alsa-utils/axfer/waiter-poll.c

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// 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 ATTRIBUTE_UNUSED)
{
// 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 ATTRIBUTE_UNUSED)
{
// 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,
},
};