On Fri, Jul 22, 2011 at 8:44 AM, Unga <unga...@yahoo.com> wrote: > Hi all > > How to sync a file on FreeBSD (esp. on 8.1) to disk? > > I used fsync(2), but does not immediately flush to disk. > > I want my writing to a file (a log file) immediately available to other users > to read.
It shouldn't matter: as soon as write(2) completes, the system-wide file cache -- not the disk -- is updated, and other users will transparently read(2) from that cache, not from the disk. What you probably want is to flush the userspace buffers of your I/O library as soon as you write a line of output: See fflush(3), set[v]buf(3)... You may also use a non-buffered stream for writing logs. fsync(2) has other uses. In particular, it is of NO use as long as the logging application doesn't flush its I/O caches itself. > Best regards > Unga -cpghost. -- Cordula's Web. http://www.cordula.ws/ _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
