103 lines
3.4 KiB
Groff
103 lines
3.4 KiB
Groff
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.\" $NetBSD: fdatasync.2,v 1.1 1998/06/05 20:48:59 kleink Exp $
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.\"
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.\" Copyright (c) 1998 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Klaus Klein.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd May 30, 1998
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.Dt FDATASYNC 2
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.Os NetBSD 1.4
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.Sh NAME
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.Nm fdatasync
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.Nd synchronise the data of a file
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.Sh SYNOPSIS
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.Fd #include <unistd.h>
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.Ft int
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.Fn fdatasync "int filedes"
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.Sh DESCRIPTION
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The
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.Fn fdatasync
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function forces all currently queued I/O operations associated with
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the file indicated by the file descriptor
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.Fa filedes
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to the synchronised I/O completition state.
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.Pp
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The functionality is as described for
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.Xr fsync 2 ,
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with the exception that all I/O operations are completed as defined
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for synchronised I/O data integrity completion.
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.Pp
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.Sh RETURN VALUES
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If successful, the
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.Fn fdatasync
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function returns the value 0. Otherwise, the function returns the
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value -1 and sets
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.Dv errno
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to indicate the error. If the
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.Fn fdatasync
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function fails, outstanding I/O operations are not
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guaranteed to have been completed.
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.Sh ERRORS
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The
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.Fn fdatasync
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function will fail if:
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.Bl -tag -width Er
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.It Bq Er EBADF
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The
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.Fa filedes
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argument is not a valid file descriptor.
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.It Bq Er EINVAL
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This implementation does not support syncronised I/O for this file.
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.It Bq Er ENOSYS
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The function
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.Fn fdatasync
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is not supported by this implementation.
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.El
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.Pp
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In the event that any of the queued I/O operations fail,
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.Fn fdatasync
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returns the eror conditions defined for
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.Xr read 2
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and
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.Xr write 2 .
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.Sh SEE ALSO
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.Xr fsync 2 ,
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.Xr open 2 ,
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.Xr read 2 ,
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.Xr write 2
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.Sh STANDARDS
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The
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.Fn fdatasync
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function conforms to
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.St -p1003.1b-93 .
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