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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2012-04-04 15:36:02 +0200
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2012-04-17 00:14:17 +0200
commit30b23e261a3b02f548c834dee9d2e5cda0f1de32 (patch)
tree3fa681def26c65b9370fceac6a3d6724ab26c663 /LICENSE
parentea119529c7ba3f042d227209c5669163916f6b4b (diff)
events: Stop dispatching events immediately when requested to stop
Otherwise events received but not yet dispatched are dispatched and can call hangs in ioctls as the pipeline has likely been stopped. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Diffstat (limited to 'LICENSE')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.3 (git 2.25.1) at 2025-09-13 16:12:20 +0000
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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * UVC gadget test application
 *
 * Copyright (C) 2010-2018 Laurent Pinchart
 *
 * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 */

#include <signal.h>
#include <stdio.h>
#include <unistd.h>

#include "configfs.h"
#include "events.h"
#include "stream.h"
#include "v4l2-source.h"

static void usage(const char *argv0)
{
	fprintf(stderr, "Usage: %s [options] <uvc device>\n", argv0);
	fprintf(stderr, "Available options are\n");
	fprintf(stderr, " -c device	V4L2 source device\n");
	fprintf(stderr, " -i image	MJPEG image\n");
	fprintf(stderr, " -h		Print this help screen and exit\n");
	fprintf(stderr, "\n");
	fprintf(stderr, " <uvc device>	UVC device instance specifier\n");
	fprintf(stderr, "\n");

	fprintf(stderr, "  For ConfigFS devices the <uvc device> parameter can take the form of a shortened\n");
	fprintf(stderr, "  function specifier such as: 'uvc.0', or if multiple gadgets are configured, the\n");
	fprintf(stderr, "  gadget name should be included to prevent ambiguity: 'g1/functions/uvc.0'.\n");
	fprintf(stderr, "\n");
	fprintf(stderr, "  For legacy g_webcam UVC instances, this parameter will identify the UDC that the\n");
	fprintf(stderr, "  UVC function is bound to.\n");
	fprintf(stderr, "\n");
	fprintf(stderr, "  The parameter is optional, and if not provided the first UVC function on the first\n");
	fprintf(stderr, "  gadget identified will be used.\n");
	fprintf(stderr, "\n");
	fprintf(stderr, "Example usage:\n");
	fprintf(stderr, "    %s uvc.1\n", argv0);
	fprintf(stderr, "    %s g1/functions/uvc.1\n", argv0);
	fprintf(stderr, "\n");
	fprintf(stderr, "    %s musb-hdrc.0.auto\n", argv0);
}

/* Necessary for and only used by signal handler. */
static struct events *sigint_events;

static void sigint_handler(int signal)
{
	/* Stop the main loop when the user presses CTRL-C */
	events_stop(sigint_events);
}

int main(int argc, char *argv[])
{
	char *function = NULL;
	char *cap_device = "/dev/video1";
	struct uvc_function_config *fc;
	struct uvc_stream *stream = NULL;
	struct video_source *src = NULL;
	struct events events;
	int ret = 0;
	int opt;

	while ((opt = getopt(argc, argv, "c:h")) != -1) {
		switch (opt) {
		case 'c':
			cap_device = optarg;
			break;

		case 'h':
			usage(argv[0]);
			return 0;

		default:
			fprintf(stderr, "Invalid option '-%c'\n", opt);
			usage(argv[0]);
			return 1;
		}
	}

	if (argv[optind] != NULL)
		function = argv[optind];

	fc = configfs_parse_uvc_function(function);
	if (!fc) {
		printf("Failed to identify function configuration\n");
		return 1;
	}

	/*
	 * Create the events handler. Register a signal handler for SIGINT,
	 * received when the user presses CTRL-C. This will allow the main loop
	 * to be interrupted, and resources to be freed cleanly.
	 */
	events_init(&events);