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circuitpython/ports/unix/unix_mphal.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2015 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 <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/time.h>
#include <fcntl.h>
#include "py/mphal.h"
#include "py/mpthread.h"
#include "py/runtime.h"
#include "extmod/misc.h"
#if defined(__GLIBC__) && defined(__GLIBC_PREREQ)
#if __GLIBC_PREREQ(2, 25)
#include <sys/random.h>
#define _HAVE_GETRANDOM
#endif
#endif
#ifndef _WIN32
#include <signal.h>
STATIC void sighandler(int signum) {
if (signum == SIGINT) {
#if MICROPY_ASYNC_KBD_INTR
#if MICROPY_PY_THREAD_GIL
// Since signals can occur at any time, we may not be holding the GIL when
// this callback is called, so it is not safe to raise an exception here
#error "MICROPY_ASYNC_KBD_INTR and MICROPY_PY_THREAD_GIL are not compatible"
#endif
mp_obj_exception_clear_traceback(MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_kbd_exception)));
sigset_t mask;
sigemptyset(&mask);
// On entry to handler, its signal is blocked, and unblocked on
// normal exit. As we instead perform longjmp, unblock it manually.
sigprocmask(SIG_SETMASK, &mask, NULL);
nlr_raise(MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_kbd_exception)));
#else
if (MP_STATE_MAIN_THREAD(mp_pending_exception) == MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_kbd_exception))) {
// this is the second time we are called, so die straight away
exit(1);
}
mp_sched_keyboard_interrupt();
#endif
}
}
#endif
// CIRCUITPY-CHANGE: mp_hal_set_interrupt_char(int) instead of char
void mp_hal_set_interrupt_char(int c) {
// configure terminal settings to (not) let ctrl-C through
if (c == CHAR_CTRL_C) {
#ifndef _WIN32
// enable signal handler
struct sigaction sa;
sa.sa_flags = 0;
sa.sa_handler = sighandler;
sigemptyset(&sa.sa_mask);
sigaction(SIGINT, &sa, NULL);
#endif
} else {
#ifndef _WIN32
// disable signal handler
struct sigaction sa;
sa.sa_flags = 0;
sa.sa_handler = SIG_DFL;
sigemptyset(&sa.sa_mask);
sigaction(SIGINT, &sa, NULL);
#endif
}
}
// CIRCUITPY-CHANGE
bool mp_hal_is_interrupted(void) {
return false;
}
#if MICROPY_USE_READLINE == 1
#include <termios.h>
static struct termios orig_termios;
void mp_hal_stdio_mode_raw(void) {
// save and set terminal settings
tcgetattr(0, &orig_termios);
static struct termios termios;
termios = orig_termios;
termios.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
termios.c_cflag = (termios.c_cflag & ~(CSIZE | PARENB)) | CS8;
termios.c_lflag = 0;
termios.c_cc[VMIN] = 1;
termios.c_cc[VTIME] = 0;
tcsetattr(0, TCSAFLUSH, &termios);
}
void mp_hal_stdio_mode_orig(void) {
// restore terminal settings
tcsetattr(0, TCSAFLUSH, &orig_termios);
}
#endif
#if MICROPY_PY_OS_DUPTERM
static int call_dupterm_read(size_t idx) {
nlr_buf_t nlr;
if (nlr_push(&nlr) == 0) {
mp_obj_t read_m[3];
mp_load_method(MP_STATE_VM(dupterm_objs[idx]), MP_QSTR_read, read_m);
read_m[2] = MP_OBJ_NEW_SMALL_INT(1);
mp_obj_t res = mp_call_method_n_kw(1, 0, read_m);
if (res == mp_const_none) {
return -2;
}
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(res, &bufinfo, MP_BUFFER_READ);
