添加appspawnw文档

Signed-off-by: Nxlei1030 <xionglei6@huawei.com>

zh-cn/device-dev/subsystems/subsys-boot-appspawn-standard.md

+# appspawn标准系统应用孵化组件<a name="ZH-CN_TOPIC_0000001063680582"></a>
+
+- [概述](#section56901555910)
+  - [功能简介](#section56901555911)
+  - [基本概念](#section56901555912)
+- [开发指导](#section56901555913)
+  - [接口说明](#section56901555914)
+  - [开发实例](#section56901555915)
+- [常见问题](#section56901555916)
+  -  [冷启动失败](#section56901555917)
+
+## 概述<a name="section56901555910"></a>
+
+appspawn被init启动后，等待接收进程间消息，根据消息内容启动应用服务并赋予其对应权限。
+
+### 功能简介<a name="section56901555911"></a>
+
+- 安全控制
+  - 支持为app设置SELinux标签
+
+- 应用进程控制
+
+  - 支持为app设置AccessToken
+  - 支持重启前，appspawn停止后，可同时停止所有已孵化的app进程
+
+- 冷启动
+  - 支持应用通过aa命令冷启动应用
+
+  ```
+  param set appspawn.cold.boot true // 打开冷启动状态
+  aa start -d 12345 -a $name -b $package -C 
+  参考：
+  aa start -d 12345 -a ohos.acts.startup.sysparam.function.MainAbility -b ohos.acts.startup.sysparam.function -C  
+ 
+### 基本概念<a name="section56901555912"></a>
+
+appspawn注册的服务名称为“appspawn”, appspawn 通过监听本地socket，接收来自客户端的请求消息，消息格式定义如下：
+
+**表 1**  字段说明
+
+<table><thead align="left"><tr id="row6650142913713"><th class="cellrowborder" valign="top" width="39.489999999999995%" id="mcps1.2.3.1.1"><p id="p17650112914379"><a name="p17650112914379"></a><a name="p17650112914379"></a>字段名</p>
+</th>
+<th class="cellrowborder" valign="top" width="60.51%" id="mcps1.2.3.1.2"><p id="p865032916376"><a name="p865032916376"></a><a name="p865032916376"></a>说明</p>
+</th>
+</tr>
+</thead>
+<tbody><tr id="row36506298373"><td class="cellrowborder" valign="top" width="39.489999999999995%" headers="mcps1.2.3.1.1 "><p id="p76501029113715"><a name="p76501029113715"></a><a name="p76501029113715"></a>processName</p>
+</td>
+<td class="cellrowborder" valign="top" width="60.51%" headers="mcps1.2.3.1.2 "><p id="p2650329183715"><a name="p2650329183715"></a><a name="p2650329183715"></a>即将启动的应用服务进程名，最大256字节。</p>
+</td>
+</tr>
+<tr id="row36506298373"><td class="cellrowborder" valign="top" width="39.489999999999995%" headers="mcps1.2.3.1.1 "><p id="p76501029113715"><a name="p76501029113715"></a><a name="p76501029113715"></a>bundleName</p>
+</td>
+<td class="cellrowborder" valign="top" width="60.51%" headers="mcps1.2.3.1.2 "><p id="p2650329183715"><a name="p2650329183715"></a><a name="p2650329183715"></a>即将启动的应用程序包名，最大256字节。</p>
+</td>
+</tr>
+<tr id="row86501129183712"><td class="cellrowborder" valign="top" width="39.489999999999995%" headers="mcps1.2.3.1.1 "><p id="p2065010298379"><a name="p2065010298379"></a><a name="p2065010298379"></a>soPath</p>
+</td>
+<td class="cellrowborder" valign="top" width="60.51%" headers="mcps1.2.3.1.2 "><p id="p13650192963715"><a name="p13650192963715"></a><a name="p13650192963715"></a>应用程序指定的动态库的路径，最大256字节。</p>
+</td>
+</tr>
+<tr id="row13650329103719"><td class="cellrowborder" valign="top" width="39.489999999999995%" headers="mcps1.2.3.1.1 "><p id="p16501292377"><a name="p16501292377"></a><a name="p16501292377"></a>uid</p>
