022ca2fc7f
POSIX AIO is great, but it lacks vectored I/O functions. This commit fixes that shortcoming by adding aio_writev and aio_readv. They aren't part of the standard, but they're an obvious extension. They work just like their synchronous equivalents pwritev and preadv. It isn't yet possible to use vectored aiocbs with lio_listio, but that could be added in the future. Reviewed by: jhb, kib, bcr Relnotes: yes Differential Revision: https://reviews.freebsd.org/D27743
106 lines
2.8 KiB
Groff
106 lines
2.8 KiB
Groff
.\" Copyright (c) 1999 Softweyr LLC.
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.\" All rights reserved.
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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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY Softweyr LLC AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL Softweyr LLC OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd January 2, 2021
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.Dt AIO_ERROR 2
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.Os
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.Sh NAME
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.Nm aio_error
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.Nd retrieve error status of asynchronous I/O operation (REALTIME)
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In aio.h
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.Ft int
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.Fn aio_error "const struct aiocb *iocb"
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.Sh DESCRIPTION
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The
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.Fn aio_error
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system call returns the error status of the asynchronous I/O request
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associated with the structure pointed to by
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.Fa iocb .
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.Sh RETURN VALUES
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If the asynchronous I/O request has completed successfully,
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.Fn aio_error
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returns 0.
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If the request has not yet completed,
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.Er EINPROGRESS
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is returned.
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If the request has completed unsuccessfully the error
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status is returned as described in
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.Xr read 2 ,
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.Xr readv 2 ,
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.Xr write 2 ,
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.Xr writev 2 ,
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or
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.Xr fsync 2 .
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On failure,
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.Fn aio_error
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returns
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.Dv -1
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and sets
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.Dv errno
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to indicate the error condition.
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.Sh ERRORS
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The
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.Fn aio_error
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system call will fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The
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.Fa iocb
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argument
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does not reference an outstanding asynchronous I/O request.
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.El
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.Sh SEE ALSO
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.Xr aio_cancel 2 ,
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.Xr aio_read 2 ,
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.Xr aio_readv 2 ,
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.Xr aio_return 2 ,
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.Xr aio_suspend 2 ,
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.Xr aio_write 2 ,
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.Xr aio_writev 2 ,
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.Xr fsync 2 ,
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.Xr read 2 ,
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.Xr write 2 ,
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.Xr aio 4
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.Sh STANDARDS
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The
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.Fn aio_error
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system call
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is expected to conform to the
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.St -p1003.1
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standard.
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.Sh HISTORY
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The
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.Fn aio_error
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system call first appeared in
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.Fx 3.0 .
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.Sh AUTHORS
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This
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manual page was written by
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.An Wes Peters Aq Mt wes@softweyr.com .
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