59 lines
2.6 KiB
Groff
59 lines
2.6 KiB
Groff
.\" Copyright (c) 1991 Regents of the University of California.
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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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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 6.1 (Berkeley) 5/27/91
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.\"
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.TH MSYNC 2 "May 27, 1991"
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.UC 7
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.SH NAME
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msync \- synchronize a mapped region
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.SH SYNOPSIS
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.nf
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msync(addr, len)
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.B caddr_t addr;
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.B int len;
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.fi
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.SH DESCRIPTION
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.PP
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The \fImsync\fP system call
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writes any modified pages back to the filesystem and updates
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the file modification time.
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If \fIlen\fP is 0, all modified pages within the region containing \fIaddr\fP
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will be flushed;
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if \fIlen\fP is non-zero, only the pages containing \fIaddr\fP and \fIlen\fP
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succeeding locations will be examined.
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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 \fImsync\fP.
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.SH "SEE ALSO"
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msync.2, munmap.2, mprotect.2, madvise.2, mincore.2
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