NAME    [Toc]    [Back]

     sync -- schedule file system updates

LIBRARY    [Toc]    [Back]

     Standard C Library (libc, -lc)

SYNOPSIS    [Toc]    [Back]

     #include <unistd.h>

     void
     sync(void);

DESCRIPTION    [Toc]    [Back]

     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 user process syncer(4) (about every 30
     seconds).

     The fsync(2) system call may be used to synchronize individual file
     descriptor attributes.

SEE ALSO    [Toc]    [Back]

     fsync(2), syncer(4), sync(8)

BUGS    [Toc]    [Back]

     The sync() system call may return before the buffers are completely
     flushed.

HISTORY    [Toc]    [Back]

     The sync() function appeared in Version 6 AT&T UNIX.


FreeBSD 5.2.1			 June 4, 1993			 FreeBSD 5.2.1