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), and so on.  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)