unshare: Add bindings for unshare(2)

src/linuxapi/unshare.py

@@ -0,0 +1,35 @@
+import ctypes.util
+import os
+
+
+_libc = ctypes.CDLL(ctypes.util.find_library('c'))
+
+_errno = _libc.__errno_location
+_errno.restype = ctypes.POINTER(ctypes.c_int)
+
+_libc.unshare.argtypes = (ctypes.c_int,)
+_libc.unshare_restype = ctypes.c_int
+
+
+CLONE_FILES = 0x00000400
+CLONE_FS = 0x00000200
+CLONE_NEWIPC = 0x08000000
+CLONE_NEWNET = 0x40000000
+CLONE_NEWNS = 0x00020000
+CLONE_NEWPID = 0x20000000
+CLONE_NEWUSER = 0x10000000
+CLONE_NEWUTS = 0x04000000
+CLONE_SYSVSEM = 0x00040000
+
+
+class UnshareError(OSError):
+
+    @classmethod
+    def from_c_err(cls):
+        errno = _errno().contents.value
+        return cls(errno, os.strerror(errno))
+
+
+def unshare(flags):
+    if _libc.unshare(flags) != 0:
+        raise UnshareError.from_c_err()