libc module

kvmd/libc.py

@@ -0,0 +1,59 @@
+# ========================================================================== #
+#                                                                            #
+#    KVMD - The main PiKVM daemon.                                           #
+#                                                                            #
+#    Copyright (C) 2018-2021  Maxim Devaev <mdevaev@gmail.com>               #
+#                                                                            #
+#    This source file is partially based on python-watchdog module.          #
+#                                                                            #
+#    This program is free software: you can redistribute it and/or modify    #
+#    it under the terms of the GNU General Public License as published by    #
+#    the Free Software Foundation, either version 3 of the License, or       #
+#    (at your option) any later version.                                     #
+#                                                                            #
+#    This program is distributed in the hope that it will be useful,         #
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of          #
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           #
+#    GNU General Public License for more details.                            #
+#                                                                            #
+#    You should have received a copy of the GNU General Public License       #
+#    along with this program.  If not, see <https://www.gnu.org/licenses/>.  #
+#                                                                            #
+# ========================================================================== #
+
+
+import ctypes
+import ctypes.util
+
+from ctypes import c_int
+from ctypes import c_uint32
+from ctypes import c_char_p
+
+
+# =====
+def _load_libc() -> ctypes.CDLL:
+    path = ctypes.util.find_library("c")
+    if not path:
+        raise RuntimeError("Where is libc?")
+    assert path
+    lib = ctypes.CDLL(path)
+    for (name, restype, argtypes) in [
+        ("inotify_init", c_int, []),
+        ("inotify_add_watch", c_int, [c_int, c_char_p, c_uint32]),
+        ("inotify_rm_watch", c_int, [c_int, c_uint32]),
+    ]:
+        func = getattr(lib, name)
+        if not func:
+            raise RuntimeError(f"Where is libc.{name}?")
+        setattr(func, "restype", restype)
+        setattr(func, "argtypes", argtypes)
+    return lib
+
+
+_libc = _load_libc()
+
+
+# =====
+inotify_init = _libc.inotify_init
+inotify_add_watch = _libc.inotify_add_watch
+inotify_rm_watch = _libc.inotify_rm_watch