Initial version of crossystem.

host/include/crossystem.h

+/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef VBOOT_REFERENCE_CROSSYSTEM_H_
+#define VBOOT_REFERENCE_CROSSYSTEM_H_
+
+/* Reads a system property integer.
+ *
+ * Returns the property value, or -1 if error. */
+int VbGetSystemPropertyInt(const char* name);
+
+/* Read a system property string into a destination buffer of the specified
+ * size.

[Bill Richardson, 2011/02/07 18:49:51]

Might also comment that the returned string will be truncated and
null-terminated if the dest is too small.

+ *
+ * Returns the passed buffer, or NULL if error. */
+const char* VbGetSystemPropertyString(const char* name, char* dest, int size);
+
+/* Sets a system property integer.
+ *
+ * Returns 0 if success, -1 if error. */
+int VbSetSystemPropertyInt(const char* name, int value);
+
+/* Set a system property string.
+ *
+ * Returns 0 if success, -1 if error. */
+int VbSetSystemPropertyString(const char* name, const char* value);
+
+#endif  /* VBOOT_REFERENCE__CROSSYSTEM_H_ */