fix: add format attribute to relevant functions (-Wsuggest-attribute=format)

[lttng-ust.git] / doc / examples / demo-tracelog / demo-vtracelog.c

/*
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 * Copyright (C) 2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

#include <lttng/tracelog.h>

__attribute__((format(printf, 1, 2)))
void print_err(const char* msg, ...)
{
	va_list ap;

	va_start(ap, msg);
	vtracelog(TRACE_ERR, msg, ap);
	va_end(ap);
}

int main(int argc, char **argv)
{
	int i;
	int delay = 0;
	const char *str = "mystring test";
	long l = 0x42;

	if (argc > 2)
		delay = atoi(argv[1]);

	fprintf(stderr, "Demo program starting.\n");

	sleep(delay);

	fprintf(stderr, "Tracing... ");

	for (i = 0; i < 5; i++) {
		print_err("This is a \"%s\" formatted %d error event %lx", str, i, l);
	}

	fprintf(stderr, " done.\n");
	return 0;
}