Name
sync, syncfs — commit filesystem caches to disk
Synopsis
#include <unistd.h>
void
sync( |
void); |
int
syncfs( |
int fd); |
![[Note]](../stylesheet/note.png) |
Note | ||||||
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DESCRIPTION
sync() causes all pending
modifications to file system metadata and cached file data to
be written to the underlying filesystems.
syncfs() is like
sync(), but synchronizes just
the filesystem containing file referred to by the open file
descriptor fd.
RETURN VALUE
syncfs() returns 0 on
success; on error, it returns −1 and sets errno to indicate the error.
ERRORS
sync() is always
successful.
syncfs() can fail for at
least the following reason:
- EBADF
-
fdis not a valid file descriptor.
VERSIONS
syncfs() first appeared in
Linux 2.6.39; library support was added to glibc in version
2.14.
NOTES
Since glibc 2.2.2, the Linux prototype for sync() is as listed above, following the
various standards. In glibc 2.2.1 and earlier, it was "int
sync(void)", and sync() always
returned 0.
According to the standard specification (e.g.,
POSIX.1-2001), sync() schedules
the writes, but may return before the actual writing is done.
However Linux waits for I/O completions, and thus
sync() or syncfs() provide the same guarantees as
fsync called on every file in the system or filesystem
respectively.
COLOPHON
This page is part of release 4.07 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
|
Copyright (c) 1992 Drew Eckhardt (drewcs.colorado.edu), March 28, 1992 and Copyright (c) 2011 Michael Kerrisk <mtk.manpagesgmail.com> %%%LICENSE_START(VERBATIM) 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 Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date.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. %%%LICENSE_END Modified by Michael Haardt <michaelmoria.de> Modified Sat Jul 24 12:02:47 1993 by Rik Faith <faithcs.unc.edu> Modified 15 Apr 1995 by Michael Chastain <mecshell.portal.com>: Added reference to `bdflush(2)'. Modified 960414 by Andries Brouwer <aebcwi.nl>: Added the fact that since 1.3.20 sync actually waits. Modified Tue Oct 22 22:27:07 1996 by Eric S. Raymond <esrthyrsus.com> Modified 2001-10-10 by aeb, following Michael Kerrisk. 2011-09-07, mtk, Added syncfs() documentation, |