From 63a0e730096e71c7ce99a14d80727c704b55e2d3 Mon Sep 17 00:00:00 2001
From: flykhan <liubo666666@outlook.com>
Date: Wed, 16 Aug 2023 10:34:26 +0800
Subject: [PATCH] =?UTF-8?q?day2:=20=E4=BD=9C=E4=B8=9A8=20=E5=86=99?=
 =?UTF-8?q?=E6=B3=95=E4=BA=8C?=
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---
 day2/homework/h8_2.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 day2/homework/h8_2.c

diff --git a/day2/homework/h8_2.c b/day2/homework/h8_2.c
new file mode 100644
index 0000000..f694acc
--- /dev/null
+++ b/day2/homework/h8_2.c
@@ -0,0 +1,39 @@
+// 请分析如下程序，如何实现创建2个子进程， 第一个子进程输出ABC,  第二子进程输出 DEF。
+// 做法二
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/wait.h>
+
+int main(int argc, char *argv[])
+{
+    // 创建2个子进程
+    int i;
+    for (i = 0; i < 2; i++)
+    {
+        pid_t pid = fork();
+        if (pid == 0)
+        {
+            if (i == 0)
+                printf("%d ABC\n", getpid());
+
+            else
+                printf("%d DEF\n", getpid());
+
+            _exit(0);
+        }
+    }
+
+    // 等待所有子进程结束
+    while (1)
+    {
+        // 等待任意子进程结束，并获取已终止子进程的进程ID
+        int pid = waitpid(-1, NULL, WUNTRACED); // -1 表示等待任意子进程
+        printf("子进程 %d over\n", pid);
+        if (pid == -1)
+            break;
+    }
+    printf("主进程 %d over\n", getpid());
+
+    return 0;
+}