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MSYNC(2)                    BSD Programmer's Manual                   MSYNC(2)

NAME
     msync - synchronize a mapped region

SYNOPSIS
     msync(caddr_t 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 unpredictable except after an msync().

ERRORS
     The following errors may be reported:

     [EINVAL]      The addr parameter was not page aligned.

     [EINVAL]      The addr parameter did not specify an address part of a
                   mapped region.

     [EINVAL]      The len parameter was negative.

     [EIO]         An I/O error occured while writing to the file system.

SEE ALSO
     madvise(2),  munmap(2),  mprotect(2),  mincore(2)

HISTORY
     The msync() function first appeared in 4.4BSD.

4.4BSD                           June 21, 1994                               1