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| -rw-r--r-- | bin/sync/sync.8 | 72 | ||||
| -rw-r--r-- | bin/sync/sync.c | 43 |
2 files changed, 115 insertions, 0 deletions
diff --git a/bin/sync/sync.8 b/bin/sync/sync.8 new file mode 100644 index 0000000..d3ca6d8 --- /dev/null +++ b/bin/sync/sync.8 @@ -0,0 +1,72 @@ +.\" $NetBSD: sync.8,v 1.16 2016/08/12 02:59:23 sevan Exp $ +.\" +.\" Copyright (c) 1980, 1991, 1993 +.\" The Regents of the University of California. All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 3. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" @(#)sync.8 8.1 (Berkeley) 5/31/93 +.\" +.Dd August 12, 2016 +.Dt SYNC 8 +.Os +.Sh NAME +.Nm sync +.Nd force completion of pending disk writes (flush cache) +.Sh SYNOPSIS +.Nm +.Sh DESCRIPTION +The +.Nm +program can be called to ensure that all disk writes have been +completed before the processor is halted in a way not suitably done by +.Xr reboot 8 +or +.Xr halt 8 . +Generally, it is preferable to use +.Xr reboot 8 +or +.Xr halt 8 +to shut down the system, +as they may perform additional actions +such as resynchronizing the hardware clock +and flushing internal caches before performing a final +.Nm . +.Pp +The +.Nm +program simply invokes the +.Xr sync 2 +system call. +.Sh SEE ALSO +.Xr fsync 2 , +.Xr sync 2 , +.Xr halt 8 , +.Xr reboot 8 +.Sh HISTORY +A +.Nm +command appeared in +.At v4 . diff --git a/bin/sync/sync.c b/bin/sync/sync.c new file mode 100644 index 0000000..9645ad3 --- /dev/null +++ b/bin/sync/sync.c @@ -0,0 +1,43 @@ +/* $NetBSD: sync.c,v 1.14 2016/09/05 01:00:07 sevan Exp $ */ + +/* + * Copyright (c) 1987, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <bsd/stdlib.h> +#include <unistd.h> + +/* ARGSUSED */ +int +main(int argc, char *argv[]) +{ + setprogname(argv[0]); + sync(); + exit(0); + /* NOTREACHED */ +} |