Issue #1309352: fcntl now converts its third arguments to a C `long` rather

than an int, which makes some operations possible under 64-bit Linux (e.g.
DN_MULTISHOT with F_NOTIFY).

Lib/test/test_fcntl.py

@@ -61,7 +61,7 @@ class TestFcntl(unittest.TestCase):
         self.f = None
 
     def tearDown(self):
-        if not self.f.closed:
+        if self.f and not self.f.closed:
             self.f.close()
         unlink(TESTFN)
 
@@ -85,6 +85,21 @@ class TestFcntl(unittest.TestCase):
             rv = fcntl.fcntl(self.f, fcntl.F_SETLKW, lockdata)
         self.f.close()
 
+    def test_fcntl_64_bit(self):
+        # Issue #1309352: fcntl shouldn't fail when the third arg fits in a
+        # C 'long' but not in a C 'int'.
+        try:
+            cmd = fcntl.F_NOTIFY
+            # This flag is larger than 2**31 in 64-bit builds
+            flags = fcntl.DN_MULTISHOT
+        except AttributeError:
+            self.skipTest("F_NOTIFY or DN_MULTISHOT unavailable")
+        fd = os.open(os.path.dirname(os.path.abspath(TESTFN)), os.O_RDONLY)
+        try:
+            fcntl.fcntl(fd, cmd, flags)
+        finally:
+            os.close(fd)
+
 
 def test_main():
     run_unittest(TestFcntl)

Misc/NEWS

@@ -302,6 +302,10 @@ Core and Builtins
 Library
 -------
 
+- Issue #1309352: fcntl now converts its third arguments to a C `long` rather
+  than an int, which makes some operations possible under 64-bit Linux (e.g.
+  DN_MULTISHOT with F_NOTIFY).
+
 - Issue #1424152: Fix for httplib, urllib2 to support SSL while working through
   proxy. Original patch by Christopher Li, changes made by Senthil Kumaran.
  

Modules/fcntlmodule.c

@@ -34,7 +34,7 @@ fcntl_fcntl(PyObject *self, PyObject *args)
 {
 	int fd;
 	int code;
-	int arg;
+	long arg;
 	int ret;
 	char *str;
 	Py_ssize_t len;
@@ -61,7 +61,7 @@ fcntl_fcntl(PyObject *self, PyObject *args)
 	PyErr_Clear();
 	arg = 0;
 	if (!PyArg_ParseTuple(args,
-             "O&i|i;fcntl requires a file or file descriptor,"
+             "O&i|l;fcntl requires a file or file descriptor,"
              " an integer and optionally a third integer or a string", 
 			      conv_descriptor, &fd, &code, &arg)) {
 	  return NULL;