 19:16:30 2013 (r259921) @@ -85,6 +85,7 @@ MAN+= abort2.2 \ adjtime.2 \ aio_cancel.2 \ aio_error.2 \ + aio_fsync.2 \ aio_mlock.2 \ aio_read.2 \ aio_return.2 \ Added: head/lib/libc/sys/aio_fsync.2 ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/lib/libc/sys/aio_fsync.2 Thu Dec 26 19:16:30 2013 (r259921) @@ -0,0 +1,152 @@ +.\" Copyright (c) 2013 Sergey Kandaurov +.\" All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" $FreeBSD$ +.\" +.Dd May 4, 2013 +.Dt AIO_FSYNC 2 +.Os +.Sh NAME +.Nm aio_fsync +.Nd asynchronous file synchronization (REALTIME) +.Sh LIBRARY +.Lb libc +.Sh SYNOPSIS +.In aio.h +.Ft int +.Fn aio_fsync "int op" "struct aiocb *iocb" +.Sh DESCRIPTION +The +.Fn aio_fsync +system call allows the calling process to move all modified data +associated with the descriptor +.Fa iocb->aio_fildes +to a permanent 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. +.Pp +The +.Fa op +argument could be set only to +.Dv O_SYNC +to cause all currently queued I/O operations to be completed +as if by a call to +.Xr fsync 2 . +.Pp +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 +.Fa iocb->aio_reqprio . +.Pp +The +.Fa iocb +pointer may be subsequently used as an argument to +.Fn aio_return +and +.Fn aio_error +in order to determine return or error status for the enqueued operation +while it is in progress. +.Pp +If the request could not be enqueued (generally due to invalid arguments), +the call returns without having enqueued the request. +.Sh RETURN VALUES +.Rv -std aio_fsync +.Sh ERRORS +The +.Fn aio_fsync +system call will fail if: +.Bl -tag -width Er +.It Bq Er EAGAIN +The request was not queued because of system resource limitations. +.It Bq Er ENOSYS +The +.Fn aio_fsync +system call is not supported. +.It Bq Er EINVAL +A value of the +.Fa op +argument is not set to +.Dv O_SYNC . +.El +.Pp +The following conditions may be synchronously detected when the +.Fn aio_fsync +system call is made, or asynchronously, at any time thereafter. +If they are detected at call time, +.Fn aio_fsync +returns -1 and sets +.Va errno +appropriately; otherwise the +.Fn aio_return +system call must be called, and will return -1, and +.Fn aio_error +must be called to determine the actual value that would have been +returned in +.Va errno . +.Bl -tag -width Er +.It Bq Er EBADF +The +.Fa iocb->aio_fildes +is invalid for writing. +.It Bq Er EINVAL +This implementation does not support synchronized I/O for this file. +.El +.Pp +If the request is successfully enqueued, but subsequently cancelled +or an error occurs, the value returned by the +.Fn aio_return +system call is per the +.Xr read 2 +and +.Xr write 2 +system calls, and the value returned by the +.Fn aio_error +system call is one of the error returns from the +.Xr read 2 +or +.Xr write 2 +system calls. +.Sh SEE ALSO +.Xr aio_cancel 2 , +.Xr aio_error 2 , +.Xr aio_read 2 , +.Xr aio_return 2 , +.Xr aio_suspend 2 , +.Xr aio_waitcomplete 2 , +.Xr aio_write 2 , +.Xr fsync 2 , +.Xr siginfo 3 , +.Xr aio 4 +.Sh STANDARDS +The +.Fn aio_fsync +system call is expected to conform to the +.St -p1003.1 +standard. +.Sh HISTORY +The +.Fn aio_fsync +system call first appeared in +.Fx 7.0 .
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