Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

Man Page or Keyword Search:
Man Architecture
Apropos Keyword Search (all sections) Output format
home | help 
SYNC(2)                   FreeBSD System Calls Manual                  SYNC(2)

NAME
     sync -- schedule filesystem updates

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     void
     sync(void);

DESCRIPTION
     The sync() function 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() call is
     issued frequently by the user process syncer(4) (about every 30 seconds).

     The function fsync(2) may be used to synchronize individual file descrip-
     tor attributes.

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

BUGS
     Sync() may return before the buffers are completely flushed.

HISTORY
     A sync() function call appeared in Version 6 AT&T UNIX.

FreeBSD 4.10                     June 4, 1993                     FreeBSD 4.10
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | SEE ALSO | BUGS | HISTORY

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=sync&sektion=2&manpath=FreeBSD+4.10-RELEASE>

home | help