| SYNC(2) | System Calls Manual | SYNC(2) |
sync — schedule
file system updates
Standard C Library (libc, -lc)
#include
<unistd.h>
void
sync(void);
The
sync()
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.
The sync() function appeared in
Version 3 AT&T UNIX.
The sync() system call may return before
the buffers are completely flushed.
| December 1, 2017 | Debian |