Method test_proxy_fd_dup

tests/test_kernel_proxy.py:155–180

ql_proxy_fd.dup() creates a working copy.

(self)

        del ql

    def test_proxy_fd_dup(self):
        """ql_proxy_fd.dup() creates a working copy."""
        from qiling.os.posix.kernel_proxy import KernelProxy
        from qiling.os.posix.kernel_proxy.proxy_fd import ql_proxy_fd

        ql = Qiling([self.HELLO_BIN], self.ROOTFS, verbose=QL_VERBOSE.OFF)
        proxy = KernelProxy(ql)
        proxy.forward_syscall('eventfd2', returns_fd=True)

        hook = ql.os.posix_syscall_hooks[QL_INTERCEPT.CALL]['ql_syscall_eventfd2']
        guest_fd = hook(ql, 0, 0)
        fd_obj = ql.os.fd[guest_fd]

        duped = fd_obj.dup()
        self.assertIsInstance(duped, ql_proxy_fd)
        self.assertNotEqual(fd_obj._proxy_fd, duped._proxy_fd)

        # write on original, read on dup
        fd_obj.write(struct.pack('<Q', 7))
        data = duped.read(8)
        self.assertEqual(struct.unpack('<Q', data)[0], 7)

        fd_obj.close()
        duped.close()
        proxy.stop()
        del ql

    # -------------------------------------------------------------------------
    # User hooks coexist with proxy hooks