Merge tag 'v1.9.1'2.0.0-alpha.0

Fixes for stmhal USB mass storage, lwIP bindings and VFS regressions

This release provides an important fix for the USB mass storage device in
the stmhal port by implementing the SCSI SYNCHRONIZE_CACHE command, which
is now require by some Operating Systems.  There are also fixes for the
lwIP bindings to improve non-blocking sockets and error codes.  The VFS has
some regressions fixed including the ability to statvfs the root.

All changes are listed below.

py core:
- modbuiltins: add core-provided version of input() function
- objstr: catch case of negative "maxsplit" arg to str.rsplit()
- persistentcode: allow to compile with complex numbers disabled
- objstr: allow to compile with obj-repr D, and unicode disabled
- modsys: allow to compile with obj-repr D and PY_ATTRTUPLE disabled
- provide mp_decode_uint_skip() to help reduce stack usage
- makeqstrdefs.py: make script run correctly with Python 2.6
- objstringio: if created from immutable object, follow copy on write policy

extmod:
- modlwip: connect: for non-blocking mode, return EINPROGRESS
- modlwip: fix error codes for duplicate calls to connect()
- modlwip: accept: fix error code for non-blocking mode
- vfs: allow to statvfs the root directory
- vfs: allow "buffering" and "encoding" args to VFS's open()
- modframebuf: fix signed/unsigned comparison pendantic warning

lib:
- libm: use isfinite instead of finitef, for C99 compatibility
- utils/interrupt_char: remove support for KBD_EXCEPTION disabled

tests:
- basics/string_rsplit: add tests for negative "maxsplit" argument
- float: convert "sys.exit()" to "raise SystemExit"
- float/builtin_float_minmax: PEP8 fixes
- basics: convert "sys.exit()" to "raise SystemExit"
- convert remaining "sys.exit()" to "raise SystemExit"

unix port:
- convert to use core-provided version of built-in import()
- Makefile: replace references to make with $(MAKE)

windows port:
- convert to use core-provided version of built-in import()

qemu-arm port:
- Makefile: adjust object-file lists to get correct dependencies
- enable micropython.mem_*() functions to allow more tests

stmhal port:
- boards: enable DAC for NUCLEO_F767ZI board
- add support for NUCLEO_F446RE board
- pass USB handler as parameter to allow more than one USB handler
- usb: use local USB handler variable in Start-of-Frame handler
- usb: make state for USB device private to top-level USB driver
- usbdev: for MSC implement SCSI SYNCHRONIZE_CACHE command
- convert from using stmhal's input() to core provided version

cc3200 port:
- convert from using stmhal's input() to core provided version

teensy port:
- convert from using stmhal's input() to core provided version

esp8266 port:
- Makefile: replace references to make with $(MAKE)
- Makefile: add clean-modules target
- convert from using stmhal's input() to core provided version

zephyr port:
- modusocket: getaddrinfo: Fix mp_obj_len() usage
- define MICROPY_PY_SYS_PLATFORM (to "zephyr")
- machine_pin: use native Zephyr types for Zephyr API calls

docs:
- machine.Pin: remove out_value() method
- machine.Pin: add on() and off() methods
- esp8266: consistently replace Pin.high/low methods with .on/off
- esp8266/quickref: polish Pin.on()/off() examples
- network: move confusingly-named cc3200 Server class to its reference
- uos: deconditionalize, remove minor port-specific details
- uos: move cc3200 port legacy VFS mounting functions to its ref doc
- machine: sort machine classes in logical order, not alphabetically
- network: first step to describe standard network class interface

examples:
- embedding: use core-provided KeyboardInterrupt object

1 files changed, 73 insertions, 5 deletions

diff --git a/unix/moduselect.c b/unix/moduselect.c
index e74c44be6..37a3a33b2 100644
--- a/unix/moduselect.c
+++ b/unix/moduselect.c
@@ -4,7 +4,7 @@
  * The MIT License (MIT)
  *
  * Copyright (c) 2014 Damien P. George
- * Copyright (c) 2015 Paul Sokolovsky
+ * Copyright (c) 2015-2017 Paul Sokolovsky
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -55,6 +55,11 @@ typedef struct _mp_obj_poll_t {
     unsigned short len;
     struct pollfd *entries;
     mp_obj_t *obj_map;
+    short iter_cnt;
+    short iter_idx;
+    int flags;
+    // callee-owned tuple
+    mp_obj_t ret_tuple;
 } mp_obj_poll_t;
 
 STATIC int get_fd(mp_obj_t fdlike) {
@@ -164,9 +169,7 @@ STATIC mp_obj_t poll_modify(mp_obj_t self_in, mp_obj_t obj_in, mp_obj_t eventmas
 }
 MP_DEFINE_CONST_FUN_OBJ_3(poll_modify_obj, poll_modify);
 
-/// \method poll([timeout])
-/// Timeout is in milliseconds.
-STATIC mp_obj_t poll_poll(size_t n_args, const mp_obj_t *args) {
+STATIC int poll_poll_internal(size_t n_args, const mp_obj_t *args) {
     mp_obj_poll_t *self = MP_OBJ_TO_PTR(args[0]);
 
