MSYNC(2) MSYNC(2)
NAME
msync - synchronize a mapped region
SYNOPSIS
msync(addr, len)
caddrt addr;
int len;
DESCRIPTION
The msync system call writes any modified pages back to
the filesystem and updates the file modification time. If
len is 0, all modified pages within the region containing
addr will be flushed; if len is non-zero, only the pages
containing addr and len succeeding locations will be exam-
ined. 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 unpre-
dictable except after an msync.
SEE ALSO
msync.2, munmap.2, mprotect.2, madvise.2, mincore.2
May 27, 1991 1