feat(user): add user-space build system and init process to test fork/wait

1 files changed, 34 insertions, 0 deletions

diff --git a/src/user/init.cc b/src/user/init.cc
new file mode 100644
index 0000000..3c42adf
--- /dev/null
+++ b/src/user/init.cc
@@ -0,0 +1,34 @@
+#include "user/user.h"
+
+int main();
+
+extern "C" void _start()
+{
+    exit(main());
+}
+
+int main()
+{
+    int pid = fork();
+
+    if (pid < 0)
+    {
+        write(1, "Fork failed\n", 12);
+        exit(1);
+    }
+
+    if (pid == 0)
+    {
+        write(1, "Hello from Child!\n", 18);
+        exit(0);
+    }
+    else
+    {
+        write(1, "Parent waiting...\n", 18);
+        wait(0);
+        write(1, "Parent: Child exited.\n", 22);
+    }
+
+    while (1);
+    return 0;
+}
\ No newline at end of file