Blame test/timer.c

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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/time.h>
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#include "../include/asoundlib.h"
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void show_status(void *handle)
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{
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	int err;
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	snd_timer_status_t *status;
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	snd_timer_status_alloca(&status);
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	if ((err = snd_timer_status(handle, status)) < 0) {
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		fprintf(stderr, "timer status %i (%s)\n", err, snd_strerror(err));
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		return;
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	}
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	printf("STATUS:\n");
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	printf("  resolution = %li\n", snd_timer_status_get_resolution(status));
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	printf("  lost = %li\n", snd_timer_status_get_lost(status));
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	printf("  overrun = %li\n", snd_timer_status_get_overrun(status));
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	printf("  queue = %li\n", snd_timer_status_get_queue(status));
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}
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void read_loop(void *handle, int master_ticks, int timeout)
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{
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	int count, err;
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	struct pollfd *fds;
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	snd_timer_read_t tr;
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	count = snd_timer_poll_descriptors_count(handle);
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	fds = calloc(count, sizeof(struct pollfd));
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	if (fds == NULL) {
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		fprintf(stderr, "malloc error\n");
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		exit(EXIT_FAILURE);
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	}
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	while (master_ticks-- > 0) {
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		if ((err = snd_timer_poll_descriptors(handle, fds, count)) < 0) {
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			fprintf(stderr, "snd_timer_poll_descriptors error: %s\n", snd_strerror(err));
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			exit(EXIT_FAILURE);
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		}
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		if ((err = poll(fds, count, timeout)) < 0) {
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			fprintf(stderr, "poll error %i (%s)\n", err, strerror(err));
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			exit(EXIT_FAILURE);
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		}
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		if (err == 0) {
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			fprintf(stderr, "timer time out!!\n");
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			exit(EXIT_FAILURE);
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		}
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		while (snd_timer_read(handle, &tr, sizeof(tr)) == sizeof(tr)) {
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			printf("TIMER: resolution = %uns, ticks = %u\n",
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				tr.resolution, tr.ticks);
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		}
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	}
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	free(fds);
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}
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static void async_callback(snd_async_handler_t *ahandler)
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{
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	snd_timer_t *handle = snd_async_handler_get_timer(ahandler);
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	int *acount = snd_async_handler_get_callback_private(ahandler);
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	snd_timer_read_t tr;
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	while (snd_timer_read(handle, &tr, sizeof(tr)) == sizeof(tr)) {
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		printf("TIMER: resolution = %uns, ticks = %u\n",
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			tr.resolution, tr.ticks);
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	}
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	(*acount)++;
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}
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int main(int argc, char *argv[])
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{
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	int idx, err;
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	int class = SND_TIMER_CLASS_GLOBAL;
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	int sclass = SND_TIMER_CLASS_NONE;
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	int card = 0;
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	int device = SND_TIMER_GLOBAL_SYSTEM;
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	int subdevice = 0;
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	int list = 0;
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	int async = 0;
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	int acount = 0;
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	snd_timer_t *handle;
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	snd_timer_id_t *id;
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	snd_timer_info_t *info;
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	snd_timer_params_t *params;
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	char timername[64];
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	snd_async_handler_t *ahandler;
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	snd_timer_id_alloca(&id;;
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	snd_timer_info_alloca(&info;;
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	snd_timer_params_alloca(&params);
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	idx = 1;
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	while (idx < argc) {
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		if (!strncmp(argv[idx], "class=", 5)) {
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			class = atoi(argv[idx]+6);
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		} else if (!strncmp(argv[idx], "sclass=", 6)) {
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			sclass = atoi(argv[idx]+7);
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		} else if (!strncmp(argv[idx], "card=", 5)) {
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			card = atoi(argv[idx]+5);
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		} else if (!strncmp(argv[idx], "device=", 7)) {
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			device = atoi(argv[idx]+7);
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		} else if (!strncmp(argv[idx], "subdevice=", 10)) {
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			subdevice = atoi(argv[idx]+10);
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		} else if (!strcmp(argv[idx], "list")) {
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			list = 1;
