Index: Modules/_multiprocessing/multiprocessing.c
===================================================================
--- Modules/_multiprocessing/multiprocessing.c	(révision 64756)
+++ Modules/_multiprocessing/multiprocessing.c	(copie de travail)
@@ -50,6 +50,10 @@
 		PyErr_SetString(PyExc_IOError,
 				"got end of file during message");
 		break;
+	case MP_CLOSED_FILE:
+		PyErr_SetString(PyExc_IOError,
+				"I/O operation on closed file");
+		break;
 	case MP_BAD_MESSAGE_LENGTH:
 		PyErr_SetString(PyExc_IOError, "bad message length");
 		break;
Index: Modules/_multiprocessing/socket_connection.c
===================================================================
--- Modules/_multiprocessing/socket_connection.c	(révision 64756)
+++ Modules/_multiprocessing/socket_connection.c	(copie de travail)
@@ -73,6 +73,9 @@
 static Py_ssize_t
 conn_send_string(ConnectionObject *conn, char *string, size_t length)
 {
+	if (conn->handle == INVALID_HANDLE_VALUE)
+		return MP_CLOSED_FILE;
+
 	/* The "header" of the message is a 32 bit unsigned number (in
 	   network order) which specifies the length of the "body".  If
 	   the message is shorter than about 16kb then it is quicker to
@@ -116,6 +119,9 @@
 	int res;
 	UINT32 ulength;
 
+	if (conn->handle == INVALID_HANDLE_VALUE)
+		return MP_CLOSED_FILE;
+
 	*newbuffer = NULL;
 
 	res = _conn_recvall(conn->handle, (char*)&ulength, 4);
@@ -148,6 +154,9 @@
 	int res;
 	fd_set rfds;
 
+	if (conn->handle == INVALID_HANDLE_VALUE)
+		return MP_CLOSED_FILE;
+
 	FD_ZERO(&rfds);
 	FD_SET((SOCKET)conn->handle, &rfds);
 
Index: Modules/_multiprocessing/multiprocessing.h
===================================================================
--- Modules/_multiprocessing/multiprocessing.h	(révision 64756)
+++ Modules/_multiprocessing/multiprocessing.h	(copie de travail)
@@ -97,6 +97,7 @@
 #define MP_BAD_MESSAGE_LENGTH (-1004)
 #define MP_SOCKET_ERROR (-1005)
 #define MP_EXCEPTION_HAS_BEEN_SET (-1006)
+#define MP_CLOSED_FILE (-1007)
 
 PyObject *mp_SetError(PyObject *Type, int num);
 
Index: Modules/_multiprocessing/pipe_connection.c
===================================================================
--- Modules/_multiprocessing/pipe_connection.c	(révision 64756)
+++ Modules/_multiprocessing/pipe_connection.c	(copie de travail)
@@ -19,6 +19,9 @@
 {
 	DWORD amount_written;
 
+	if (conn->handle == INVALID_HANDLE_VALUE)
+		return MP_CLOSED_FILE;
+
 	return WriteFile(conn->handle, string, length, &amount_written, NULL)
 		? MP_SUCCESS : MP_STANDARD_ERROR;
 }
@@ -37,6 +40,9 @@
 
 	*newbuffer = NULL;
 
+	if (conn->handle == INVALID_HANDLE_VALUE)
+		return MP_CLOSED_FILE;
+
 	if (ReadFile(conn->handle, buffer, MIN(buflength, maxlength), 
 		     &length, NULL))
 		return length;
@@ -83,6 +89,9 @@
 	int difference, res;
 	BOOL block = FALSE;
 
+	if (conn->handle == INVALID_HANDLE_VALUE)
+		return MP_CLOSED_FILE;
+
 	if (!PeekNamedPipe(conn->handle, NULL, 0, NULL, &bytes, NULL))
 		return MP_STANDARD_ERROR;