Imported Upstream version 93u+upstream

1 files changed, 79 insertions, 0 deletions

diff --git a/src/lib/libcmd/sync.c b/src/lib/libcmd/sync.c
new file mode 100644
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+/***********************************************************************
+*                                                                      *
+*               This software is part of the ast package               *
+*          Copyright (c) 1992-2012 AT&T Intellectual Property          *
+*                      and is licensed under the                       *
+*                 Eclipse Public License, Version 1.0                  *
+*                    by AT&T Intellectual Property                     *
+*                                                                      *
+*                A copy of the License is available at                 *
+*          http://www.eclipse.org/org/documents/epl-v10.html           *
+*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
+*                                                                      *
+*              Information and Software Systems Research               *
+*                            AT&T Research                             *
+*                           Florham Park NJ                            *
+*                                                                      *
+*                 Glenn Fowler <gsf@research.att.com>                  *
+*                  David Korn <dgk@research.att.com>                   *
+*                                                                      *
+***********************************************************************/
+#pragma prototyped
+/*
+ * David Korn
+ * Glenn Fowler
+ * AT&T Research
+ */
+
+static const char usage[] =
+"[-?\n@(#)$Id: sync (AT&T Research) 2006-10-04 $\n]"
+USAGE_LICENSE
+"[+NAME?sync - schedule file system updates]"
+"[+DESCRIPTION?\bsync\b calls \bsync\b(2), which causes all information "
+    "in memory that updates file systems to be scheduled for writing out to "
+    "all file systems. The writing, although scheduled, is not necessarily "
+    "complete upon return from \bsync\b.]"
+"[+?Since \bsync\b(2) has no failure indication, \bsync\b only fails for "
+    "option/operand syntax errors, or when \bsync\b(2) does not return, in "
+    "which case \bsync\b also does not return.]"
+"[+?At minimum \bsync\b should be called before halting the system. Most "
+    "systems provide graceful shutdown procedures that include \bsync\b -- "
+    "use them if possible.]"
+"[+EXIT STATUS?]"
+    "{"
+        "[+0?\bsync\b(2) returned.]"
+        "[+>0?Option/operand syntax error.]"
+    "}"
+"[+SEE ALSO?\bsync\b(2), \bshutdown\b(8)]"
+;
+
+#include <cmd.h>
+#include <ls.h>
+
+int
+b_sync(int argc, char** argv, Shbltin_t* context)
+{
+	cmdinit(argc, argv, context, ERROR_CATALOG, 0);
+	for (;;)
+	{
+		switch (optget(argv, usage))
+		{
+		case ':':
+			error(2, "%s", opt_info.arg);
+			break;
+		case '?':
+			error(ERROR_usage(2), "%s", opt_info.arg);
+			break;
+		}
+		break;
+	}
+	argv += opt_info.index;
+	if (error_info.errors || *argv)
+		error(ERROR_usage(2), "%s", optusage(NiL));
+#if _lib_sync
+	sync();
+#else
+	error(ERROR_usage(2), "failed -- the native system does not provide a sync(2) call");
+#endif
+	return 0;
+}