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/*

* This file is part of the Micro Python project, http://micropython.org/

*

* The MIT License (MIT)

*

* Copyright (c) 2014 Damien P. George

* Copyright (c) 2015 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

#include <stdio.h>

#include <errno.h>

#include <poll.h>

#include "py/nlr.h"

#include "py/obj.h"

#include "py/objlist.h"

#include "py/objtuple.h"

#include "py/mphal.h"

// 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_poll_t;

/// \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]);

int fd = mp_obj_get_int(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);

self->alloc += 4;

}

free_slot = &self->entries[self->len++];

}

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 = mp_obj_get_int(obj_in);

for (int i = self->len - 1; i >= 0; i--) {

if (entries->fd == fd) {

entries->fd = -1;

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 = mp_obj_get_int(obj_in);

for (int i = self->len - 1; i >= 0; i--) {

if (entries->fd == fd) {

entries->events = mp_obj_get_int(eventmask_in);

break;

}

entries++;

}

// TODO raise KeyError if obj didn't exist in map

return mp_const_none;

}

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) {

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]);

}

}

int n_ready = poll(self->entries, self->len, timeout);

RAISE_ERRNO(n_ready, errno);

if (n_ready == 0) {

return mp_const_empty_tuple;

}

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));

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 (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 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) },

};

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,

.locals_dict = (void*)&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 = m_new_obj(mp_obj_poll_t);

poll->base.type = &mp_type_poll;

poll->entries = m_new(struct pollfd, alloc);

poll->alloc = alloc;

poll->len = 0;

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 },

.name = MP_QSTR_uselect,

.globals = (mp_obj_dict_t*)&mp_module_select_globals,

};

#endif // MICROPY_PY_USELECT