syscalls: allow logging of syscalls

1 files changed, 6 insertions, 0 deletions

diff --git a/linuxnamespaces/syscalls.py b/linuxnamespaces/syscalls.py
index d9d37eb..986238c 100644
--- a/linuxnamespaces/syscalls.py
+++ b/linuxnamespaces/syscalls.py
@@ -10,12 +10,16 @@ import ctypes
 import dataclasses
 import enum
 import errno
+import logging
 import os
 import typing
 
 from .atlocation import AtFlags, AtLocation, AtLocationLike, PathConvertible
 
 
+logger = logging.getLogger(__name__)
+
+
 LIBC_SO = ctypes.CDLL(None, use_errno=True)
 
 
@@ -363,7 +367,9 @@ def call_libc(funcname: str, *args: typing.Any) -> int:
     the function returns an integer that is non-negative on success. On
     failure, an OSError with errno is raised.
     """
+    logger.debug("calling libc function %s%r", funcname, args)
     ret: int = LIBC_SO[funcname](*args)
+    logger.debug("%s returned %d", funcname, ret)
     if ret < 0:
         err = ctypes.get_errno()
         raise OSError(