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micropython/ports/unix/moduselect.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2014 Damien P. George
* 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
* 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 "py/mpconfig.h"
#if MICROPY_PY_USELECT_POSIX
#if MICROPY_PY_USELECT
#error "Can't have both MICROPY_PY_USELECT and MICROPY_PY_USELECT_POSIX."
#endif
#include <stdio.h>
#include <errno.h>
#include <poll.h>
#include "py/runtime.h"
#include "py/stream.h"
#include "py/obj.h"
#include "py/objlist.h"
#include "py/objtuple.h"
#include "py/mphal.h"
#include "py/mpthread.h"
#define DEBUG 0
#if MICROPY_PY_SOCKET
extern const mp_obj_type_t mp_type_socket;
#endif
// Flags for poll()
#define FLAG_ONESHOT (1)
/// \class Poll - poll class
typedef struct _mp_obj_poll_t {
mp_obj_base_t base;
unsigned short alloc;
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) {
if (mp_obj_is_obj(fdlike)) {
const mp_stream_p_t *stream_p = mp_get_stream_raise(fdlike, MP_STREAM_OP_IOCTL);
int err;
mp_uint_t res = stream_p->ioctl(fdlike, MP_STREAM_GET_FILENO, 0, &err);
if (res != MP_STREAM_ERROR) {
return res;
}
}
return mp_obj_get_int(fdlike);
}
/// \method register(obj[, eventmask])
STATIC mp_obj_t poll_register(size_t n_args, const mp_obj_t *args) {
mp_obj_poll_t *self = MP_OBJ_TO_PTR(args[0]);
bool is_fd = mp_obj_is_int(args[1]);
int fd = get_fd(args[1]);
mp_uint_t flags;
if (n_args == 3) {
flags = mp_obj_get_int(args[2]);
} else {
flags = POLLIN | POLLOUT;
}
struct pollfd *free_slot = NULL;
struct pollfd *entry = self->entries;
for (int i = 0; i < self->len; i++, entry++) {
int entry_fd = entry->fd;
if (entry_fd == fd) {
entry->events = flags;
return mp_const_false;
}
if (entry_fd == -1) {
free_slot = entry;
}
}
if (free_slot == NULL) {
if (self->len >= self->alloc) {
self->entries = m_renew(struct pollfd, self->entries, self->alloc, self->alloc + 4);
if (self->obj_map) {
self->obj_map = m_renew(mp_obj_t, self->obj_map, self->alloc, self->alloc + 4);
}
self->alloc += 4;
}
free_slot = &self->entries[self->len++];
}
if (!is_fd) {
if (self->obj_map == NULL) {
self->obj_map = m_new0(mp_obj_t, self->alloc);
}
self->obj_map[free_slot - self->entries] = args[1];
}
free_slot->fd = fd;
free_slot->events = flags;
free_slot->revents = 0;
return mp_const_true;
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(poll_register_obj, 2, 3, poll_register);
/// \method unregister(obj)
STATIC mp_obj_t poll_unregister(mp_obj_t self_in, mp_obj_t obj_in) {
mp_obj_poll_t *self = MP_OBJ_TO_PTR(self_in);
struct pollfd *entries = self->entries;
int fd = get_fd(obj_in);
for (int i = self->len - 1; i >= 0; i--) {
if (entries->fd == fd) {
entries->fd = -1;
if (self->obj_map) {
self->obj_map[entries - self->entries] = MP_OBJ_NULL;
}
break;
}
entries++;
}
// TODO raise KeyError if obj didn't exist in map
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_2(poll_unregister_obj, poll_unregister);
/// \method modify(obj, eventmask)
STATIC mp_obj_t poll_modify(mp_obj_t self_in, mp_obj_t obj_in, mp_obj_t eventmask_in) {
mp_obj_poll_t *self = MP_OBJ_TO_PTR(self_in);
