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28 .\" @(#)msync.2 8.2 (Berkeley) 6/21/94
29 .\" $FreeBSD: src/lib/libc/sys/msync.2,v 1.16.2.5 2001/12/14 18:34:01 ru Exp $
36 .Nd synchronize a mapped region
43 .Fn msync "void *addr" "size_t len" "int flags"
48 writes any modified pages back to the filesystem and updates
49 the file modification time.
52 is 0, all modified pages within the region containing
57 is non-zero, only those pages containing
61 succeeding locations will be examined.
64 argument may be specified as follows:
65 .Bl -tag -width ".Dv MS_INVALIDATE"
69 Perform synchronous writes
71 Invalidate all cached data
81 is not a multiple of the hardware page size.
84 is too large or negative.
91 Only one of these flags is allowed.
93 An I/O error occurred while writing to the file system.
103 function first appeared in