// SPDX-License-Identifier: GPL-2.0

//

// waiter-poll.c - Waiter for event notification by poll(2).

//

// Copyright (c) 2018 Takashi Sakamoto <o-takashi@sakamocchi.jp>

//

// Licensed under the terms of the GNU General Public License, version 2.

#include "waiter.h"

#include "misc.h"

#include <stdlib.h>

#include <errno.h>

#include <poll.h>

static int poll_prepare(struct waiter_context *waiter)

{

	// Nothing to do because an instance of waiter has required data.

	return 0;

}

static int poll_wait_event(struct waiter_context *waiter, int timeout_msec)

{

	int err;

	err = poll(waiter->pfds, waiter->pfd_count, timeout_msec);

	if (err < 0)

		return -errno;

	return err;

}

static void poll_release(struct waiter_context *waiter)

{

	// Nothing to do because an instance of waiter has required data.

	return;

}

const struct waiter_data waiter_poll = {

	.ops = {

		.prepare	= poll_prepare,

		.wait_event	= poll_wait_event,

		.release	= poll_release,

	},

};