mirror of
https://github.com/alsa-project/alsa-utils
synced 2024-09-19 17:49:59 +02:00
1521e01550
This commit adds support of waiter for poll(2) system call. Below lines are examples to use this option: $ axfer transfer --waiter-type=poll -M -P -d 2 -D hw:0,3 /dev/urandom -f dat -vvv $ axfer transfer --waiter-type=poll -M -C -d 2 -D hw:1,0 /dev/null -r 48000 -vvv Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
46 lines
960 B
C
46 lines
960 B
C
// 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,
|
|
},
|
|
};
|