if (bufinfo.len == 0) {
mp_printf(&mp_plat_print, "dupterm: EOF received, deactivating\n");
MP_STATE_VM(dupterm_objs[idx]) = MP_OBJ_NULL;
return -1;
}
nlr_pop();
return *(byte *)bufinfo.buf;
} else {
// Temporarily disable dupterm to avoid infinite recursion
mp_obj_t save_term = MP_STATE_VM(dupterm_objs[idx]);
MP_STATE_VM(dupterm_objs[idx]) = NULL;
mp_printf(&mp_plat_print, "dupterm: ");
mp_obj_print_exception(&mp_plat_print, nlr.ret_val);
MP_STATE_VM(dupterm_objs[idx]) = save_term;
}
return -1;
}
#endif
int mp_hal_stdin_rx_chr(void) {
#if MICROPY_PY_OS_DUPTERM
// TODO only support dupterm one slot at the moment
if (MP_STATE_VM(dupterm_objs[0]) != MP_OBJ_NULL) {
int c;
do {
c = call_dupterm_read(0);
} while (c == -2);
if (c == -1) {
goto main_term;
}
if (c == '\n') {
c = '\r';
}
return c;
}
main_term:;
#endif
unsigned char c;
ssize_t ret;
MP_HAL_RETRY_SYSCALL(ret, read(STDIN_FILENO, &c, 1), {});
if (ret == 0) {
c = 4; // EOF, ctrl-D
} else if (c == '\n') {
c = '\r';
}
return c;
}
void mp_hal_stdout_tx_strn(const char *str, size_t len) {
ssize_t ret;
MP_HAL_RETRY_SYSCALL(ret, write(STDOUT_FILENO, str, len), {});
// CIRCUITPY-CHANGE: need to conditionalize MICROPY_PY_OS_DUPTERM
#if MICROPY_PY_OS_DUPTERM
mp_os_dupterm_tx_strn(str, len);
#endif
}
// cooked is same as uncooked because the terminal does some postprocessing
void mp_hal_stdout_tx_strn_cooked(const char *str, size_t len) {
mp_hal_stdout_tx_strn(str, len);
}
void mp_hal_stdout_tx_str(const char *str) {
mp_hal_stdout_tx_strn(str, strlen(str));
}
#ifndef mp_hal_ticks_ms
mp_uint_t mp_hal_ticks_ms(void) {
#if (defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0) && defined(_POSIX_MONOTONIC_CLOCK)
struct timespec tv;
clock_gettime(CLOCK_MONOTONIC, &tv);
return tv.tv_sec * 1000 + tv.tv_nsec / 1000000;
#else
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec * 1000 + tv.tv_usec / 1000;
#endif
}
#endif
#ifndef mp_hal_ticks_us
mp_uint_t mp_hal_ticks_us(void) {
#if (defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0) && defined(_POSIX_MONOTONIC_CLOCK)
struct timespec tv;
clock_gettime(CLOCK_MONOTONIC, &tv);
return tv.tv_sec * 1000000 + tv.tv_nsec / 1000;
#else
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec * 1000000 + tv.tv_usec;
#endif
}
#endif
#ifndef mp_hal_time_ns
uint64_t mp_hal_time_ns(void) {
struct timeval tv;
gettimeofday(&tv, NULL);
return (uint64_t)tv.tv_sec * 1000000000ULL + (uint64_t)tv.tv_usec * 1000ULL;
}
#endif
#ifndef mp_hal_delay_ms
void mp_hal_delay_ms(mp_uint_t ms) {
#ifdef MICROPY_EVENT_POLL_HOOK
mp_uint_t start = mp_hal_ticks_ms();
while (mp_hal_ticks_ms() - start < ms) {
// MICROPY_EVENT_POLL_HOOK does usleep(500).
MICROPY_EVENT_POLL_HOOK
}
#else
// TODO: POSIX et al. define usleep() as guaranteedly capable only of 1s sleep:
// "The useconds argument shall be less than one million."
usleep(ms * 1000);
#endif
}
#endif
void mp_hal_get_random(size_t n, void *buf) {
#ifdef _HAVE_GETRANDOM
RAISE_ERRNO(getrandom(buf, n, 0), errno);
#else
int fd = open("/dev/random", O_RDONLY);
RAISE_ERRNO(fd, errno);
RAISE_ERRNO(read(fd, buf, n), errno);
close(fd);
#endif
}
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