qemu-iotests: add tests for runtime fd passing via SCM rights

This case will test whether the monitor can receive fd at runtime.
To verify better, additional monitor is created to see if qemu
can handler two monitor instances correctly.

Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/045

 #!/usr/bin/env python
 #
-# Tests for fdsets.
+# Tests for fdsets and getfd.
 #
 # Copyright (C) 2012 IBM Corp.
 #
@@ -125,5 +125,54 @@ class TestFdSets(iotests.QMPTestCase):
                 'No file descriptor supplied via SCM_RIGHTS')
         self.vm.shutdown()
 
+# Add fd at runtime, there are two ways: monitor related or fdset related
+class TestSCMFd(iotests.QMPTestCase):
+    def setUp(self):
+        self.vm = iotests.VM()
+        qemu_img('create', '-f', iotests.imgfmt, image0, '128K')
+        # Add an unused monitor, to verify it works fine when two monitor
+        # instances present
+        self.vm.add_monitor_telnet("0",4445)
+        self.vm.launch()
+
+    def tearDown(self):
+        self.vm.shutdown()
+        os.remove(image0)
+
+    def _send_fd_by_SCM(self):
+        ret = self.vm.send_fd_scm(image0)
+        self.assertEqual(ret, 0, 'Failed to send fd with UNIX SCM')
+
+    def test_add_fd(self):
+        self._send_fd_by_SCM()
+        result = self.vm.qmp('add-fd', fdset_id=2, opaque='image0:r')
+        self.assert_qmp(result, 'return/fdset-id', 2)
+
+    def test_getfd(self):
+        self._send_fd_by_SCM()
+        result = self.vm.qmp('getfd', fdname='image0:r')
+        self.assert_qmp(result, 'return', {})
+
+    def test_getfd_invalid_fdname(self):
+        self._send_fd_by_SCM()
+        result = self.vm.qmp('getfd', fdname='0image0:r')
+        self.assert_qmp(result, 'error/class', 'GenericError')
+        self.assert_qmp(result, 'error/desc',
+            "Parameter 'fdname' expects a name not starting with a digit")
+
+    def test_closefd(self):
+        self._send_fd_by_SCM()
+        result = self.vm.qmp('getfd', fdname='image0:r')
+        self.assert_qmp(result, 'return', {})
+        result = self.vm.qmp('closefd', fdname='image0:r')
+        self.assert_qmp(result, 'return', {})
+
+    def test_closefd_fd_not_found(self):
+        fdname = 'image0:r'
+        result = self.vm.qmp('closefd', fdname=fdname)
+        self.assert_qmp(result, 'error/class', 'GenericError')
+        self.assert_qmp(result, 'error/desc',
+            "File descriptor named '%s' not found" % fdname)
+
 if __name__ == '__main__':
     iotests.main(supported_fmts=['raw'])

tests/qemu-iotests/045.out

-......
+...........
 ----------------------------------------------------------------------
-Ran 6 tests
+Ran 11 tests
 
 OK