// SPDX-License-Identifier: GPL-2.0/* * This tool is used by the utimer test, and it allows us to * count the ticks of a global timer in a certain time frame * (which is set by `timeout` parameter). * * Author: Ivan Orlov <ivan.orlov0322@gmail.com> */#include <stdio.h>#include <stdlib.h>#include <alsa/asoundlib.h>#include <time.h> static int ticked;static void async_callback(snd_async_handler_t *ahandler){	ticked++;} static char timer_name[64];static void bind_to_timer(int device, int subdevice, int timeout){	snd_timer_t *handle;	snd_timer_params_t *params;	snd_async_handler_t *ahandler; 	time_t end; 	sprintf(timer_name, "hw:CLASS=%d,SCLASS=%d,DEV=%d,SUBDEV=%d",		SND_TIMER_CLASS_GLOBAL, SND_TIMER_SCLASS_NONE,		device, subdevice); 	snd_timer_params_alloca(&params); 	if (snd_timer_open(&handle, timer_name, SND_TIMER_OPEN_NONBLOCK) < 0) {		perror("Can't open the timer");		exit(EXIT_FAILURE);	} 	snd_timer_params_set_auto_start(params, 1);	snd_timer_params_set_ticks(params, 1);	if (snd_timer_params(handle, params) < 0) {		perror("Can't set timer params");		exit(EXIT_FAILURE);	} 	if (snd_async_add_timer_handler(&ahandler, handle, async_callback, NULL) < 0) {		perror("Can't create a handler");		exit(EXIT_FAILURE);	}	end = time(NULL) + timeout;	if (snd_timer_start(handle) < 0) {		perror("Failed to start the timer");		exit(EXIT_FAILURE);	}	printf("Timer has started\n");	while (time(NULL) <= end) {		/*		 * Waiting for the timeout to elapse. Can't use sleep here, as it gets		 * constantly interrupted by the signal from the timer (SIGIO)		 */	}	snd_timer_stop(handle);	snd_timer_close(handle);} int main(int argc, char *argv[]){	int device, subdevice, timeout; 	if (argc < 4) {		perror("Usage: %s <device> <subdevice> <timeout>");		return EXIT_FAILURE;	} 	setlinebuf(stdout); 	device = atoi(argv[1]);	subdevice = atoi(argv[2]);	timeout = atoi(argv[3]); 	bind_to_timer(device, subdevice, timeout); 	printf("Total ticks count: %d\n", ticked); 	return EXIT_SUCCESS;}