🦄 refactor(C13, C14, C115): 更新了linux系统开发部分的结构

C15-进程/sleep.c

@@ -0,0 +1,45 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+/**
+ * @brief    few: folk, execl, wait
+ * @details
+ *
+ * @param    argc
+ * @param    argv
+ * @return  int
+ */
+int main(int argc, char **argv)
+{
+    pid_t pid;
+
+    puts("Begin!");
+
+    fflush(NULL);
+
+    pid = fork();
+    if (pid < 0)
+    {
+        perror("fork()");
+        exit(1);
+    }
+
+    if (0 == pid)   // child
+    {
+        // execl("/bin/sleep", "sleep", "100", NULL);
+        execl("/bin/sleep", "httpd", "100", NULL);
+        // ! 低级木马：进程树里看到的是httpd 100
+
+        perror("execl()");
+        exit(1);
+    }
+
+    wait(NULL);
+
+    puts("End!");
+
+    exit(0);
+}