py: Add ioctl method to stream protocol; add initial modselect.

extmod/modselect.c

+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2014 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <assert.h>
+#include <string.h>
+#include <stdint.h>
+#include "mpconfig.h"
+#include "misc.h"
+#include "nlr.h"
+#include "qstr.h"
+#include "obj.h"
+#include "runtime.h"
+#include "objtuple.h"
+#include "binary.h"
+
+#if MICROPY_PY_SELECT
+
+/// \module select - Provides select function to wait for events on a stream
+///
+/// This module provides the select function.
+
+/// \function select(rlist, wlist, xlist[, timeout])
+mp_obj_t select_select(uint n_args, const mp_obj_t *args) {
+    return mp_obj_new_bytes((void*)mp_obj_int_get(ptr), mp_obj_int_get(size));
+}
+MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(select_select_obj, 3, 4, select_select);
+
+STATIC const mp_map_elem_t mp_module_select_globals_table[] = {
+    { MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_select) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_select), (mp_obj_t)&select_select_obj },
+};
+
+STATIC const mp_obj_dict_t mp_module_select_globals = {
+    .base = {&mp_type_dict},
+    .map = {
+        .all_keys_are_qstrs = 1,
+        .table_is_fixed_array = 1,
+        .used = MP_ARRAY_SIZE(mp_module_select_globals_table),
+        .alloc = MP_ARRAY_SIZE(mp_module_select_globals_table),
+        .table = (mp_map_elem_t*)mp_module_select_globals_table,
+    },
+};
+
+const mp_obj_module_t mp_module_select = {
+    .base = { &mp_type_module },
+    .name = MP_QSTR_select,
+    .globals = (mp_obj_dict_t*)&mp_module_select_globals,
+};
+
+#endif // MICROPY_PY_SELECT

py/mpconfig.h

@@ -390,6 +390,10 @@ typedef double mp_float_t;
 #define MICROPY_PY_ZLIBD (0)
 #endif
 
+#ifndef MICROPY_PY_SELECT
+#define MICROPY_PY_SELECT (0)
+#endif
+
 /*****************************************************************************/
 /* Hooks for a port to add builtins                                          */
 

py/obj.h

@@ -230,12 +230,14 @@ void mp_get_buffer_raise(mp_obj_t obj, mp_buffer_info_t *bufinfo, mp_uint_t flag
 
 // Stream protocol
 #define MP_STREAM_ERROR (-1)
+#define MP_STREAM_FLUSH (1)
+#define MP_STREAM_POLL  (2)
 typedef struct _mp_stream_p_t {
     // On error, functions should return MP_STREAM_ERROR and fill in *errcode (values
     // are implementation-dependent, but will be exposed to user, e.g. via exception).
     mp_uint_t (*read)(mp_obj_t obj, void *buf, mp_uint_t size, int *errcode);
     mp_uint_t (*write)(mp_obj_t obj, const void *buf, mp_uint_t size, int *errcode);
-    // add seek() ?
+    mp_uint_t (*ioctl(mp_obj_t obj, mp_uint_t request, int *errcode, ...);
     mp_uint_t is_text : 1; // default is bytes, set this for text stream
 } mp_stream_p_t;