+</td>
+<td class="cellrowborder" valign="top" width="60.51%" headers="mcps1.2.3.1.2 "><p id="p186503291371"><a name="p186503291371"></a><a name="p186503291371"></a>即将启动的应用进程的uid，必须为正值。</p>
+</td>
+</tr>
+<tr id="row187625816314"><td class="cellrowborder" valign="top" width="39.489999999999995%" headers="mcps1.2.3.1.1 "><p id="p188771758833"><a name="p188771758833"></a><a name="p188771758833"></a>gid</p>
+</td>
+<td class="cellrowborder" valign="top" width="60.51%" headers="mcps1.2.3.1.2 "><p id="p187716587310"><a name="p187716587310"></a><a name="p187716587310"></a>即将启动的应用进程的gid，必须为正值。</p>
+</td>
+</tr>
+<tr id="row187625816314"><td class="cellrowborder" valign="top" width="39.489999999999995%" headers="mcps1.2.3.1.1 "><p id="p188771758833"><a name="p188771758833"></a><a name="p188771758833"></a>gidTable</p>
+</td>
+<td class="cellrowborder" valign="top" width="60.51%" headers="mcps1.2.3.1.2 "><p id="p187716587310"><a name="p187716587310"></a><a name="p187716587310"></a>即将启动的应用进程组信息，长度由gidCount指定，最大支持64个进程组，必须为正值。</p>
+</td>
+</tr>
+<tr id="row187625816314"><td class="cellrowborder" valign="top" width="39.489999999999995%" headers="mcps1.2.3.1.1 "><p id="p188771758833"><a name="p188771758833"></a><a name="p188771758833"></a>gidCount</p>
+</td>
+<td class="cellrowborder" valign="top" width="60.51%" headers="mcps1.2.3.1.2 "><p id="p187716587310"><a name="p187716587310"></a><a name="p187716587310"></a>即将启动的应用进程组个数。</p>
+</td>
+</tr>
+<tr id="row106508294373"><td class="cellrowborder" valign="top" width="39.489999999999995%" headers="mcps1.2.3.1.1 "><p id="p16501829183715"><a name="p16501829183715"></a><a name="p16501829183715"></a>accessTokenId</p>
+</td>
+<td class="cellrowborder" valign="top" width="60.51%" headers="mcps1.2.3.1.2 "><p id="p11650182953717"><a name="p11650182953717"></a><a name="p11650182953717"></a>应用进程权限控制的token id。</p>
+</td>
+</tr>
+<tr id="row106508294373"><td class="cellrowborder" valign="top" width="39.489999999999995%" headers="mcps1.2.3.1.1 "><p id="p16501829183715"><a name="p16501829183715"></a><a name="p16501829183715"></a>apl</p>
+</td>
+<td class="cellrowborder" valign="top" width="60.51%" headers="mcps1.2.3.1.2 "><p id="p11650182953717"><a name="p11650182953717"></a><a name="p11650182953717"></a>应用进程权限控制的apl，最大32字节。</p>
+</td>
+</tr>
+</tbody>
+</table>
+
+## 开发指导<a name="section56901555913"></a>
+
+  通过 “base/startup/appspawn_standard/interfaces/innerkits/include/client_socket.h“ 头文件查看
+
+### 接口说明<a name="section56901555914"></a>
+
+**表 2**  字段说明
+<table><thead align="left"><tr id="row6650142913713"><th class="cellrowborder" valign="top" width="39.489999999999995%" id="mcps1.2.3.1.1"><p id="p17650112914379"><a name="p17650112914379"></a><a name="p17650112914379"></a>字段名</p>
+</th>
+<th class="cellrowborder" valign="top" width="60.51%" id="mcps1.2.3.1.2"><p id="p865032916376"><a name="p865032916376"></a><a name="p865032916376"></a>说明</p>
+</th>
+</tr>
+</thead>