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		} else if (!strcmp(argv[idx], "async")) {
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			async = 1;
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		}
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		idx++;
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	}
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	if (class == SND_TIMER_CLASS_SLAVE && sclass == SND_TIMER_SCLASS_NONE) {
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		fprintf(stderr, "slave class is not set\n");
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		exit(EXIT_FAILURE);
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	}
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	if (list) {
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		snd_timer_query_t *qhandle;
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		if ((err = snd_timer_query_open(&qhandle, "hw", 0)) < 0) {
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			fprintf(stderr, "snd_timer_query_open error: %s\n", snd_strerror(err));
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			exit(EXIT_FAILURE);
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		}
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		snd_timer_id_set_class(id, SND_TIMER_CLASS_NONE);
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		while (1) {
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			if ((err = snd_timer_query_next_device(qhandle, id)) < 0) {
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				fprintf(stderr, "timer next device error: %s\n", snd_strerror(err));
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				break;
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			}
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			if (snd_timer_id_get_class(id) < 0)
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				break;
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			printf("Timer device: class %i, sclass %i, card %i, device %i, subdevice %i\n",
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					snd_timer_id_get_class(id),
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					snd_timer_id_get_sclass(id),
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					snd_timer_id_get_card(id),
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					snd_timer_id_get_device(id),
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					snd_timer_id_get_subdevice(id));
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		}
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		snd_timer_query_close(qhandle);
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		exit(EXIT_SUCCESS);
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	}
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	sprintf(timername, "hw:CLASS=%i,SCLASS=%i,CARD=%i,DEV=%i,SUBDEV=%i", class, sclass, card, device, subdevice);
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	if ((err = snd_timer_open(&handle, timername, SND_TIMER_OPEN_NONBLOCK))<0) {
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		fprintf(stderr, "timer open %i (%s)\n", err, snd_strerror(err));
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		exit(EXIT_FAILURE);
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	}
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	printf("Using timer class %i, slave class %i, card %i, device %i, subdevice %i\n", class, sclass, card, device, subdevice);
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	if ((err = snd_timer_info(handle, info)) < 0) {
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		fprintf(stderr, "timer info %i (%s)\n", err, snd_strerror(err));
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		exit(0);
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	}
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	printf("Timer info:\n");
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	printf("  slave = %s\n", snd_timer_info_is_slave(info) ? "yes" : "no");
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	printf("  card = %i\n", snd_timer_info_get_card(info));
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	printf("  id = '%s'\n", snd_timer_info_get_id(info));
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	printf("  name = '%s'\n", snd_timer_info_get_name(info));
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	printf("  average resolution = %li\n", snd_timer_info_get_resolution(info));
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	snd_timer_params_set_auto_start(params, 1);
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	if (!snd_timer_info_is_slave(info)) {
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		snd_timer_params_set_ticks(params, (1000000000 / snd_timer_info_get_resolution(info)) / 50); /* 50Hz */
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		if (snd_timer_params_get_ticks(params) < 1)
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			snd_timer_params_set_ticks(params, 1);
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		printf("Using %li tick(s)\n", snd_timer_params_get_ticks(params));
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	} else {
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		snd_timer_params_set_ticks(params, 1);
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	}
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	if ((err = snd_timer_params(handle, params)) < 0) {
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		fprintf(stderr, "timer params %i (%s)\n", err, snd_strerror(err));
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		exit(0);
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	}
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	show_status(handle);
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	if (async) {
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		err = snd_async_add_timer_handler(&ahandler, handle, async_callback, &acount);
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		if (err < 0) {
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			fprintf(stderr, "unable to add async handler %i (%s)\n", err, snd_strerror(err));
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			exit(EXIT_FAILURE);
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		}
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	}
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	if ((err = snd_timer_start(handle)) < 0) {
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		fprintf(stderr, "timer start %i (%s)\n", err, snd_strerror(err));
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		exit(EXIT_FAILURE);
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	}
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	if (async) {
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		/* because all other work is done in the signal handler,
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		   suspend the process */
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		while (acount < 25)
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			sleep(1);
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		snd_timer_stop(handle);
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	} else {
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		read_loop(handle, 25, snd_timer_info_is_slave(info) ? 10000 : 25);
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	}
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	show_status(handle);
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	snd_timer_close(handle);
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	printf("Done\n");
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	return EXIT_SUCCESS;
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}