NAME
sync —
schedule file system updates
LIBRARY
library “libc”
SYNOPSIS
#include
<unistd.h>
void
sync(void);
DESCRIPTION
Thesync()
system call forces a write of dirty (modified) buffers in the block buffer
cache out to disk. The kernel keeps this information in core to reduce the
number of disk I/O transfers required by the system. As information in the
cache is lost after a system crash, a sync() system
call is issued frequently by the kernel process
syncer(4) (about every 30 seconds).
The fsync(2) system call may be used to synchronize individual file descriptor attributes.
SEE ALSO
HISTORY
The sync() function appeared in
Version 3 AT&T UNIX.
BUGS
The sync() system call may return before
the buffers are completely flushed.