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author | rgrimes <rgrimes@FreeBSD.org> | 1994-05-27 05:00:24 +0000 |
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committer | rgrimes <rgrimes@FreeBSD.org> | 1994-05-27 05:00:24 +0000 |
commit | be22b15ae2ff8d7fe06b6e14fddf0c5b444a95da (patch) | |
tree | a18a706dffa5baf86a3b12bbfb4f81caa097f349 /lib/libc/sys/sync.2 | |
parent | 2a27bd86e6002c871e3b5561a5334653bb222a77 (diff) | |
download | FreeBSD-src-be22b15ae2ff8d7fe06b6e14fddf0c5b444a95da.zip FreeBSD-src-be22b15ae2ff8d7fe06b6e14fddf0c5b444a95da.tar.gz |
BSD 4.4 Lite Lib Sources
Diffstat (limited to 'lib/libc/sys/sync.2')
-rw-r--r-- | lib/libc/sys/sync.2 | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/lib/libc/sys/sync.2 b/lib/libc/sys/sync.2 new file mode 100644 index 0000000..5e79fef --- /dev/null +++ b/lib/libc/sys/sync.2 @@ -0,0 +1,73 @@ +.\" 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. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed by the University of +.\" California, Berkeley and its contributors. +.\" 4. 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.2 8.1 (Berkeley) 6/4/93 +.\" +.Dd June 4, 1993 +.Dt SYNC 2 +.Os BSD 4 +.Sh NAME +.Nm sync +.Nd "synchronize disk block in-core status with that on disk" +.Sh SYNOPSIS +.Fd #include <unistd.h> +.Ft void +.Fn sync void +.Sh DESCRIPTION +The +.Fn 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 +.Fn sync +call is issued +frequently +by the user process +.Xr update 8 +(about every 30 seconds). +.Pp +The function +.Xr fsync 2 +may be used to synchronize individual file descriptor +attributes. +.Sh SEE ALSO +.Xr fsync 2 , +.Xr sync 8 , +.Xr update 8 +.Sh BUGS +.Fn Sync +may return before the buffers are completely flushed. +.Sh HISTORY +A +.Nm +function call appeared in Version 6 AT&T UNIX. |