From dea97174128a992c23df917ec8326343fdf9eef4 Mon Sep 17 00:00:00 2001
From: flykhan <liubo666666@outlook.com>
Date: Thu, 17 Aug 2023 18:18:20 +0800
Subject: [PATCH] =?UTF-8?q?=E7=AE=A1=E9=81=93-=E8=BF=9B=E7=A8=8B=E6=A1=88?=
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MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 day4/chat_tool/chat_tool   | Bin 0 -> 13392 bytes
 day4/chat_tool/chat_tool.c | 130 +++++++++++++++++++++++++++++++++++++
 day4/chat_tool/readme.md   |  53 +++++++++++++++
 3 files changed, 183 insertions(+)
 create mode 100755 day4/chat_tool/chat_tool
 create mode 100644 day4/chat_tool/chat_tool.c
 create mode 100644 day4/chat_tool/readme.md

diff --git a/day4/chat_tool/chat_tool b/day4/chat_tool/chat_tool
new file mode 100755
index 0000000000000000000000000000000000000000..11d962b463c9bfd64409c60e94b07fb2c075bf15
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diff --git a/day4/chat_tool/chat_tool.c b/day4/chat_tool/chat_tool.c
new file mode 100644
index 0000000..950bd50
--- /dev/null
+++ b/day4/chat_tool/chat_tool.c
@@ -0,0 +1,130 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <errno.h>
+#include <string.h>
+
+// 创建FIFO
+int createFifo(const char *fifoName)
+{
+    if (mkfifo(fifoName, 0644) == -1) // 创建FIFO
+    {
+        if (errno != EEXIST)
+        {
+            perror(fifoName); // 输出错误信息
+            return 1;
+        }
+    }
+    return 0;
+}
+
+// 发送数据
+void sendData(const char *fifoName, const char *sender)
+{
+    int fd = open(fifoName, O_WRONLY); // 打开FIFO以进行写操作
+    while (1)
+    {
+        char buf[128] = {};
+        int len = read(STDIN_FILENO, buf, 128); // 从标准输入读取数据
+        buf[len - 1] = '\0';                    // 去除换行符
+        write(fd, buf, len);                    // 写入FIFO
+        if (strcmp(buf, "bye") == 0)            // 如果输入为"bye"，则退出循环
+        {
+            break;
+        }
+    }
+    close(fd);                       // 关闭FIFO
+    printf("%s 发送完毕\n", sender); // 输出发送方的信息
+}
+
+// 接收数据
+void receiveData(const char *fifoName, const char *receiver)
+{
+    int fd = open(fifoName, O_RDONLY); // 打开FIFO以进行读操作
+    while (1)
+    {
+        char buf[128] = "";
+        int len = read(fd, buf, 128); // 从FIFO读取数据
+        if (len <= 0)
+            break;
+        printf("接收 %s: %s\n", receiver, buf); // 输出接收到的数据和接收方的信息
+    }
+    close(fd);                         // 关闭FIFO
+    printf("%s 接收完毕\n", receiver); // 输出接收方的信息
+}
+
+int main(int argc, char const *argv[])
+{
+    const char *fifo_bob_to_lucy = "fifo_bob_to_lucy"; // Bob到Lucy的FIFO名称
+    const char *fifo_lucy_to_bob = "fifo_lucy_to_bob"; // Lucy到Bob的FIFO名称
+
+    // 创建FIFO
+    if (createFifo(fifo_bob_to_lucy) != 0) // 创建Bob到Lucy的FIFO
+        return 1;
+
+    if (createFifo(fifo_lucy_to_bob) != 0) // 创建Lucy到Bob的FIFO
+        return 1;
+
+    if (argc != 2)
+    {
+        printf("Useage: ./chat_tool [角色名: lucy | bob]");
+        return 1;
+    }
+
+    if (strcmp(argv[1], "lucy") != 0 && strcmp(argv[1], "bob") != 0)
+    {
+        printf("用户仅可选择 lucy 或 bob");
+        return 1;
+    }
+
+    int i = 0;
+    for (; i < 2; i++)
+    {
+        int pid = fork(); // 创建子进程
+        if (pid == 0)
+            break;
+    }
+
+    if (i == 0)
+    {
+        // 第一个子进程
+        if (strcmp(argv[1], "lucy") == 0) // 如果是Lucy方
+        {
+            sendData(fifo_lucy_to_bob, "Lucy"); // 发送数据给Bob
+        }
+        else if (strcmp(argv[1], "bob") == 0) // 如果是Bob方
+        {
+            sendData(fifo_bob_to_lucy, "Bob"); // 发送数据给Lucy
+        }
+    }
+    else if (i == 1)
+    {
+        // 第二个进程，读数据
+        if (strcmp(argv[1], "lucy") == 0) // 如果是Lucy方
+        {
+            receiveData(fifo_bob_to_lucy, "Lucy"); // 接收来自Bob的数据
+        }
+        else if (strcmp(argv[1], "bob") == 0) // 如果是Bob方
+        {
+            receiveData(fifo_lucy_to_bob, "Bob"); // 接收来自Lucy的数据
+        }
+    }
+    else
+    {
+        // 主进程
+        while (1)
+        {
+            int pid_ = waitpid(0, NULL, WNOHANG); // 等待所有子进程退出
+            if (pid_ == -1)
+            {
+                // 所有子进程都已经退出
+                break;
+            }
+        }
+    }
+
+    return 0;
+}
diff --git a/day4/chat_tool/readme.md b/day4/chat_tool/readme.md
new file mode 100644
index 0000000..89372d0
--- /dev/null
+++ b/day4/chat_tool/readme.md
@@ -0,0 +1,53 @@
+使用文档：chat_tool.c
+
+该程序是一个聊天工具，允许两个角色（"lucy" 和 "bob"）之间进行消息的发送和接收。
+
+用法：
+./chat_tool [角色名: lucy | bob]
+
+参数说明：
+
+- 角色名：指定聊天的角色，可选的值为 "lucy" 或 "bob"。
+
+注意事项：
+
+- 在运行程序之前，请确保已经创建了相应的 FIFO（命名管道）。
+- 创建 FIFO 的函数为 `createFifo(const char *fifoName)`，请确保正确调用该函数。
+- FIFO 的名称分别为 "fifo_bob_to_lucy" 和 "fifo_lucy_to_bob"。
+
+示例用法：
+
+1. 创建 FIFO：
+   $ ./chat_tool bob
+   $ ./chat_tool lucy
+
+2. 运行程序：
+
+   - Bob 方发送消息给 Lucy 方：
+     $ ./chat_tool bob
+
+   - Lucy 方发送消息给 Bob 方：
+     $ ./chat_tool lucy
+
+3. 聊天操作：
+   - 在程序运行后，输入消息并按下回车键发送。
+   - 输入 "bye" 退出聊天。
+
+注意事项：
+
+- 请确保在两个不同的终端窗口或会话中分别运行 Bob 方和 Lucy 方。
+- Bob 方和 Lucy 方可以同时发送和接收消息。
+
+示例：
+
+- Bob 方发送消息给 Lucy 方：
+  $ ./chat_tool bob
+  Hello Lucy!
+  How are you?
+  bye
+
+- Lucy 方发送消息给 Bob 方：
+  $ ./chat_tool lucy
+  Hi Bob!
+  I'm good. How about you?
+  bye