/*

 * Copyright (C) 2019 by Sukchan Lee <acetcom@gmail.com>

 *

 * This file is part of Open5GS.

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU Affero General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <https://www.gnu.org/licenses/>.

 */

#include "core-config-private.h"

#include "ogs-core.h"

#include "ogs-poll-private.h"

extern const ogs_pollset_actions_t ogs_kqueue_actions;

extern const ogs_pollset_actions_t ogs_epoll_actions;

extern const ogs_pollset_actions_t ogs_select_actions;

static void *self_handler_data = NULL;

ogs_pollset_actions_t ogs_pollset_actions;

bool ogs_pollset_actions_initialized = false;

ogs_pollset_t *ogs_pollset_create(unsigned int capacity)

{

    ogs_pollset_t *pollset = ogs_calloc(1, sizeof *pollset);

    if (!pollset) {

        ogs_error("ogs_calloc() failed");

        return NULL;

    }

    pollset->capacity = capacity;

    ogs_pool_init(&pollset->pool, capacity);

    if (ogs_pollset_actions_initialized == false) {

#if defined(HAVE_KQUEUE)

        ogs_pollset_actions = ogs_kqueue_actions;

#elif defined(HAVE_EPOLL)

        ogs_pollset_actions = ogs_epoll_actions;

#else

        ogs_pollset_actions = ogs_select_actions;

#endif

        ogs_pollset_actions_initialized = true;

    }

    ogs_pollset_actions.init(pollset);

    return pollset;

}

void ogs_pollset_destroy(ogs_pollset_t *pollset)

{

    ogs_assert(pollset);

    ogs_pollset_actions.cleanup(pollset);

    ogs_pool_final(&pollset->pool);

    ogs_free(pollset);

}

ogs_poll_t *ogs_pollset_add(ogs_pollset_t *pollset, short when,

        ogs_socket_t fd, ogs_poll_handler_f handler, void *data)

{

    ogs_poll_t *poll = NULL;

    int rc;

    ogs_assert(pollset);

    ogs_assert(fd != INVALID_SOCKET);

    ogs_assert(handler);

    ogs_pool_alloc(&pollset->pool, &poll);

    ogs_assert(poll);

    rc = ogs_nonblocking(fd);

    ogs_assert(rc == OGS_OK);

    rc = ogs_closeonexec(fd);

    ogs_assert(rc == OGS_OK);

    poll->when = when;

    poll->fd = fd;

    poll->handler = handler;

    if (data == &self_handler_data)

        poll->data = poll;

    else

        poll->data = data;

    poll->pollset = pollset;

    rc = ogs_pollset_actions.add(poll);

    if (rc != OGS_OK) {

        ogs_error("cannot add poll");

        ogs_pool_free(&pollset->pool, poll);

        return NULL;

    }

    return poll;

}

void ogs_pollset_remove(ogs_poll_t *poll)

{

    int rc;

    ogs_pollset_t *pollset = NULL;

    ogs_assert(poll);

    pollset = poll->pollset;

    ogs_assert(pollset);

    rc = ogs_pollset_actions.remove(poll);

    if (rc != OGS_OK) {

        ogs_error("cannot delete poll");

    }

    ogs_pool_free(&pollset->pool, poll);

}

void *ogs_pollset_self_handler_data(void)

{

    return &self_handler_data;

}