///////////////////////////////////////////////////////////////////////////////
//
//                          IMPORTANT NOTICE
//
// The following open source license statement does not apply to any
// entity in the Exception List published by FMSoft.
//
// For more information, please visit:
//
// https://www.fmsoft.cn/exception-list
//
//////////////////////////////////////////////////////////////////////////////
/*
 *   This file is part of MiniGUI, a mature cross-platform windowing 
 *   and Graphics User Interface (GUI) support system for embedded systems
 *   and smart IoT devices.
 * 
 *   Copyright (C) 2002~2018, Beijing FMSoft Technologies Co., Ltd.
 *   Copyright (C) 1998~2002, WEI Yongming
 * 
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 * 
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 * 
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 *   Or,
 * 
 *   As this program is a library, any link to this program must follow
 *   GNU General Public License version 3 (GPLv3). If you cannot accept
 *   GPLv3, you need to be licensed from FMSoft.
 * 
 *   If you have got a commercial license of this program, please use it
 *   under the terms and conditions of the commercial license.
 * 
 *   For more information about the commercial license, please refer to
 *   <http://www.minigui.com/blog/minigui-licensing-policy/>.
 */
/* 
** errorlog.c: Error routines for programs that can run as a daemon.
**
** Some code come from APUE by Richard Stevens.
**
** Current maintainer: Wei Yongming.
** Create date: 2000.12.31
*/

#include	<stdarg.h>		/* ANSI C header file */
#include	<errno.h>		/* for definition of errno */

#include	"common.h"

#ifdef _MGRM_PROCESSES

#include	<syslog.h>

#ifdef _DEBUG
#include	"ourhdr.h"

static void	log_doit(int, int, const char *, va_list ap);

static int debug = 0;	/* caller must define and set this:
						   nonzero if interactive, zero if daemon */

/* Initialize syslog(), if running as daemon. */

void
log_open(const char *ident, int option, int facility)
{
	if (debug == 0)
		openlog(ident, option, facility);
}

/* Nonfatal error related to a system call.
 * Print a message with the system's errno value and return. */

void
log_ret(const char *fmt, ...)
{
	va_list		ap;

	va_start(ap, fmt);
	log_doit(1, LOG_ERR, fmt, ap);
	va_end(ap);
	return;
}

/* Fatal error related to a system call.
 * Print a message and terminate. */

void
log_sys(const char *fmt, ...)
{
	va_list		ap;

	va_start(ap, fmt);
	log_doit(1, LOG_ERR, fmt, ap);
	va_end(ap);
	exit(2);
}

/* Nonfatal error unrelated to a system call.
 * Print a message and return. */

void
log_msg(const char *fmt, ...)
{
	va_list		ap;

	va_start(ap, fmt);
	log_doit(0, LOG_ERR, fmt, ap);
	va_end(ap);
	return;
}

/* Fatal error unrelated to a system call.
 * Print a message and terminate. */

void
log_quit(const char *fmt, ...)
{
	va_list		ap;

	va_start(ap, fmt);
	log_doit(0, LOG_ERR, fmt, ap);
	va_end(ap);
	exit(2);
}

/* Print a message and return to caller.
 * Caller specifies "errnoflag" and "priority". */

static void
log_doit(int errnoflag, int priority, const char *fmt, va_list ap)
{
	int		errno_save;
	char	buf[MAXLINE];

	errno_save = errno;		/* value caller might want printed */
	vsprintf(buf, fmt, ap);
	if (errnoflag)
		sprintf(buf+strlen(buf), ": %s", strerror(errno_save));
	strcat(buf, "\n");
	if (debug) {
		fflush(stdout);
		fputs(buf, stderr);
		fflush(stderr);
	} else
		syslog(priority, buf);
	return;
}

#endif /* _DEBUG */
#endif