2004-11-03 13:51:07 +00:00
|
|
|
.\" Hey Emacs! This file is -*- nroff -*- source.
|
|
|
|
.\"
|
|
|
|
.\" Copyright (c) 1992 Drew Eckhardt (drew@cs.colorado.edu), March 28, 1992
|
|
|
|
.\"
|
|
|
|
.\" Permission is granted to make and distribute verbatim copies of this
|
|
|
|
.\" manual provided the copyright notice and this permission notice are
|
|
|
|
.\" preserved on all copies.
|
|
|
|
.\"
|
|
|
|
.\" Permission is granted to copy and distribute modified versions of this
|
|
|
|
.\" manual under the conditions for verbatim copying, provided that the
|
|
|
|
.\" entire resulting derived work is distributed under the terms of a
|
|
|
|
.\" permission notice identical to this one.
|
|
|
|
.\"
|
|
|
|
.\" Since the Linux kernel and libraries are constantly changing, this
|
|
|
|
.\" manual page may be incorrect or out-of-date. The author(s) assume no
|
|
|
|
.\" responsibility for errors or omissions, or for damages resulting from
|
|
|
|
.\" the use of the information contained herein. The author(s) may not
|
|
|
|
.\" have taken the same level of care in the production of this manual,
|
|
|
|
.\" which is licensed free of charge, as they might when working
|
|
|
|
.\" professionally.
|
|
|
|
.\"
|
|
|
|
.\" Formatted or processed versions of this manual, if unaccompanied by
|
|
|
|
.\" the source, must acknowledge the copyright and authors of this work.
|
|
|
|
.\"
|
|
|
|
.\" Modified by Michael Haardt <michael@moria.de>
|
|
|
|
.\" Modified Sat Jul 24 12:02:47 1993 by Rik Faith <faith@cs.unc.edu>
|
|
|
|
.\" Modified 15 Apr 1995 by Michael Chastain <mec@shell.portal.com>:
|
|
|
|
.\" Added reference to `bdflush(2)'.
|
|
|
|
.\" Modified 960414 by Andries Brouwer <aeb@cwi.nl>:
|
|
|
|
.\" Added the fact that since 1.3.20 sync actually waits.
|
|
|
|
.\" Modified Tue Oct 22 22:27:07 1996 by Eric S. Raymond <esr@thyrsus.com>
|
|
|
|
.\" Modified 2001-10-10 by aeb, following Michael Kerrisk.
|
|
|
|
.\"
|
|
|
|
.TH SYNC 2 2001-10-10 "Linux 2.4" "Linux Programmer's Manual"
|
|
|
|
.SH NAME
|
|
|
|
sync \- commit buffer cache to disk
|
|
|
|
.SH SYNOPSIS
|
|
|
|
.B #include <unistd.h>
|
|
|
|
.sp
|
|
|
|
.B void sync(void);
|
|
|
|
.SH DESCRIPTION
|
2005-10-19 06:54:38 +00:00
|
|
|
.BR sync ()
|
2004-11-03 13:51:07 +00:00
|
|
|
first commits inodes to buffers, and then buffers to disk.
|
|
|
|
.SH ERRORS
|
|
|
|
This function is always successful.
|
|
|
|
.SH "CONFORMING TO"
|
2006-08-03 13:57:17 +00:00
|
|
|
SVr4, 4.3BSD, POSIX.1-2001.
|
2004-11-03 13:51:07 +00:00
|
|
|
.SH BUGS
|
2006-08-03 13:57:17 +00:00
|
|
|
According to the standard specification (e.g., POSIX.1-2001),
|
2005-10-19 07:07:02 +00:00
|
|
|
\fBsync\fP() schedules the writes, but may return before the actual
|
2004-11-03 13:51:07 +00:00
|
|
|
writing is done.
|
|
|
|
However, since version 1.3.20 Linux does actually wait.
|
|
|
|
(This still does not guarantee data integrity: modern disks have
|
|
|
|
large caches.)
|
|
|
|
.SH NOTES
|
|
|
|
Since glibc 2.2.2 the Linux prototype is as listed above,
|
|
|
|
following the various standards. In libc4, libc5, and glibc up to 2.2.1
|
2005-10-20 15:11:10 +00:00
|
|
|
it was "int sync(void)", and
|
|
|
|
.BR sync ()
|
|
|
|
always returned 0.
|
2004-11-03 13:51:07 +00:00
|
|
|
.SH "SEE ALSO"
|
|
|
|
.BR bdflush (2),
|
|
|
|
.BR fdatasync (2),
|
|
|
|
.BR fsync (2),
|
|
|
|
.BR sync (8),
|
|
|
|
.BR update (8)
|