addd example and support for load and attach

examples/execve.py

@@ -0,0 +1,41 @@
+from pythonbpf import bpf, map, section, bpfglobal, BPF
+from ctypes import c_void_p, c_int64, c_int32, c_uint64
+from pythonbpf.helpers import ktime
+from pythonbpf.maps import HashMap
+import time
+
+@bpf
+@map
+def last() -> HashMap:
+    return HashMap(key=c_uint64, value=c_uint64, max_entries=1)
+
+
+@bpf
+@section("tracepoint/syscalls/sys_enter_execve")
+def hello(ctx: c_void_p) -> c_int32:
+    print("entered")
+    print("multi constant support")
+    return c_int32(0)
+
+
+@bpf
+@section("tracepoint/syscalls/sys_exit_execve")
+def hello_again(ctx: c_void_p) -> c_int64:
+    print("exited")
+    key = 0
+    tsp = last().lookup(key)
+    print(tsp)
+    ts = ktime()
+    return c_int64(0)
+
+
+@bpf
+@bpfglobal
+def LICENSE() -> str:
+    return "GPL"
+
+b = BPF()
+b.load_and_attach()
+while True:
+    print("running")
+    time.sleep(1)