Section: Linux Programmer's Manual (2)
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sync - commit buffer cache to disk
Feature Test Macro Requirements for glibc (see
_BSD_SOURCE || _XOPEN_SOURCE >= 500 ||
_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
first commits inodes to buffers, and then buffers to disk.
This function is always successful.
SVr4, 4.3BSD, POSIX.1-2001.
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
always returned 0.
According to the standard specification (e.g., POSIX.1-2001),
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
This page is part of release 3.27 of the Linux
A description of the project,
and information about reporting bugs,
can be found at
- CONFORMING TO
- SEE ALSO
This document was created by
using the manual pages.
Time: 19:49:19 GMT, April 27, 2011