sync.tproj/sync.8

   1 .\" Copyright (c) 1980, 1991, 1993
   2 .\"     The Regents of the University of California.  All rights reserved.
   3 .\"
   4 .\" Redistribution and use in source and binary forms, with or without
   5 .\" modification, are permitted provided that the following conditions
   6 .\" are met:
   7 .\" 1. Redistributions of source code must retain the above copyright
   8 .\"    notice, this list of conditions and the following disclaimer.
   9 .\" 2. Redistributions in binary form must reproduce the above copyright
  10 .\"    notice, this list of conditions and the following disclaimer in the
  11 .\"    documentation and/or other materials provided with the distribution.
  12 .\" 3. All advertising materials mentioning features or use of this software
  13 .\"    must display the following acknowledgement:
  14 .\"     This product includes software developed by the University of
  15 .\"     California, Berkeley and its contributors.
  16 .\" 4. Neither the name of the University nor the names of its contributors
  17 .\"    may be used to endorse or promote products derived from this software
  18 .\"    without specific prior written permission.
  19 .\"
  20 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23 .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30 .\" SUCH DAMAGE.
  31 .\"
  32 .\"     @(#)sync.8      8.1 (Berkeley) 5/31/93
  33 .\"
  34 .Dd May 31, 1993
  35 .Dt SYNC 8
  36 .Os BSD 4
  37 .Sh NAME
  38 .Nm sync
  39 .Nd force completion of pending disk writes (flush cache)
  40 .Sh SYNOPSIS
  41 .Nm sync
  42 .Sh DESCRIPTION
  43 .Nm Sync
  44 can be called to insure that all disk writes have been completed before the
  45 processor is halted in a way not suitably done by
  46 .Xr reboot 8
  47 or
  48 .Xr halt 8 .
  49 Generally, it is preferable to use
  50 .Xr reboot
  51 or
  52 .Xr halt
  53 to shut down the system,
  54 as they may perform additional actions
  55 such as resynchronizing the hardware clock
  56 and flushing internal caches before performing a final
  57 .Nm sync .
  58 .Pp
  59 .Nm Sync
  60 utilizes the
  61 .Xr sync 2
  62 function call.
  63 .Sh SEE ALSO
  64 .Xr sync 2 ,
  65 .Xr fsync 2 ,
  66 .Xr halt 8 ,
  67 .Xr reboot 8 ,
  68 .Xr update 8
  69 .Sh HISTORY
  70 A
  71 .Nm sync
  72 command appeared in
  73 .At v6 .