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SYNC
Section: Linux Programmer's Manual (2)
Updated: 2007-07-26
Index
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NAME
sync - commit buffer cache to disk
SYNOPSIS
#include <unistd.h>
void sync(void);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
sync():
_BSD_SOURCE || _XOPEN_SOURCE >= 500
DESCRIPTION
sync()
first commits inodes to buffers, and then buffers to disk.
ERRORS
This function is always successful.
CONFORMING TO
SVr4, 4.3BSD, POSIX.1-2001.
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
it was "int sync(void)", and
sync()
always returned 0.
BUGS
According to the standard specification (e.g., POSIX.1-2001),
sync()
schedules the writes, but may return before the actual
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.)
SEE ALSO
bdflush(2),
fdatasync(2),
fsync(2),
sync(8),
update(8)
COLOPHON
This page is part of release 3.05 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- ERRORS
-
- CONFORMING TO
-
- NOTES
-
- BUGS
-
- SEE ALSO
-
- COLOPHON
-
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