util.c

/*
 * Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "util.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>


void daemonize()
{
	pid_t pid;
	int fd;

	pid = fork();
	if (pid == -1)
		return;
	else if (pid != 0)
		exit(EXIT_SUCCESS);

	if (setsid() == -1)
		return;

	// Re-direct stderr/stdout to the system message log
	close(0);
	close(1);
	close(2);

	open("/dev/kmsg", O_RDWR);

	fd = dup(0);
	if (fd != STDOUT_FILENO) {
		close(fd);
		return;
	}
	fd = dup(0);
	if (fd != STDERR_FILENO) {
		close(fd);
		return;
	}
}

#ifdef __clang__
__attribute__((format (__printf__, 2, 0)))
#endif
void LOG(int severity, const char* fmt, ...)
{
	va_list arg_list;
	fprintf(stderr, "frecon: ");
	va_start( arg_list, fmt);
	vfprintf(stderr, fmt, arg_list);
	va_end(arg_list);
	fprintf(stderr, "\n");
}