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Diffstat (limited to 'lib/libc/sys/msync.2')
-rw-r--r-- | lib/libc/sys/msync.2 | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/lib/libc/sys/msync.2 b/lib/libc/sys/msync.2 new file mode 100644 index 0000000..2583c15 --- /dev/null +++ b/lib/libc/sys/msync.2 @@ -0,0 +1,73 @@ +.\" Copyright (c) 1991, 1993 +.\" The Regents of the University of California. 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. +.\" 3. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed by the University of +.\" California, Berkeley and its contributors. +.\" 4. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. +.\" +.\" @(#)msync.2 8.1 (Berkeley) 6/9/93 +.\" +.Dd June 9, 1993 +.Dt MSYNC 2 +.Os +.Sh NAME +.Nm msync +.Nd synchronize a mapped region +.Sh SYNOPSIS +.Fn msync "caddr_t addr" "int len" +.Sh DESCRIPTION +The +.Fn msync +system call +writes any modified pages back to the filesystem and updates +the file modification time. +If +.Fa len +is 0, all modified pages within the region containing +.Fa addr +will be flushed; +if +.Fa len +is non-zero, only the pages containing +.Fa addr +and +.Fa len +succeeding locations will be examined. +Any required synchronization of memory caches +will also take place at this time. +Filesystem operations on a file that is mapped for shared modifications +are unpredictable except after an +.Fn msync . +.Sh SEE ALSO +.Xr madvise 2 , +.Xr munmap 2 , +.Xr mprotect 2 , +.Xr mincore 2 +.Sh HISTORY +The +.Fn msync +function first appeared in 4.4BSD. |