kopia lustrzana https://github.com/micropython/micropython
247 wiersze
8.4 KiB
C
247 wiersze
8.4 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016 Paul Sokolovsky
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* Copyright (c) 2017-2019 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <string.h>
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#include "py/mpconfig.h"
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#include "py/runtime.h"
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#include "py/objtuple.h"
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#include "py/objarray.h"
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#include "py/stream.h"
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#include "extmod/misc.h"
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#if MICROPY_PY_OS_DUPTERM
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#include "shared/runtime/interrupt_char.h"
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void mp_os_deactivate(size_t dupterm_idx, const char *msg, mp_obj_t exc) {
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mp_obj_t term = MP_STATE_VM(dupterm_objs[dupterm_idx]);
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MP_STATE_VM(dupterm_objs[dupterm_idx]) = MP_OBJ_NULL;
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mp_printf(&mp_plat_print, msg);
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if (exc != MP_OBJ_NULL) {
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mp_obj_print_exception(&mp_plat_print, exc);
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}
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if (term == MP_OBJ_NULL) {
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// Dupterm was already closed.
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return;
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}
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nlr_buf_t nlr;
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if (nlr_push(&nlr) == 0) {
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mp_stream_close(term);
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nlr_pop();
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} else {
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// Ignore any errors during stream closing
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}
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}
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uintptr_t mp_os_dupterm_poll(uintptr_t poll_flags) {
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uintptr_t poll_flags_out = 0;
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for (size_t idx = 0; idx < MICROPY_PY_OS_DUPTERM; ++idx) {
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mp_obj_t s = MP_STATE_VM(dupterm_objs[idx]);
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if (s == MP_OBJ_NULL) {
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continue;
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}
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int errcode = 0;
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mp_uint_t ret = 0;
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const mp_stream_p_t *stream_p = mp_get_stream(s);
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#if MICROPY_PY_OS_DUPTERM_BUILTIN_STREAM
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if (mp_os_dupterm_is_builtin_stream(s)) {
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ret = stream_p->ioctl(s, MP_STREAM_POLL, poll_flags, &errcode);
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} else
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#endif
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{
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nlr_buf_t nlr;
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if (nlr_push(&nlr) == 0) {
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ret = stream_p->ioctl(s, MP_STREAM_POLL, poll_flags, &errcode);
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nlr_pop();
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} else {
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// Ignore error with ioctl
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}
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}
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if (ret != MP_STREAM_ERROR) {
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poll_flags_out |= ret;
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if (poll_flags_out == poll_flags) {
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// Finish early if all requested flags are set
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break;
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}
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}
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}
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return poll_flags_out;
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}
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int mp_os_dupterm_rx_chr(void) {
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#if MICROPY_PY_OS_DUPTERM_NOTIFY
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// When os.dupterm_notify() is enabled it is usually called from a scheduled
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// function, via mp_os_dupterm_notify(). That can lead to recursive calls of
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// this function when this function is called from mp_hal_stdin_rx_chr():
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// - mp_hal_stdin_rx_chr()
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// - mp_os_dupterm_rx_chr()
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// - <Python code>
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// - os.dupterm_notify() is scheduled via interrupt/event
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// - <Python code> runs scheduled code (eg WebREPL -> rp2.Flash().writeblocks())
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// - mp_os_dupterm_notify()
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// - mp_os_dupterm_rx_chr()
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// Break that cycle by locking the scheduler during this function's duration.