+<tbody><tr id="row36506298373"><td class="cellrowborder" valign="top" width="39.489999999999995%" headers="mcps1.2.3.1.1 "><p id="p76501029113715"><a name="p76501029113715"></a><a name="p76501029113715"></a>CreateClient</p>
+</td>
+<td class="cellrowborder" valign="top" width="60.51%" headers="mcps1.2.3.1.2 "><p id="p2650329183715"><a name="p2650329183715"></a><a name="p2650329183715"></a>创建client。</p>
+</td>
+</tr>
+<tr id="row36506298373"><td class="cellrowborder" valign="top" width="39.489999999999995%" headers="mcps1.2.3.1.1 "><p id="p76501029113715"><a name="p76501029113715"></a><a name="p76501029113715"></a>CloseClient</p>
+</td>
+<td class="cellrowborder" valign="top" width="60.51%" headers="mcps1.2.3.1.2 "><p id="p2650329183715"><a name="p2650329183715"></a><a name="p2650329183715"></a>关闭client。</p>
+</td>
+</tr>
+<tr id="row86501129183712"><td class="cellrowborder" valign="top" width="39.489999999999995%" headers="mcps1.2.3.1.1 "><p id="p2065010298379"><a name="p2065010298379"></a><a name="p2065010298379"></a>ConnectSocket</p>
+</td>
+<td class="cellrowborder" valign="top" width="60.51%" headers="mcps1.2.3.1.2 "><p id="p13650192963715"><a name="p13650192963715"></a><a name="p13650192963715"></a>向appspawn服务发起连接请求。</p>
+</td>
+</tr>
+<tr id="row13650329103719"><td class="cellrowborder" valign="top" width="39.489999999999995%" headers="mcps1.2.3.1.1 "><p id="p16501292377"><a name="p16501292377"></a><a name="p16501292377"></a>WriteSocketMessage</p>
+</td>
+<td class="cellrowborder" valign="top" width="60.51%" headers="mcps1.2.3.1.2 "><p id="p186503291371"><a name="p186503291371"></a><a name="p186503291371"></a>发送消息到appspawn服务。</p>
+</td>
+</tr>
+<tr id="row187625816314"><td class="cellrowborder" valign="top" width="39.489999999999995%" headers="mcps1.2.3.1.1 "><p id="p188771758833"><a name="p188771758833"></a><a name="p188771758833"></a>ReadSocketMessage</p>
+</td>
+<td class="cellrowborder" valign="top" width="60.51%" headers="mcps1.2.3.1.2 "><p id="p187716587310"><a name="p187716587310"></a><a name="p187716587310"></a>接收来自appspawn服务的消息。</p>
+</td>
+</tr>
+</tbody>
+</table>
+
+### 开发实例<a name="section56901555915"></a>
+
+```
+    std::shared_ptr<AppSpawn::ClientSocket> clientSocket = std::make_unique<AppSpawn::ClientSocket>("AppSpawn");
+    if (clientSocket == nullptr) {
+        return -1;
+    }
+    if (clientSocket->CreateClient() != ERR_OK) {
+        return -1;
+    }
+    if (clientSocket->ConnectSocket() != ERR_OK) {
+        return -1;;
+    }
+    // property 构造AppProperty
+    clientSocket->WriteSocketMessage((void *)&property, sizeof(AppSpawn::AppProperty));
+    // 读结果
+    int pid;
+    clientSocket->ReadSocketMessage((void *)&pid, sizeof(pid));
+    // 如果失败，返回pid如果小于等于0，则错误，否则返回应用的进程id
+```
+
+## 常见问题<a name="section56901555916"></a>
+
+### 冷启动失败<a name="section56901555917"></a>
+
+-   **现象描述**
+     通过命令冷启动应用失败
+
+-   **解决方法**
+     1. 确认是否打开冷启动设置
+     2. 确认冷启动命令是否正确
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