py/modio: Allow uio.IOBase streams to return errno for read/write error.
This allows user code that inherits from uio.IOBase to return an errno error code from the user readinto/write function, by returning a negative value. Eg returning -123 means an errno of 123. This is already how the custom ioctl works.
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py/modio.c
11
py/modio.c
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@ -59,12 +59,17 @@ STATIC mp_uint_t iobase_read_write(mp_obj_t obj, void *buf, mp_uint_t size, int
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mp_load_method(obj, qst, dest);
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mp_obj_array_t ar = {{&mp_type_bytearray}, BYTEARRAY_TYPECODE, 0, size, buf};
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dest[2] = MP_OBJ_FROM_PTR(&ar);
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mp_obj_t ret = mp_call_method_n_kw(1, 0, dest);
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if (ret == mp_const_none) {
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mp_obj_t ret_obj = mp_call_method_n_kw(1, 0, dest);
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if (ret_obj == mp_const_none) {
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*errcode = MP_EAGAIN;
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return MP_STREAM_ERROR;
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}
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mp_int_t ret = mp_obj_get_int(ret_obj);
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if (ret >= 0) {
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return ret;
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} else {
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return mp_obj_get_int(ret);
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*errcode = -ret;
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return MP_STREAM_ERROR;
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}
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}
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STATIC mp_uint_t iobase_read(mp_obj_t obj, void *buf, mp_uint_t size, int *errcode) {
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