Support simple XDP

demo/pybpf0.py

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+from pythonbpf import bpf, section, bpfglobal, compile
+
+from ctypes import c_void_p, c_int64
+
+# Instructions to how to run this program
+# 1. Install PythonBPF: pip install pythonbpf
+# 2. Run the program: python demo/pybpf0.py
+# 3. Run the program with sudo: sudo examples/check.sh run demo/pybpf0.o
+# 4. Start up any program and watch the output
+
+
+@bpf
+@section("tracepoint/syscalls/sys_enter_execve")
+def hello_world(ctx: c_void_p) -> c_int64:
+    print("Hello, World!")
+    return c_int64(0)
+
+@bpf
+@bpfglobal
+def LICENSE() -> str:
+    return "GPL"
+
+compile()