sync(2)

sync -- update super block

Synopsis

   #include <unistd.h>
   
   void sync(void);

Description

sync causes all information in memory that should be on disk to be written out. This includes modified super blocks, modified i-nodes, and delayed block I/O.

The writing, although scheduled, is not necessarily completed before sync returns. The fsync system call completes the writing before it returns.

Usage

sync should be used by programs that examine a file system, such as fsck(1M), df(1M), and so on. It is mandatory before a re-boot.

References

fsync(2)