1// SPDX-License-Identifier: GPL-2.0
2//
3// waiter-poll.c - Waiter for event notification by poll(2).
4//
5// Copyright (c) 2018 Takashi Sakamoto <o-takashi@sakamocchi.jp>
6//
7// Licensed under the terms of the GNU General Public License, version 2.
8
9#include "waiter.h"
10#include "misc.h"
11
12#include <stdlib.h>
13#include <errno.h>
14#include <poll.h>
15
16static int poll_prepare(struct waiter_context *waiter ATTRIBUTE_UNUSED)
17{
18	// Nothing to do because an instance of waiter has required data.
19	return 0;
20}
21
22static int poll_wait_event(struct waiter_context *waiter, int timeout_msec)
23{
24	int err;
25
26	err = poll(waiter->pfds, waiter->pfd_count, timeout_msec);
27	if (err < 0)
28		return -errno;
29
30	return err;
31}
32
33static void poll_release(struct waiter_context *waiter ATTRIBUTE_UNUSED)
34{
35	// Nothing to do because an instance of waiter has required data.
36	return;
37}
38
39const struct waiter_data waiter_poll = {
40	.ops = {
41		.prepare	= poll_prepare,
42		.wait_event	= poll_wait_event,
43		.release	= poll_release,
44	},
45};
46