Index: Objects/fileobject.c
===================================================================
RCS file: /cvsroot/python/python/dist/src/Objects/fileobject.c,v
retrieving revision 2.169
diff -u -r2.169 fileobject.c
--- Objects/fileobject.c	3 Oct 2002 05:10:39 -0000	2.169
+++ Objects/fileobject.c	12 Nov 2002 15:55:34 -0000
@@ -770,18 +770,25 @@
 		if (chunksize == 0) {
 			if (!ferror(f->f_fp))
 				break;
+			if (errno == EWOULDBLOCK && bytesread > 0)
+				break;
 			PyErr_SetFromErrno(PyExc_IOError);
 			clearerr(f->f_fp);
 			Py_DECREF(v);
 			return NULL;
 		}
 		bytesread += chunksize;
-		if (bytesread < buffersize)
+		if (bytesread < buffersize) {
+			clearerr(f->f_fp);
 			break;
+		}
 		if (bytesrequested < 0) {
 			buffersize = new_buffersize(f, buffersize);
 			if (_PyString_Resize(&v, buffersize) < 0)
 				return NULL;
+		} else {
+			assert(bytesread == bytesrequested);
+			break;
 		}
 	}
 	if (bytesread != buffersize)