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NetBSD 6.1.5 - man page for msync (netbsd section 2)

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MSYNC(2)			     BSD System Calls Manual				 MSYNC(2)

     msync -- synchronize a mapped region

     Standard C Library (libc, -lc)

     #include <sys/mman.h>

     msync(void *addr, size_t len, int flags);

     The msync() system call writes all pages with shared modifications in the specified region
     of the process's address space back to permanent storage, and, if requested, invalidates
     cached data mapped in the region.	If len is 0, all modified pages within the region con-
     taining addr will be flushed; if len is non-zero, only modified pages containing addr and
     len succeeding locations will be flushed.	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().

     The flags argument is formed by or'ing the following values

	   MS_ASYNC	    Perform asynchronous writes.
	   MS_SYNC	    Perform synchronous writes.
	   MS_INVALIDATE    Invalidate cached data after writing.

     Upon successful completion, a value of 0 is returned.  Otherwise, a value of -1 is returned
     and errno is set to indicate the error.

     The following errors may be reported:

     [EBUSY]		The MS_INVALIDATE flag was specified and a portion of the specified
			region was locked with mlock(2).

     [EINVAL]		The specified flags argument was invalid.

     [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 occurred while writing to the file system.

     [ENOMEM]		Addresses in the specified region are outside the range allowed for the
			address space of the process, or specify one or more pages which are

     mlock(2), mmap(2), munlock(2)

     The msync() function conforms to IEEE Std 1003.1b-1993 (``POSIX.1'')

     The msync() function first appeared in 4.4BSD.  It was modified to conform to IEEE Std
     1003.1b-1993 (``POSIX.1'') in NetBSD 1.3.

BSD					 October 17, 2005				      BSD
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