sync man page


This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

sync — schedule file system updates


#include <unistd.h>

void sync(void);


The sync() function shall cause all information in memory that updates file systems to be scheduled for writing out to all file systems.

The writing, although scheduled, is not necessarily complete upon return from sync().

Return Value

The sync() function shall not return a value.


No errors are defined.

The following sections are informative.

See Also


The Base Definitions volume of POSIX.1‐2008, <unistd.h>


2013 IEEE/The Open Group POSIX Programmer's Manual