Initial setup

src/init/init.cc

@@ -0,0 +1,42 @@
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include <cstdlib>
+#include <iostream>
+
+int main()
+{
+    // PID 1
+
+    int console = open("/dev/console", O_RDWR);
+
+    if (console < 0)
+    {
+        perror("open /dev/console");
+        return 1;
+    }
+
+    dup2(console, STDIN_FILENO);
+    dup2(console, STDOUT_FILENO);
+    dup2(console, STDERR_FILENO);
+
+    close(console);
+
+    while (true)
+    {
+        pid_t pid = fork();
+
+        if (pid == 0)
+        {
+            execl("/bin/sh", "sh", nullptr);
+            perror("exec");
+            _exit(127);
+        }
+
+        if (pid > 0)
+        {
+            waitpid(pid, nullptr, 0);
+        }
+    }
+}