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mp_sched_lock();
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#endif
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int ret = -1; // no chars available
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for (size_t idx = 0; idx < MICROPY_PY_OS_DUPTERM; ++idx) {
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if (MP_STATE_VM(dupterm_objs[idx]) == MP_OBJ_NULL) {
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continue;
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}
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#if MICROPY_PY_OS_DUPTERM_BUILTIN_STREAM
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if (mp_os_dupterm_is_builtin_stream(MP_STATE_VM(dupterm_objs[idx]))) {
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byte buf[1];
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int errcode = 0;
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const mp_stream_p_t *stream_p = mp_get_stream(MP_STATE_VM(dupterm_objs[idx]));
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mp_uint_t out_sz = stream_p->read(MP_STATE_VM(dupterm_objs[idx]), buf, 1, &errcode);
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if (errcode == 0 && out_sz != 0) {
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ret = buf[0];
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break;
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} else {
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continue;
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}
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}
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#endif
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nlr_buf_t nlr;
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if (nlr_push(&nlr) == 0) {
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byte buf[1];
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int errcode;
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const mp_stream_p_t *stream_p = mp_get_stream(MP_STATE_VM(dupterm_objs[idx]));
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mp_uint_t out_sz = stream_p->read(MP_STATE_VM(dupterm_objs[idx]), buf, 1, &errcode);
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if (out_sz == 0) {
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nlr_pop();
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mp_os_deactivate(idx, "dupterm: EOF received, deactivating\n", MP_OBJ_NULL);
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} else if (out_sz == MP_STREAM_ERROR) {
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// errcode is valid
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if (mp_is_nonblocking_error(errcode)) {
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nlr_pop();
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} else {
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mp_raise_OSError(errcode);
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}
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} else {
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// read 1 byte
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nlr_pop();
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ret = buf[0];
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if (ret == mp_interrupt_char) {
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// Signal keyboard interrupt to be raised as soon as the VM resumes
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mp_sched_keyboard_interrupt();
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ret = -2;
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}
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break;
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}
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} else {
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mp_os_deactivate(idx, "dupterm: Exception in read() method, deactivating: ", MP_OBJ_FROM_PTR(nlr.ret_val));
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}
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}
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#if MICROPY_PY_OS_DUPTERM_NOTIFY
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mp_sched_unlock();
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#endif
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return ret;
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}
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int mp_os_dupterm_tx_strn(const char *str, size_t len) {
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// Returns the minimum successful write length, or -1 if no write is attempted.
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int ret = len;
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bool did_write = false;
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for (size_t idx = 0; idx < MICROPY_PY_OS_DUPTERM; ++idx) {
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if (MP_STATE_VM(dupterm_objs[idx]) == MP_OBJ_NULL) {
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continue;
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}
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did_write = true;
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#if MICROPY_PY_OS_DUPTERM_BUILTIN_STREAM
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if (mp_os_dupterm_is_builtin_stream(MP_STATE_VM(dupterm_objs[idx]))) {
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int errcode = 0;
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const mp_stream_p_t *stream_p = mp_get_stream(MP_STATE_VM(dupterm_objs[idx]));
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mp_uint_t written = stream_p->write(MP_STATE_VM(dupterm_objs[idx]), str, len, &errcode);
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int write_res = MAX(0, written);
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ret = MIN(write_res, ret);
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continue;
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}
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#endif
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nlr_buf_t nlr;
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if (nlr_push(&nlr) == 0) {
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mp_obj_t written = mp_stream_write(MP_STATE_VM(dupterm_objs[idx]), str, len, MP_STREAM_RW_WRITE);
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if (written == mp_const_none) {
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ret = 0;
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} else if (mp_obj_is_small_int(written)) {
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int written_int = MAX(0, MP_OBJ_SMALL_INT_VALUE(written));
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ret = MIN(written_int, ret);
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}
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nlr_pop();
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} else {
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mp_os_deactivate(idx, "dupterm: Exception in write() method, deactivating: ", MP_OBJ_FROM_PTR(nlr.ret_val));
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ret = 0;
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}
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}
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return did_write ? ret : -1;
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}
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static mp_obj_t mp_os_dupterm(size_t n_args, const mp_obj_t *args) {
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mp_int_t idx = 0;
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if (n_args == 2) {
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idx = mp_obj_get_int(args[1]);
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}
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if (idx < 0 || idx >= MICROPY_PY_OS_DUPTERM) {
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mp_raise_ValueError(MP_ERROR_TEXT("invalid dupterm index"));
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}
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mp_obj_t previous_obj = MP_STATE_VM(dupterm_objs[idx]);
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if (previous_obj == MP_OBJ_NULL) {
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previous_obj = mp_const_none;
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}
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if (args[0] == mp_const_none) {
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MP_STATE_VM(dupterm_objs[idx]) = MP_OBJ_NULL;
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} else {
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mp_get_stream_raise(args[0], MP_STREAM_OP_READ | MP_STREAM_OP_WRITE | MP_STREAM_OP_IOCTL);
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MP_STATE_VM(dupterm_objs[idx]) = args[0];
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}
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#if MICROPY_PY_OS_DUPTERM_STREAM_DETACHED_ATTACHED
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mp_os_dupterm_stream_detached_attached(previous_obj, args[0]);
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#endif
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return previous_obj;
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}
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MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_os_dupterm_obj, 1, 2, mp_os_dupterm);
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MP_REGISTER_ROOT_POINTER(mp_obj_t dupterm_objs[MICROPY_PY_OS_DUPTERM]);
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#endif // MICROPY_PY_OS_DUPTERM
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