mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-22 11:17:19 +00:00
118 lines
3.2 KiB
Groff
118 lines
3.2 KiB
Groff
.\" Copyright (c) 1999 Softweyr LLC.
|
|
.\" 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 Softweyr LLC 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 Softweyr LLC 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 Oct 23, 2017
|
|
.Dt AIO_SUSPEND 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm aio_suspend
|
|
.Nd suspend until asynchronous I/O operations or timeout complete (REALTIME)
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In aio.h
|
|
.Ft int
|
|
.Fn aio_suspend "const struct aiocb *const iocbs[]" "int niocb" "const struct timespec *timeout"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn aio_suspend
|
|
system call suspends the calling process until at least one of the
|
|
specified asynchronous I/O requests have completed, a signal is
|
|
delivered, or the
|
|
.Fa timeout
|
|
has passed.
|
|
.Pp
|
|
The
|
|
.Fa iocbs
|
|
argument
|
|
is an array of
|
|
.Fa niocb
|
|
pointers to asynchronous I/O requests.
|
|
Array members containing
|
|
null pointers will be silently ignored.
|
|
.Pp
|
|
If
|
|
.Fa timeout
|
|
is not a null pointer, it specifies a maximum interval to suspend.
|
|
If
|
|
.Fa timeout
|
|
is a null pointer, the suspend blocks indefinitely.
|
|
To effect a
|
|
poll, the
|
|
.Fa timeout
|
|
should point to a zero-value timespec structure.
|
|
.Sh RETURN VALUES
|
|
If one or more of the specified asynchronous I/O requests have
|
|
completed,
|
|
.Fn aio_suspend
|
|
returns 0.
|
|
Otherwise it returns -1 and sets
|
|
.Va errno
|
|
to indicate the error, as enumerated below.
|
|
.Sh ERRORS
|
|
The
|
|
.Fn aio_suspend
|
|
system call will fail if:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EAGAIN
|
|
the
|
|
.Fa timeout
|
|
expired before any I/O requests completed.
|
|
.It Bq Er EINVAL
|
|
The
|
|
.Fa iocbs
|
|
argument
|
|
contains more asynchronous I/O requests than the
|
|
.Va vfs.aio.max_aio_queue_per_proc
|
|
.Xr sysctl 8
|
|
variable, or at least one of the requests is not valid.
|
|
.It Bq Er EINTR
|
|
the suspend was interrupted by a signal.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr aio_cancel 2 ,
|
|
.Xr aio_error 2 ,
|
|
.Xr aio_return 2 ,
|
|
.Xr aio_waitcomplete 2 ,
|
|
.Xr aio_write 2 ,
|
|
.Xr aio 4
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn aio_suspend
|
|
system call
|
|
is expected to conform to the
|
|
.St -p1003.1
|
|
standard.
|
|
.Sh HISTORY
|
|
The
|
|
.Fn aio_suspend
|
|
system call first appeared in
|
|
.Fx 3.0 .
|
|
.Sh AUTHORS
|
|
This
|
|
manual page was written by
|
|
.An Wes Peters Aq Mt wes@softweyr.com .
|