tools: acrn-crashlog: add APIs for client and debugger

This patch is the initial patch for some APIs for client and debugger.

Usercrash works as C/S model. The usercrash_c runs as the client of
usercrash. File crash_dump.c provides the APIs for client and
debugger to dump some crash information.

Signed-off-by: xiaojin2 <xiaojing.liu@intel.com>
Reviewed-by: Zhang Yanmin <yanmin.zhang@intel.com>
Reviewed-by: Liu Chuansheng <chuansheng.liu@intel.com>
Reviewed-by: Zhao Yakui <yakui.zhao@intel.com>
Reviewed-by: Geoffroy Van Cutsem <geoffroy.vancutsem@intel.com>
Acked-by: Eddie Dong <Eddie.dong@intel.com>

tools/acrn-crashlog/usercrash/include/packet.h

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) <2018> Intel Corporation
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef CLIENT_H
+#define CLIENT_H
+
+#define COMM_NAME_LEN 64
+#define SOCKET_NAME "user_crash"
+
+#include <stdio.h>
+#include <stdbool.h>
+
+enum CrashPacketType {
+	/* Initial request from crash_dump */
+	kDumpRequest = 0,
+
+	/* Notification of a completed crash dump */
+	kCompletedDump,
+
+	/* Responses to kRequest */
+	kPerformDump
+};
+
+struct crash_packet {
+	enum CrashPacketType packet_type;
+	int pid;
+	char name[COMM_NAME_LEN];
+};
+
+#endif