drivers/console/native_posix_console.c

/*
 * Copyright (c) 2017 Oticon A/S
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <stdio.h>
#include "init.h"

/**
 *
 * @brief Initialize the driver that provides the printk output
 *
 * @return 0 if successful, otherwise failed.
 */
static int printk_init(struct device *arg)
{
	ARG_UNUSED(arg);

	/* Let's ensure that even if we are redirecting to a file, we get stdout
	 * and stderr line buffered (default for console). Note that glibc
	 * ignores size. But just in case we set a reasonable number in case
	 * somebody tries to compile against a different library
	 */
	setvbuf(stdout, NULL, _IOLBF, 512);
	setvbuf(stderr, NULL, _IOLBF, 512);

	extern void __printk_hook_install(int (*fn)(int));
	__printk_hook_install(putchar);

	return 0;
}

SYS_INIT(printk_init, PRE_KERNEL_1, CONFIG_NATIVE_POSIX_CONSOLE_INIT_PRIORITY);