struct pollfd *entries = self->entries;
int fd = get_fd(obj_in);
for (int i = self->len - 1; i >= 0; i--) {
if (entries->fd == fd) {
entries->events = mp_obj_get_int(eventmask_in);
return mp_const_none;
}
entries++;
}
// obj doesn't exist in poller
mp_raise_OSError(MP_ENOENT);
}
MP_DEFINE_CONST_FUN_OBJ_3(poll_modify_obj, poll_modify);
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)
int timeout = -1;
int flags = 0;
if (n_args >= 2) {
if (args[1] != mp_const_none) {
mp_int_t timeout_i = mp_obj_get_int(args[1]);
if (timeout_i >= 0) {
timeout = timeout_i;
}
}
if (n_args >= 3) {
flags = mp_obj_get_int(args[2]);
}
}
self->flags = flags;
int n_ready;
MP_HAL_RETRY_SYSCALL(n_ready, poll(self->entries, self->len, timeout), mp_raise_OSError(err));
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;
for (int i = 0; i < self->len; i++, entries++) {
if (entries->revents != 0) {
mp_obj_tuple_t *t = MP_OBJ_TO_PTR(mp_obj_new_tuple(2, NULL));
// 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);
ret_list->items[ret_i++] = MP_OBJ_FROM_PTR(t);
if (self->flags & FLAG_ONESHOT) {
entries->events = 0;
}
}
}
return MP_OBJ_FROM_PTR(ret_list);
}
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;
}
#if DEBUG
STATIC mp_obj_t poll_dump(mp_obj_t self_in) {
mp_obj_poll_t *self = MP_OBJ_TO_PTR(self_in);
struct pollfd *entries = self->entries;
for (int i = self->len - 1; i >= 0; i--) {
printf("fd: %d ev: %x rev: %x", entries->fd, entries->events, entries->revents);
if (self->obj_map) {
printf(" obj: %p", self->obj_map[entries - self->entries]);
}
printf("\n");
entries++;
}
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_1(poll_dump_obj, poll_dump);
#endif
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) },
#if DEBUG
{ MP_ROM_QSTR(MP_QSTR_dump), MP_ROM_PTR(&poll_dump_obj) },
#endif
};
STATIC MP_DEFINE_CONST_DICT(poll_locals_dict, poll_locals_dict_table);
STATIC MP_DEFINE_CONST_OBJ_TYPE(
mp_type_poll,
MP_QSTR_poll,
MP_TYPE_FLAG_ITER_IS_ITERNEXT,
MP_TYPE_NULL_MAKE_NEW,
iter, poll_iternext,
locals_dict, &poll_locals_dict
);
STATIC mp_obj_t select_poll(size_t n_args, const mp_obj_t *args) {
int alloc = 4;
if (n_args > 0) {
alloc = mp_obj_get_int(args[0]);
}
mp_obj_poll_t *poll = mp_obj_malloc(mp_obj_poll_t, &mp_type_poll);
poll->entries = m_new(struct pollfd, alloc);
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);
STATIC const mp_rom_map_elem_t mp_module_select_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_uselect) },
{ MP_ROM_QSTR(MP_QSTR_poll), MP_ROM_PTR(&mp_select_poll_obj) },
{ MP_ROM_QSTR(MP_QSTR_POLLIN), MP_ROM_INT(POLLIN) },
{ MP_ROM_QSTR(MP_QSTR_POLLOUT), MP_ROM_INT(POLLOUT) },
{ MP_ROM_QSTR(MP_QSTR_POLLERR), MP_ROM_INT(POLLERR) },
{ MP_ROM_QSTR(MP_QSTR_POLLHUP), MP_ROM_INT(POLLHUP) },
};
STATIC MP_DEFINE_CONST_DICT(mp_module_select_globals, mp_module_select_globals_table);
const mp_obj_module_t mp_module_uselect = {
.base = { &mp_type_module },
.globals = (mp_obj_dict_t *)&mp_module_select_globals,
};
MP_REGISTER_MODULE(MP_QSTR_uselect, mp_module_uselect);
#endif // MICROPY_PY_USELECT_POSIX
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