129 lines
3.4 KiB
Groff
129 lines
3.4 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 June 2, 1999
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.Dt AIO_SUSPEND 2
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.Os
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.Sh NAME
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.Nm aio_suspend
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.Nd suspend until asynchronous I/O operations or timeout complete (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_suspend "const struct aiocb * const iocbs[]" "int niocb" "const struct timespec * timeout"
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.Sh DESCRIPTION
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The
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.Fn aio_suspend
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function suspends the calling process until at least one of the
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specified asynchronous I/O requests have completed, a signal is
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delivered, or the
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.Fa timeout
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has passed.
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.Pp
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.Fa iocbs
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is an array of
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.Fa niocb
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pointers to asynchronous I/O requests. Array members containing
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NULL will be silently ignored.
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.Pp
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If
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.Fa timeout
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is a non-nil pointer, it specifies a maximum interval to suspend.
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If
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.Fa timeout
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is a nil pointer, the suspend blocks indefinitely. To effect a
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poll, the
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.Fa timeout
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should point to a zero-value timespec structure.
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.Sh RETURN VALUES
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If one or more of the specified asynchronous I/O requests have
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completed,
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.Fn aio_suspend
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returns 0. Otherwise it returns -1 and sets
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.Va errno
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to indicate the error, as enumerated below.
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.Sh ERRORS
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The
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.Fn aio_suspend
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function will fail if:
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.Bl -tag -width Er
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.It Bq Er EAGAIN
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the
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.Fa timeout
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expired before any I/O requests completed.
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.It Bq Er EINVAL
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.Fa iocbs
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contains more than
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.Dv AIO_LISTIO_MAX
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asynchronous I/O requests, or at least one of the requests is not
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valid.
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.It Bq Er EINTR
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the suspend was interrupted by a signal.
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.El
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.Sh KERNEL OPTIONS
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The following kernel configuration option
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(see
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.Xr config 8 )
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is required:
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.Pp
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.Dl "options VFS_AIO"
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.Pp
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If you do not want AIO support included in the kernel, but
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want to use it occasionally, do not add the
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.Dv VFS_AIO
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option. Instead, load the
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.Nm aio
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module as desired:
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.Pp
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.Dl kldload aio
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.Pp
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.Sh SEE ALSO
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.Xr aio 4 ,
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.Xr aio_cancel 2 ,
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.Xr aio_error 2 ,
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.Xr aio_return 2 ,
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.Xr aio_waitcomplete 2 ,
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.Xr aio_write 2 ,
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.Xr config 8 ,
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.Xr kldload 8 ,
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.Xr kldunload 8
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.Sh STANDARDS
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.Fn aio_suspend
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is expected to conform to the
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.St -p1003.2
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standard.
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.Sh HISTORY
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The
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.Nm
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function 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 wes@softweyr.com .
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