How to sync a file on FreeBSD?

Pieter de Goeje pieter at
Fri Jul 22 12:14:39 UTC 2011

On Friday, July 22, 2011 08:44:00 AM Unga wrote:
> 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.

A file doesn't need to be "synced" to disk for other users to read the latest 
data. The application just needs to call write(2) and the data is available. 
It will be written to and read from the operating system's file cache. If 
you're using stdio you can force a write(2) by calling fflush(3).

- Pieter

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