     // work out timeout (it's given already in ms)
@@ -184,12 +187,24 @@ STATIC mp_obj_t poll_poll(size_t n_args, const mp_obj_t *args) {
         }
     }
 
+    self->flags = flags;
+
     int n_ready = poll(self->entries, self->len, timeout);
     RAISE_ERRNO(n_ready, errno);
+    return n_ready;
+}
+
+/// \method poll([timeout])
+/// Timeout is in milliseconds.
+STATIC mp_obj_t poll_poll(size_t n_args, const mp_obj_t *args) {
+    int n_ready = poll_poll_internal(n_args, args);
+
     if (n_ready == 0) {
         return mp_const_empty_tuple;
     }
 
+    mp_obj_poll_t *self = MP_OBJ_TO_PTR(args[0]);
+
     mp_obj_list_t *ret_list = MP_OBJ_TO_PTR(mp_obj_new_list(n_ready, NULL));
     int ret_i = 0;
     struct pollfd *entries = self->entries;
@@ -204,7 +219,7 @@ STATIC mp_obj_t poll_poll(size_t n_args, const mp_obj_t *args) {
             }
             t->items[1] = MP_OBJ_NEW_SMALL_INT(entries->revents);
             ret_list->items[ret_i++] = MP_OBJ_FROM_PTR(t);
-            if (flags & FLAG_ONESHOT) {
+            if (self->flags & FLAG_ONESHOT) {
                 entries->events = 0;
             }
         }
@@ -214,17 +229,68 @@ STATIC mp_obj_t poll_poll(size_t n_args, const mp_obj_t *args) {
 }
 MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(poll_poll_obj, 1, 3, poll_poll);
 
+STATIC mp_obj_t poll_ipoll(size_t n_args, const mp_obj_t *args) {
+    mp_obj_poll_t *self = MP_OBJ_TO_PTR(args[0]);
+
+    if (self->ret_tuple == MP_OBJ_NULL) {
+        self->ret_tuple = mp_obj_new_tuple(2, NULL);
+    }
+
+    int n_ready = poll_poll_internal(n_args, args);
+    self->iter_cnt = n_ready;
+    self->iter_idx = 0;
+
+    return args[0];
+}
+MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(poll_ipoll_obj, 1, 3, poll_ipoll);
+
+STATIC mp_obj_t poll_iternext(mp_obj_t self_in) {
+    mp_obj_poll_t *self = MP_OBJ_TO_PTR(self_in);
+
+    if (self->iter_cnt == 0) {
+        return MP_OBJ_STOP_ITERATION;
+    }
+
+    self->iter_cnt--;
+
+    struct pollfd *entries = self->entries + self->iter_idx;
+    for (int i = self->iter_idx; i < self->len; i++, entries++) {
+        self->iter_idx++;
+        if (entries->revents != 0) {
+            mp_obj_tuple_t *t = MP_OBJ_TO_PTR(self->ret_tuple);
+            // If there's an object stored, return it, otherwise raw fd
+            if (self->obj_map && self->obj_map[i] != MP_OBJ_NULL) {
+                t->items[0] = self->obj_map[i];
+            } else {
+                t->items[0] = MP_OBJ_NEW_SMALL_INT(entries->fd);
+            }
+            t->items[1] = MP_OBJ_NEW_SMALL_INT(entries->revents);
+            if (self->flags & FLAG_ONESHOT) {
+                entries->events = 0;
+            }
+            return MP_OBJ_FROM_PTR(t);
+        }
+    }
+
+    assert(!"inconsistent number of poll active entries");
+    self->iter_cnt = 0;
+    return MP_OBJ_STOP_ITERATION;
+}
+
 STATIC const mp_rom_map_elem_t poll_locals_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_register), MP_ROM_PTR(&poll_register_obj) },
     { MP_ROM_QSTR(MP_QSTR_unregister), MP_ROM_PTR(&poll_unregister_obj) },
     { MP_ROM_QSTR(MP_QSTR_modify), MP_ROM_PTR(&poll_modify_obj) },
     { MP_ROM_QSTR(MP_QSTR_poll), MP_ROM_PTR(&poll_poll_obj) },
+    { MP_ROM_QSTR(MP_QSTR_ipoll), MP_ROM_PTR(&poll_ipoll_obj) },
 };
 STATIC MP_DEFINE_CONST_DICT(poll_locals_dict, poll_locals_dict_table);
 
 STATIC const mp_obj_type_t mp_type_poll = {
     { &mp_type_type },
     .name = MP_QSTR_poll,
+    .getiter = mp_identity_getiter,
+    .iternext = poll_iternext,
     .locals_dict = (void*)&poll_locals_dict,
 };
 
@@ -239,6 +305,8 @@ STATIC mp_obj_t select_poll(size_t n_args, const mp_obj_t *args) {
     poll->alloc = alloc;
     poll->len = 0;
     poll->obj_map = NULL;
+    poll->iter_cnt = 0;
+    poll->ret_tuple = MP_OBJ_NULL;
     return MP_OBJ_FROM_PTR(poll);
 }
 MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_select_poll_obj, 0, 1, select_poll);