Manual pages › System calls (2)
sync(2)
update super block
From the original Amiga UNIX 2.1 manual. Some things it mentions may not be in this release.
Also by this name: sync(1), General commands · sync(1M), System administration commands
NAME
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.
It should be used by programs that examine a file system, such as fsck(1M), df(1M), etc. It is mandatory before a re-boot.
The writing, although scheduled, is not necessarily completed before sync returns. The fsync system call completes the writing before it returns.
SEE ALSO
fsync(2)