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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libcmd/sync.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1992-2012 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                  David Korn <[email protected]>                   *

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*                                                                      *

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***********************************************************************/

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#pragma prototyped

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/*

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 * David Korn

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 * Glenn Fowler

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 * AT&T Research

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 */

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static const char usage[] =

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"[-?\n@(#)$Id: sync (AT&T Research) 2006-10-04 $\n]"

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USAGE_LICENSE

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"[+NAME?sync - schedule file system updates]"

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"[+DESCRIPTION?\bsync\b calls \bsync\b(2), which causes all information "

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    "in memory that updates file systems to be scheduled for writing out to "

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    "all file systems. The writing, although scheduled, is not necessarily "

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    "complete upon return from \bsync\b.]"

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"[+?Since \bsync\b(2) has no failure indication, \bsync\b only fails for "

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    "option/operand syntax errors, or when \bsync\b(2) does not return, in "

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    "which case \bsync\b also does not return.]"

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"[+?At minimum \bsync\b should be called before halting the system. Most "

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    "systems provide graceful shutdown procedures that include \bsync\b -- "

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    "use them if possible.]"

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"[+EXIT STATUS?]"

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    "{"

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        "[+0?\bsync\b(2) returned.]"

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        "[+>0?Option/operand syntax error.]"

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    "}"

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"[+SEE ALSO?\bsync\b(2), \bshutdown\b(8)]"

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;

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#include <cmd.h>

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#include <ls.h>

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int

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b_sync(int argc, char** argv, Shbltin_t* context)

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{

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	cmdinit(argc, argv, context, ERROR_CATALOG, 0);

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	for (;;)

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	{

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		switch (optget(argv, usage))

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		{

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		case ':':

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			error(2, "%s", opt_info.arg);

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			break;

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		case '?':

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			error(ERROR_usage(2), "%s", opt_info.arg);

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			break;

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		}

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		break;

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	}

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	argv += opt_info.index;

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	if (error_info.errors || *argv)

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		error(ERROR_usage(2), "%s", optusage(NiL));

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#if _lib_sync

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	sync();

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#else

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	error(ERROR_usage(2), "failed -- the native system does not provide a sync(2) call");

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#endif

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	return 0;

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}

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