Add passing test struct_pylib.py

Author: r41k0u

tests/passing_tests/struct_pylib.py

@@ -0,0 +1,93 @@
+"""
+Test struct values in HashMap.
+
+This example stores a struct in a HashMap and reads it back,
+testing the new set_value_struct() functionality in pylibbpf.
+"""
+
+from pythonbpf import bpf, map, struct, section, bpfglobal, BPF
+from pythonbpf.helper import ktime, smp_processor_id, pid, comm
+from pythonbpf.maps import HashMap
+from ctypes import c_void_p, c_int64, c_uint32, c_uint64
+import time
+import os
+
+
+@bpf
+@struct
+class task_info:
+    pid: c_uint64
+    timestamp: c_uint64
+    comm: str(16)
+
+
+@bpf
+@map
+def cpu_tasks() -> HashMap:
+    return HashMap(key=c_uint32, value=task_info, max_entries=256)
+
+
+@bpf
+@section("tracepoint/sched/sched_switch")
+def trace_sched_switch(ctx: c_void_p) -> c_int64:
+    cpu = smp_processor_id()
+
+    # Create task info struct
+    info = task_info()
+    info.pid = pid()
+    info.timestamp = ktime()
+    comm(info.comm)
+
+    # Store in map
+    cpu_tasks.update(cpu, info)
+
+    return 0  # type: ignore
+
+
+@bpf
+@bpfglobal
+def LICENSE() -> str:
+    return "GPL"
+
+
+# Compile and load
+b = BPF()
+b.load()
+b.attach_all()
+
+print("Testing HashMap with Struct Values")
+
+cpu_map = b["cpu_tasks"]
+cpu_map.set_value_struct("task_info")  # Enable struct deserialization
+
+print("Listening for context switches.. .\n")
+
+num_cpus = os.cpu_count() or 16
+
+try:
+    while True:
+        time.sleep(1)
+
+        print(f"--- Snapshot at {time.strftime('%H:%M:%S')} ---")
+
+        for cpu in range(num_cpus):
+            try:
+                info = cpu_map.lookup(cpu)
+
+                if info:
+                    comm_str = (
+                        bytes(info.comm).decode("utf-8", errors="ignore").rstrip("\x00")
+                    )
+                    ts_sec = info.timestamp / 1e9
+
+                    print(
+                        f"  CPU {cpu}: PID={info.pid}, comm={comm_str}, ts={ts_sec:.3f}s"
+                    )
+            except KeyError:
+                # No data for this CPU yet
+                pass
+
+        print()
+
+except KeyboardInterrupt:
+    print("\nStopped")