Re: Memory mapped files question

[H. Peter Anvin]

Chris Friesen wrote:
> 
>> munmap() and fsync() or msync() will flush it to disk; there is no reason
>> munmap() should unless perhaps the file was opened O_SYNC.
> 
> Wait a minute.  Shouldn't a file opened O_SYNC flush the writes as they
> happen,
> removing the requirement for any explicit syncing?  If it doesn't there
> are some very broken apps around.
> 

Not for mmap().

	-hpa