Register bpf_get_current_comm_emitter for comm

pythonbpf/helper/bpf_helper_handler.py

@@ -23,6 +23,7 @@ class BPFHelperID(Enum):
     BPF_KTIME_GET_NS = 5
     BPF_PRINTK = 6
     BPF_GET_CURRENT_PID_TGID = 14
+    BPF_GET_CURRENT_COMM = 16
     BPF_PERF_EVENT_OUTPUT = 25
 
 
@@ -234,6 +235,23 @@ def bpf_map_delete_elem_emitter(
     return result, None
 
 
+@HelperHandlerRegistry.register("comm")
+def bpf_get_current_comm_emitter(
+    call,
+    map_ptr,
+    module,
+    builder,
+    func,
+    local_sym_tab=None,
+    struct_sym_tab=None,
+    map_sym_tab=None,
+):
+    """
+    Emit LLVM IR for bpf_get_current_comm helper function call.
+    """
+    pass  # Not implemented yet
+
+
 @HelperHandlerRegistry.register("pid")
 def bpf_get_current_pid_tgid_emitter(
     call,

pythonbpf/helper/helpers.py

@@ -2,19 +2,26 @@ import ctypes
 
 
 def ktime():
+    """get current ktime"""
     return ctypes.c_int64(0)
 
 
 def pid():
+    """get current process id"""
     return ctypes.c_int32(0)
 
 
 def deref(ptr):
-    "dereference a pointer"
+    """dereference a pointer"""
     result = ctypes.cast(ptr, ctypes.POINTER(ctypes.c_void_p)).contents.value
     return result if result is not None else 0
 
 
+def comm(buf):
+    """get current process command name"""
+    return ctypes.c_int64(0)
+
+
 XDP_ABORTED = ctypes.c_int64(0)
 XDP_DROP = ctypes.c_int64(1)
 XDP_PASS = ctypes.c_int64(2)