SYNC

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
CONFORMING TO
BUGS
SEE ALSO

NAME

sync − commit buffer cache to disk.

SYNOPSIS

#include <unistd.h>

int sync(void);

DESCRIPTION

sync first commits inodes to buffers, and then buffers to disk.

RETURN VALUE

sync always returns 0.

CONFORMING TO

SVr4, SVID, X/OPEN, BSD 4.3

BUGS

According to the standard specification (e.g., SVID), 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), fsync(2), fdatasync(2), update(8), sync(8)