sync.2

<B>Digital的Unix操作系统VAX 4.2源码</B>

.\" SCCSID: @(#)sync.2	8.2	1/28/91
.TH sync 2
.SH Name
sync \- update super-block
.SH Syntax
.B void sync()
.SH Description
.NXR "sync system call"
.NXR "file system" "examining"
The
.PN sync
system call causes all information in 
memory that should be on disk to be written out.
This includes modified superblocks,
modified i-nodes, and delayed block I/O.
.PP
Programs that examine a file system,
for example,
.PN "fsck"
or
.PN "df,"
use the 
.PN sync
system call.
The writing, although scheduled, is not necessarily
complete upon return from 
.PN sync .
.SH See Also
sync(1), fsync(2), update(8)