2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
131 lines
3.8 KiB
Groff
131 lines
3.8 KiB
Groff
.\" $NetBSD: msync.2,v 1.23 2005/10/18 03:18:16 chs Exp $
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.\"
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.\" Copyright (c) 1991, 1993
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.\" The Regents of the University of California. 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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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 THE REGENTS 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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.\" @(#)msync.2 8.2 (Berkeley) 6/21/94
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.\"
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.Dd October 17, 2005
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.Dt MSYNC 2
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.Os
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.Sh NAME
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.Nm msync
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.Nd synchronize a mapped region
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/mman.h
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.Ft int
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.Fn msync "void *addr" "size_t len" "int flags"
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.Sh DESCRIPTION
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The
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.Fn msync
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system call writes all pages with shared modifications
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in the specified
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region of the process's address space back to permanent
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storage, and, if requested, invalidates cached data mapped
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in the region.
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If
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.Fa len
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is 0, all modified pages within the region containing
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.Fa addr
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will be flushed;
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if
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.Fa len
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is non-zero, only modified pages containing
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.Fa addr
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and
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.Fa len
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succeeding locations will be flushed.
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Any required synchronization of memory caches
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will also take place at this time.
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Filesystem operations on a file that is mapped for shared modifications
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are unpredictable except after an
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.Fn msync .
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.Pp
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The
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.Fa flags
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argument is formed by
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.Em or Ns 'ing
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the following values
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.Pp
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.Bl -column -offset indent -compact MS_INVALIDATE
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.It Dv MS_ASYNC Ta Perform asynchronous writes.
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.It Dv MS_SYNC Ta Perform synchronous writes.
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.It Dv MS_INVALIDATE Ta Invalidate cached data after writing.
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.El
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.Sh RETURN VALUES
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Upon successful completion,
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a value of 0 is returned.
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Otherwise, a value of \-1 is returned and
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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The following errors may be reported:
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.Bl -tag -width Er
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.It Bq Er EBUSY
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The
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.Dv MS_INVALIDATE
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flag was specified and a portion of the specified region
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was locked with
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.Xr mlock 2 .
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.It Bq Er EINVAL
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The specified
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.Fa flags
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argument was invalid.
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.It Bq Er EINVAL
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The
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.Fa addr
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parameter was not page aligned.
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.It Bq Er EINVAL
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The
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.Fa addr
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parameter did not specify an address part of a mapped region.
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.It Bq Er EINVAL
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The
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.Fa len
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parameter was negative.
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.It Bq Er EIO
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An I/O error occurred while writing to the file system.
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.It Bq Er ENOMEM
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Addresses in the specified region are outside the range allowed
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for the address space of the process, or specify one or more pages
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which are unmapped.
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.El
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.Sh SEE ALSO
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.Xr mlock 2 ,
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.Xr mmap 2 ,
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.Xr munlock 2
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.Sh HISTORY
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The
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.Fn msync
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function first appeared in
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.Bx 4.4 .
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It was modified to conform to
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.St -p1003.1b-93
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in
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.Nx 1.3 .
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