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 function completes the writing before it returns. 

SEE ALSO

df(1M), fsck(1M), fsync(3C)

SunOS 5.4  —  Last change: 5 Jul 1990