mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-27 11:55:06 +00:00
134 lines
3.9 KiB
Groff
134 lines
3.9 KiB
Groff
.\" Copyright (c) 2013 Gleb Smirnoff <glebius@FreeBSD.org>
|
|
.\" 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 June 3, 2013
|
|
.Dt AIO_MLOCK 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm aio_mlock
|
|
.Nd asynchronous
|
|
.Xr mlock 2
|
|
operation
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In aio.h
|
|
.Ft int
|
|
.Fn aio_mlock "struct aiocb *iocb"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn aio_mlock
|
|
system call allows the calling process to lock into memory the
|
|
physical pages associated with the virtual address range starting at
|
|
.Fa iocb->aio_buf
|
|
for
|
|
.Fa iocb->aio_nbytes
|
|
bytes.
|
|
The call returns immediately after the locking request has
|
|
been enqueued; the operation may or may not have completed at the time
|
|
the call returns.
|
|
.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
|
|
.Xr aio 4
|
|
limits),
|
|
then the call returns without having enqueued the request.
|
|
.Sh RESTRICTIONS
|
|
The Asynchronous I/O Control Block structure pointed to by
|
|
.Fa iocb
|
|
and the buffer that the
|
|
.Fa iocb->aio_buf
|
|
member of that structure references must remain valid until the
|
|
operation has completed.
|
|
For this reason, use of auto (stack) variables
|
|
for these objects is discouraged.
|
|
.Pp
|
|
The asynchronous I/O control buffer
|
|
.Fa iocb
|
|
should be zeroed before the
|
|
.Fn aio_mlock
|
|
call to avoid passing bogus context information to the kernel.
|
|
.Pp
|
|
Modifications of the Asynchronous I/O Control Block structure or the
|
|
buffer contents after the request has been enqueued, but before the
|
|
request has completed, are not allowed.
|
|
.Sh RETURN VALUES
|
|
.Rv -std aio_mlock
|
|
.Sh ERRORS
|
|
The
|
|
.Fn aio_mlock
|
|
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_mlock
|
|
system call is not supported.
|
|
.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 mlock 2
|
|
system call, and the value returned by the
|
|
.Fn aio_error
|
|
system call is one of the error returns from the
|
|
.Xr mlock 2
|
|
system call, or
|
|
.Er ECANCELED
|
|
if the request was explicitly cancelled via a call to
|
|
.Fn aio_cancel .
|
|
.Sh SEE ALSO
|
|
.Xr aio_cancel 2 ,
|
|
.Xr aio_error 2 ,
|
|
.Xr aio_return 2 ,
|
|
.Xr mlock 2 ,
|
|
.Xr aio 4
|
|
.Sh PORTABILITY
|
|
The
|
|
.Fn aio_mlock
|
|
system call is a
|
|
.Fx
|
|
extension, and should not be used in portable code.
|
|
.Sh HISTORY
|
|
The
|
|
.Fn aio_mlock
|
|
system call first appeared in
|
|
.Fx 10.0 .
|
|
.Sh AUTHORS
|
|
The system call was introduced by
|
|
.An Gleb Smirnoff Aq Mt glebius@FreeBSD.org .
|