Adding upstream version 1:4.17.4.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

lib/lockpw.c

@@ -0,0 +1,85 @@
+/*
+ * SPDX-FileCopyrightText: 1992       , Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2005       , Tomasz Kłoczko
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ifndef HAVE_LCKPWDF
+
+#ident "$Id$"
+
+#include "prototypes.h"
+#include "defines.h"
+#include "pwio.h"
+#include "shadowio.h"
+/*
+ * lckpwdf - lock the password files
+ */
+int lckpwdf (void)
+{
+	int i;
+
+	/*
+	 * We have 15 seconds to lock the whole mess
+	 */
+
+	for (i = 0; i < 15; i++)
+		if (pw_lock ())
+			break;
+		else
+			sleep (1);
+
+	/*
+	 * Did we run out of time?
+	 */
+
+	if (i == 15)
+		return -1;
+
+	/*
+	 * Nope, use any remaining time to lock the shadow password
+	 * file.
+	 */
+
+	for (; i < 15; i++)
+		if (spw_lock ())
+			break;
+		else
+			sleep (1);
+
+	/*
+	 * Out of time yet?
+	 */
+
+	if (i == 15) {
+		pw_unlock ();
+		return -1;
+	}
+
+	/*
+	 * Nope - and both files are now locked.
+	 */
+
+	return 0;
+}
+
+/*
+ * ulckpwdf - unlock the password files
+ */
+
+int ulckpwdf (void)
+{
+
+	/*
+	 * Unlock both files.
+	 */
+
+	return (pw_unlock () && spw_unlock ())? 0 : -1;
+}
+#else
+extern int ISO_C_forbids_an_empty_translation_unit;
+#endif